MCQ Question on Differen renewable energy sources

 

1. How is OTEC caused?
a) By wind energy
b) By geothermal energy
c) By solar energy
d) By gravitational force
View Answer

Answer: c
Explanation: OTEC is caused by solar energy indirectly. Of late harnessing tidal and wave energy has gained momentum. While OTEC has its own limitations, wave and tidal energy conversion systems can generate more energy when compared to solar energy.

2. What does OTEC stand for?
a) Ocean thermal energy cultivation
b) Ocean thermal energy conversion
c) Ocean techno energy conservation
d) Ocean thermal energy consumption
View Answer

Answer: b
Explanation: Ocean thermal energy conversion (OTEC) uses the temperature difference between cooler deep and warmer shallow or surface sea water to run a heat engine and produce useful work, usually in the form of electricity. OTEC can operate with a very high capacity factor and so can operate in base mode.

3. Which country has world’s largest tidal power plant?
a) Netherlands
b) South Korea
c) Laos
d) Bolivia
View Answer

Answer: b
Explanation: Sihwa Lake Tidal Power Station is the world’s largest tidal power installation, with a total power output capacity of 254 MW. When completed in 2011, it surpassed the 240 MW Rance Tidal Power Station which was the world’s largest for 45 years. It is operated by the Korea Water Resources Corporation.

4. Which type of turbine is commonly used in tidal energy?
a) Francis turbine
b) Kaplan turbine
c) Pelton wheel
d) Gorlov turbine
View Answer

Answer: b
Explanation: The Kaplan turbine is a propeller type reaction turbine that is usually immersed completely in the fluid it derives energy from. A Kaplan turbine is beneficial in that it is able to operate in lower pressure situations where Pelton or Francis turbines cannot.

5. How is water trapped from coastal waters?
a) By building canals
b) By building dams
c) By digging wells
d) By storing in tanks
View Answer

Answer: b
Explanation: The tides are one of the sources of energy from the oceans. This energy can be tapped from coastal waters by building dams. Dams entrap the water at high tide and release it at low tide back to the sea.

6. Water to the turbine is allowed through the __________
a) Pipes
b) Sluice gates
c) Canals
d) Pumps
View Answer

Answer: b
Explanation: A sluice is a water channel controlled at its head by a gate. A sluice gate is traditionally a wood or metal barrier sliding in grooves that are set in the sides of the waterway. Sluice gates commonly control water levels and flow rates in rivers and canals.

7. The tides are rhythmic and constant.
a) True
b) False
View Answer

Answer: b
Explanation: The tides are rhythmic but not constant. They do not occur on a regular daily schedule. Their occurrence is due to balance of forces, mainly the gravitational force of the moon but also that of the sun, both acting together with that of earth to balance the centrifugal force on the water to the earth’s rotation.

8. For exactly how much time does it take for one tidal cycle?
a) 22h, 20min
b) 24h, 50min
c) 20h, 10min
d) 22h, 50min
View Answer

Answer: b
Explanation: It takes the Earth an extra 50 minutes to catch up to the moon. Since the Earth rotates through two tidal bulges every lunar day, we experience two high and two low tides every 24 hours and 50 minutes. Here, we see the relationship between the tidal cycle and the lunar day.

9. What type of tide is it if the difference between high and low tide is greatest?
a) Diurnal tide
b) Neap tide
c) Spring tide
d) Ebb tide
View Answer

Answer: c
Explanation: The tide that occurs when the difference between high and low tides is greatest. It occurs when the moon is new or full. Spring tides result when the gravitation forces of the sun and moon are parallel to one another.

10. A tide whose difference between high and low tides is least is called as __________
a) Diurnal tide
b) Neap tide
c) Spring tide
d) Ebb tide
View Answer

Answer: b
Explanation: A tide that occurs when the difference between high tide and low tide is the least. Neap tides occur when gravitational forces from the sun and moon are at right angles (perpendicular) to one another.

11. Which of the turbine can be mounted vertically and horizontally?
a) Pelton wheel
b) Kaplan turbine
c) Gorlov turbine
d) Francis turbine
View Answer

Answer: c
Explanation: The Gorlov helical turbine (GHT) is a water turbine evolved from Darrieus turbine design by altering it to have helical blades/foils. Gorlov turbine can be mounted both vertically and horizontally because it is not directional.

12. What types of tides occur when there is so much interference with continents?
a) Diurnal tide
b) Neap tide
c) Spring tide
d) Ebb tide
View Answer

Answer: a
Explanation: Diurnal tides occur when there is so much interference by continents, only one high tide and one low tide occur per day. This diurnal tide has a period of 24 hrs and 50 min. An area has a diurnal tidal cycle if it experiences one high and one low tide every lunar day.

 

WAVE ENERGY Questions

13. Kinetic energy that results from the oscillation of water is called ________
a) Wave energy
b) Tidal energy
c) Ocean thermal energy
d) Hydro energy
View Answer

Answer: a
Explanation: Kinetic energy that results from the oscillation of water is called wave energy. Wave energy is derived from wind energy, which derives in turn from solar energy. Wave energy can be much more concentrated than the solar energy.

14. How is height of wave determined?
a) By wind speed
b) By force of wave
c) By a immersion scale
d) By a floating device
View Answer

Answer: a
Explanation: Wave height is determined by wind speed, the duration of time the wind has been blowing, fetch and by the depth and topography of the seafloor. A given wind speed has a matching practical limit over which time or distance will not produce larger waves.

15. What does oscillatory motion at ocean produce?
a) Microseisms
b) Froth
c) Disturbance of currents
d) Currents
View Answer

Answer: a
Explanation: Oscillatory motion is highest at the surface and diminishes exponentially with depth. However, for near a reflecting coast, wave energy is also present as pressure oscillations at great depth, producing microseisms.

16. Waves are caused indirectly by ______
a) Wind energy
b) Solar energy
c) Geo-thermal energy
d) Wave energy
View Answer

Answer: b
Explanation: Like the wind and OTEC, ocean and sea waves are caused indirectly by solar energy. Waves are caused by the wind, which in turn is caused by the uneven solar heating and subsequent cooling of the earth’s crust and the rotation of the earth.

17. Select the correct formula of potential energy in wave energy?
a) PEA=14ρa2×ggc
b) PE = 14ρa2×ggc
c) APE=14ρa2×ggc
d) PEA=14ρa² × g
View Answer

Answer: a
Explanation: PEA=14ρa2×ggc is the correct formula for the potential energy of a wave.
g = gravitational acceleration, m/s²
g_c = conversion factor
ρ = water density
a = amplitude
A = λL in J/m².

18. Select the correct formula of kinetic energy of a wave?
a) KEA=14ρa2×ggc
b) KE = 14ρa2×ggc
c) KE = 14ρa2
d) KEA=14ρa2
View Answer

Answer: a
Explanation: The correct formula for kinetic energy of a wave is KEA=14ρa2×ggc.
g = gravitational acceleration, m/s²
g_c = conversion factor
ρ = water density
a = amplitude
A = λL in J/m².

19. What are used to reduce to reduce the motion of floats?
a) Back pressure
b) Tubes
c) Damping fins
d) Anchor
View Answer

Answer: c
Explanation: Damping fins are used to reduce the motion of the floats. The platform is stabilized within the water by four large underwater floatation tanks so that it is supported by the buoyancy forces. The floatation tank’s surfaces are wider in appearance and are flat.

20. From what material is the float (platform) made of _____________
a) Molded plastic
b) Thermocole
c) Stainless steel
d) Tubes
View Answer

Answer: a
Explanation: The platform is made of molded plastic with s foamed plastic core to arrive at the required density and strength. It is also called float since it floats on the water. And it is in shape of cylinder with wide and flat bottom surface.

21. A _______ attached to the float moves up and down inside a cylinder.
a) chain
b) barrel
c) piston
d) load
View Answer

Answer: c
Explanation: A piston attached to the float moves up and down inside a cylinder, fixed to the platform and is therefore relatively stationary. This piston cylinder arrangement is used as a reciprocating air compressor.

22. What type of energy is wave energy?
a) Non – conventional
b) Commercial
c) Non – renewable
d) Exhaustible
View Answer

Answer: a
Explanation: Wave energy is free and non-conventional source of energy. Harnessing of energy by this method is relatively pollution free and because they remove energy from the waves, leaves the water in a relatively placid state in their wakes.

23. What is major disadvantage of wave energy?
a) It is not efficient enough
b) It is available only in ocean
c) The harnessing cost is more
d) Unstable during high wind pressures
View Answer

Answer: b
Explanation: The major disadvantage of wave energy is that the energy is available on the ocean. The extraction equipment must be operated in a marine environment with all that implies in terms of maintenance, construction cost, life time and reliability.

24. Motion of water in a wave is primarily ________
a) Vertical
b) Horizontal
c) Linear
d) Opposite
View Answer

Answer: a
Explanation: Wave motion is primarily horizontal but the motion of the water is vertical. Mechanical power is obtained by floats making use of the motion of water. The concept visualizes a large force that is driven up and down by the water within relatively stationary guides.

25. How many number of manifolds are part of a platform of floating device?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: d
Explanation: There are four manifolds that are part of a platform. There are four large under water floatation tanks which stabilize the platform. Platform is supported by buoyancy forces and no vertical or horizontal displacement occurs due to wave action.

26. Which device uses the float which has two motions?
a) High level reservoir wave machine
b) Dolphin type wave generator
c) Hydraulic accumulator
d) Float wave power conversion device
View Answer

Answer: b
Explanation: Dolphin type uses the float which has two motions. The first is a rolling motion about its own fulcrum with the connecting rod. Revolving movements are caused between the float and the connecting road. The other is nearly vertical or heaving motion about the connecting rod fulcrum.

27. In which wave machine instead of compressing air, the water itself is pressurized?
a) High level reservoir wave machine
b) Dolphin type wave generator
c) Hydraulic accumulator
d) Float wave power conversion device
View Answer

Answer: c
Explanation: Hydraulic accumulator wave machines, instead of compressing air, the water itself is pressurized and stored in a high pressure accumulator or pumped to a high level reservoir, from which it flows through a water turbine electric generator.

 

OCEAN THERMAL ENERGY QUESTION

1. Which is the type of energy where the energy is harnessed by the heat accumulated on the surface of water?
a) Wind energy
b) Wave energy
c) Ocean thermal energy conversion
d) Solar energy
View Answer

Answer: c
Explanation: Absorption of heat from the sun by the seas and oceans, solar radiation causes ocean currents and moderate temperature gradients from the water surface downward especially in tropical waters.

2. Water _________ decreases with an increase in temperature.
a) volume
b) density
c) pressure
d) force
View Answer

Answer: b
Explanation: Water density decreases with an increase in temperature. Thus, there will be no thermal convection currents between the warmer, lighter water at the top and the deep cooler, heavier water. Thermal conduction heat transfer between them, across the large depths, is too low and thus mixing is retarded, so the warm water stays at the top and cool water stays at the bottom.

3. How many essentially infinite heat reservoirs are present in tropical waters?
a) 1
b) 2
c) 3
d) 4
View Answer

Answer: b
Explanation: In tropical waters, there are two essentially infinite heat reservoirs, a heat source at the surface at about 27^oC and heat sink some 1 Km directly below, at about 4^oC, both reservoirs are maintained by solar incidence.

4. Who first recognized the OTEC?
a) d’Arsonval
b) Alexander Edmond Becquerel
c) James Prescott joule
d) LA Rance
View Answer

Answer: a
Explanation: The concept of ocean temperature energy conversion is based on the utilization of temperature difference in a heat engine to generate power. It was first recognized by Frenchman d’Arsonval in the year 1881.

5. From which cycle does maximum possible efficiency of a heat engine operating between two temperature limits cannot exceed?
a) Carnot cycle
b) Otto cycle
c) Open cycle
d) Anderson cycle
View Answer

Answer: a
Explanation: The maximum possible efficiency of a heat engine operating between two temperature limits cannot exceed that of a Carnot cycle operating between the same temperature limits. The Carnot efficiency is given by
η_c = (T₁-T₂)/T₁.

6. Which of the following has the lowest efficiency?
a) Solar energy
b) Wind energy
c) Wave energy
d) OTEC
View Answer

Answer: d
Explanation: OTEC power generation gives less efficiency. However, because of the OTEC requirement for parasitic power and other losses, the achievable net conversion efficiencies of 30 to 40% associated with conventional power plants.

7. The Claude cycle is also called as __________
a) Open cycle
b) Anderson cycle
c) Closed cycle
d) Otto cycle
View Answer

Answer: a
Explanation: A Claude cycle is also called as open cycle in which sea water itself plays, the multiple role of heat source, working fluid and heat sink. In this cycle warm water at 27°C is admitted into an evaporator in which the pressure is maintained at a value slightly below the saturation pressure corresponding to that of water temperature.

8. Anderson cycle is also known as _________
a) Open cycle
b) Claude cycle
c) Closed cycle
d) Otto cycle
View Answer

Answer: c
Explanation: Anderson cycle is also called as closed cycle. Closed cycle utilizes the oceans warm surface and cool deep waters heat source and sink respectively, but requires a separate working fluid that receives and rejects heat to the source and sink via heat exchanges.

9. Who proposed closed cycle approach?
a) Barjot
b) Alexander Edmond Becquerel
c) James Prescott joule
d) LA Rance
View Answer

Answer: a
Explanation: The closed cycle approach was first proposed by Bajrot in 1926, but the most recent design was by Anderson in 1960s. The closed cycle is sometimes referred to as Anderson cycle. The Anderson cycle chose Propane as working fluid.

10. The working fluid chosen by Anderson OTEC cycle is ______
a) Propane
b) Water
c) Engine oil
d) ISO-butane
View Answer

Answer: a
Explanation: The working fluid chosen by Anderson OTEC cycle is propane. The operating pressures of such fluid at the boiler condenser temperatures are much higher than those of water being roughly 10 bars at the boiler, and their specific volumes are much lower, being comparable to those of steam in conventional power plants.

11. Which is the working fluid in open cycle?
a) Propane
b) Water
c) Engine oil
d) ISO-butane
View Answer

Answer: b
Explanation: In the open/Claude cycle, water is the working fluid. The warm water surface water is caused to boil by lowering the pressure, without supplying any additional heat. The low pressure steam produced then, drive’s the turbine and the exhaust steam is condensed by the deep colder water is discarded.

12. A continuous movement of water in specific direction is called as _________
a) float
b) waves
c) current
d) tides
View Answer

Answer: d
Explanation: Water currents can be found in streams, rivers and oceans throughout the world. Water current is the rate of movement in the water, and ways to describe water current include its speed and direction. There are different types of water currents which behave in different ways because they are affected by separate variables.

 

GEO THERMAL ENERGY SOURCES

1. The process of producing energy by utilizing heat trapped inside the earth surface is called _________
a) Hydrothermal energy
b) Geo-Thermal energy
c) Solar energy
d) Wave energy
View Answer

Answer: b
Explanation: The process of producing energy by utilizing heat trapped inside the earth surface is called Geo thermal energy. Energy present as heat in the earth’s crust. The more readily accessible heat in the upper most (10 km) or so, of the crust constitutes a potentially useful and almost inexhaustible source of energy.

2. How much is the average temperature at depth of 10 km of earth surface?
a) 200^oC
b) 900^oC
c) 650^oC
d) 20^oC
View Answer

Answer: a
Explanation: The heat is apparent from the increase in temperature of the earth with increasing depth below the surface. Although higher and lower temperature occurs, the average temperature at depth of 10 km is about 200^oC.

3. What is hot molten rock called?
a) Lava
b) Magma
c) Igneous rocks
d) Volcano
View Answer

Answer: b
Explanation: Magma is a mixture of molten or semi-molten rock, volatiles and solid that is found beneath the surface of the Earth, and is expected to exist on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals, dissolved gas and sometimes gas bubbles.

4. How many kinds of Geo thermal steams are there?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: a
Explanation: There are two kinds of geo thermal steams, the one that originates from the magma is called magmatic steam and that from ground water heated by magma is called meteoritic steam. The latter is the largest source of geothermal steam.

5. What does EGS stand for in geothermal energy?
a) Engraved Geothermal systems
b) Enhanced geothermal system
c) Exhaust gas system
d) Engineered geo physical system
View Answer

Answer: b
Explanation: The development of a geothermal system where hydraulic fracturing of the system can allow the production at a commercial level. EGS’s are engineered reservoirs created where there is geothermal energy but a lack of permeability. Fluid is injected into the earth‘s surface which causes pre-existing fractures to open again, creating permeability. Nationwide potential with engineered reservoirs 6-km to 8-km deep.

6. Who invented first geothermal plant?
a) Michael Faraday
b) Piero Ginori Conti
c) Enrico Fermi
d) Guglielmo Marconi
View Answer

Answer: b
Explanation: In 1904, Italian scientist Piero Ginori Conti invented the first geothermal electric power plant in which steam was used to generate the power. On 4 July 1904, at Larderello, Piero Ginori Conti powered five bulbs from a dynamo driven by a reciprocating steam engine using geothermal energy.

7. A geothermal solution containing appreciable amounts of sodium chloride or other salts is called as __________
a) Fluids
b) Brine
c) Solvent
d) Magma
View Answer

Answer: b
Explanation: Brine is a high-concentration solution of salt (usually sodium chloride) in water. In different contexts, brine may refer to salt solutions ranging from about 3.5% (a typical concentration of seawater, on the lower end of solutions used for brining foods) up to about 26% (a typical saturated solution, depending on temperature).

8. Earth’s outer layer rock is called as __________
a) Mantle
b) Crust
c) Outer core
d) Asthenosphere
View Answer

Answer: b
Explanation: Earth’s crust is Earth’s hard outer layer. It is less than 1% of Earth’s volume. The crust is made up of different types of rocks: igneous, metamorphic, and sedimentary rocks. Crust is also called as lithosphere.

9. The hole on earth’s surface from where the steam from the earth comes out is called as ________
a) Gash
b) Mud pot
c) Void
d) Fumarole
View Answer

Answer: d
Explanation: A fumarole is an opening in a planet’s crust, often in areas surrounding volcanoes, which emits steam and gases such as carbon dioxide, sulfur dioxide, hydrogen chloride, and hydrogen sulfide. The steam forms when superheated water condenses as its pressure drops when it emerges from the ground.

10. A spring that shoots jets of hot water and steam into the air is called as _______
a) Mine hole
b) Geyser
c) Hot spring
d) Mud pot
View Answer

Answer: b
Explanation: Geysers are temporary geological features. Geysers are generally associated with volcanic areas. As the water boils, the resulting pressure forces a superheated column of steam and water to the surface through the geyser’s internal plumbing.

11. Which kind geothermal plant is most common type?
a) Dry steam
b) Flash
c) Binary
d) Wet steam
View Answer

Answer: b
Explanation: Flash Steam Power Plants are the most common form of geothermal power plant. The hot water is pumped under great pressure to the surface. When it reaches the surface the pressure is reduced and as a result some of the water changes to steam. This produces a ‘blast’ of steam. The cooled water is returned to the reservoir to be heated by geothermal rocks again.

12. How much is the efficiency of geothermal plant?
a) 28%
b) 15%
c) 42%
d) 30%
View Answer

Answer: b
Explanation: Geothermal power plants have lower efficiency relative to other thermal power plants, such as coal, natural gas, oil, and nuclear power stations. It is commonly assumed that only 15% of the energy from the produced geothermal fluid can be converted to electricity.

 

 

 

HYDRO THERMAL SYSTEMS

1. What is range of temperature at Hydro thermal reservoirs?
a) 350^oC
b) 210^oC
c) 50^oC
d) 1900^oC
View Answer

Answer: a
Explanation: Hydrothermal resources are wet reservoirs at moderate depths containing steam and hot water under pressure at temperatures upto about 350^oC. These systems are further subdivided depending upon whether steam or hot water is dominant product.

2. When do hydrothermal resources arise?
a) When the movement of tectonic plates occurs
b) When the area is prone to volcanic eruptions
c) When water has access to high temperature
d) When temperature on earth surface is very high
View Answer

Answer: c
Explanation: Hydrothermal resources arise when water has access to high temperature rocks, this account for the description as HYDROTHERMAL. The heat is transported from the hot rocks by circulating movement.

3. How does the hot water or steam escape through earth surface?
a) Through fissures
b) Through Pot holes
c) From Wells
d) Through water bodies
View Answer

Answer: a
Explanation: Hot water or steam often escapes through fissures in the rock, thus forming hot springs, geysers fumaroles etc. in order to utilize the hydrothermal energy, wells are drilled either to intercept a fissure or more commonly into the formation containing the water.

4. What is the range of depth of most Hydro thermal wells?
a) 600 – 2100m
b) 50 – 60 m
c) 8 – 10 km
d) 1200 – 5400m
View Answer

Answer: a
Explanation: Most hydrothermal wells range in the depth from about 600 to 2100 m, although there are some shallower and deeper production wells. As already mentioned for practical purposes hydrothermal resources are further subdivided into vapor dominated and liquid dominated types.

5. How the steam after passing turbine is cooled down in the geo thermal energy plant?
a) Water cooled
b) Cooling towers
c) Air cooled (Blowers/ air vents)
d) Chemically cooled
View Answer

Answer: b
Explanation: A direct system is used at the geysers in which the turbine exhaust steam is condensed by direct contact with cooling water. The resulting warm water is circulated through a mechanical draft cooling tower and returned to the condenser.

6. How much percent of Non-condensable gases are contained in steam?
a) 0.5 – 5%
b) 10 – 25%
c) 75 – 85%
d) 50%
View Answer

Answer: a
Explanation: The steam contains 0.5 – 5% by weight of non-condensable gases which appear in the turbine exhaust. These gases consist mainly of carbon dioxide with small amounts of methane and ammonia, which are largely harmless in the quantities present.

7. The withdrawal of large amounts of steam from a hydrothermal reservoir may result in ____________
a) landslides
b) surface subsidence
c) light surface
d) loss of land fertility
View Answer

Answer: b
Explanation: The withdrawal of large amounts of steam from a hydrothermal reservoir may result in surface subsidence. Such subsidences have sometimes occurred in oil fields and are dealt with injecting water into the ground.

8. What is the range of range of the water, which comes from degrees of salinity?
a) 300 – 8000 ppm
b) 4500 – 50,000 ppm
c) 70000 – 85000 ppm
d) 3000 – 280,000 ppm
View Answer

Answer: d
Explanation: The water comes with various degrees of salinity, ranging from 3000 to 280,000 ppm of dissolved solids, and at various temperatures. There are, therefore, various systems for converting liquid dominated system into useful work that depend upon these variables.

9. Which among the following systems is used for water in high temperature range?
a) Vapor dominated systems
b) Flashed steam system
c) Liquid dominated total flow concept
d) Petro thermal systems
View Answer

Answer: b
Explanation: Flashed steam system is used for water in the higher temperature range. Flash steam is low-pressure steam created when hot water is released from a high pressure to a lower pressure within a steam system.

10. Which geothermal systems are composed of hot dry rock (HDR) but no underground water?
a) Hybrid geothermal Fossil system
b) Flashed steam system
c) Liquid dominated total flow concept
d) Petro thermal systems
View Answer

Answer: d
Explanation: Petro thermal systems are composed of hot dry rock (HDR) but no underground water. They are largest geothermal resource available. The rock occurring at moderate depths has very low permeability and needs to be increasing its heat transfer surface.

11. Which geothermal system utilizes relatively low temperature heat of geothermal sources?
a) Hybrid geothermal Fossil system
b) Flashed steam system
c) Liquid dominated total flow concept
d) Petro thermal systems
View Answer

Answer: a
Explanation: The hybrid geothermal fossil fuel systems utilizes the relatively low temperature heat of geothermal sources in the low temperature end of a conventional cycle and the high temperature heat from fossil fuel combustion in the high temperature cycle with a natural source of heat for part of heat addition, thus reducing the consumption if the expensive and non renewable fossil fuels.

12. How many possible arrangements are there for Hybrid geothermal plants?
a) 2
b) 3
c) 4
d) 5
View Answer

Answer: a
Explanation: There are two possible arrangements for hybrid plants. These are (1) geothermal preheat suitable for low temperature liquid dominated systems, and (2) fossil superheat, suitable for vapour dominated and high temperature liquid dominated systems.

 

HYDROGEN AND STORAGE – FUEL CELL SYSTEMS

1. Fuel cell converts chemical energy to electrical energy using a reaction that __________
a) eliminates combustion of fuel
b) requires combustion of fuel
c) requires no ignition of fuel
d) fuel is not required
View Answer

Answer: a
Explanation: Combustion of fuel is eliminated in fuel cells.

2. Fuel cell performance is not limited by __________
a) First law of Thermodynamics
b) Second law of Thermodynamics
c) Third law of Thermodynamics
d) All three laws are applicable
View Answer

Answer: b
Explanation: The performance of fuel cell is not limited by the Second law of Thermodynamics.

3. For which of these devices does negative charge carriers flow from anode to cathode in the external circuit?
a) MHD generator
b) Thermionic generator
c) Thermoelectric generator
d) Fuel cell
View Answer

Answer: d
Explanation: The sign convention of anode and cathode is same for fuel cell and batteries.

4. The fuel cell is considered a battery in which ___________ is continuously replaced.
a) fuel only
b) oxidizer
c) both fuel and oxidizer
d) none of the mentioned
View Answer

Answer: c
Explanation: Both fuel and oxidizer is replaced in fuel cell.

5. The type of reactions in a fuel cell is not determined by __________
a) fuel and oxidizer combination
b) composition of electrolyte
c) materials of anode and cathode
d) catalytic effects of reaction container
View Answer

Answer: d
Explanation: The catalytic effects of electrodes rather than that of reaction container effects the fuel cell reactions.

6. What is the voltage output of hydrogen-oxygen fuel cell?(in V)
a) -1.23
b) -1.45
c) -1.01
d) -.93
View Answer

Answer: a
Explanation: The voltage output of hydrogen-oxygen fuel cell is -1.23V.

7. What is the voltage output of carbon-oxygen fuel cell?(in V)
a) -.91
b) -1.24
c) -1.02
d) -1.17
View Answer

Answer: c
Explanation: The voltage output of carbon-oxygen fuel cell is -1.02V.

8. What is the voltage output of methane-oxygen fuel cell?(in V)
a) -1.16
b) -1.06
c) -1.26
d) -0.96
View Answer

Answer: b
Explanation: The voltage output of methane-oxygen fuel cell is -1.06V.

9. Which of these gases or liquids are not used as source of hydrogen in fuel cells?
a) C₂H₆
b) C₂H₂
c) C₆H₆
d) C₂H₅OH
View Answer

Answer: d
Explanation: The only liquid from alcohol series used as a source of hydrogen in fuel cells is methanol CH3OH.

10. The hydrocarbons cracked with steam in fuel cells do not give rise to __________
a) CO
b) CO₂
c) H₂
d) H₂O
View Answer

Answer: d
Explanation: The cracking of fuel in fuel cells foes not give rise to H₂O.

11. Which of these should not be a properties of fuel cell electrodes?
a) good electrical conductors
b) highly resistant to corrosive environment
c) should perform charge seperation
d) take part in chemical reactions
View Answer

Answer: d
Explanation: The fuel cell electrode should not take part in fuel cell electrode.

12. Which of these fuel cell operates at temperature below 100.C?
a) phosphoric fuel cell
b) solid polymer electrolyte fuel cell
c) molten carbon fuel cell
d) hydrogen-oxygen fuel cell
View Answer

Answer: c
Explanation: The Solid Polymer Electrolyte Fuel Cell operates at temperatures less than 100.C.

13. Which of these fuel cells operates at high temperatures and pressures?
a) high temperature solid oxide fuel cell
b) alkaline fuel cell
c) molten carbon fuel cell
d) phosphoric acid fuel cell
View Answer

Answer: c
Explanation: The Molten Carbon Fuel Cell operates at high temperatures and pressures.