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Multiple choice question for engineering

Set 1

1.Which of these is not a major direct energy conversion device?
a) magnetohydrodynamic
b) thermionic
c) geothermal
d) fuel cell

View Answer

Answer: c [Reason:] Geothermal energy is not available everywhere.

2.Which of these is the most promising power generation system?
a) magnetohydrodynamic
b) thermoelectric
c) hydrogen
d) fuel cell

View Answer

Answer: a [Reason:] Since it is capable of tapping vast potential of modern furnaces.

3. Which of these is not a limitation of conventional energy sources?
a) Resources are limited some are seasonal
b) Most of them emit harmful gases contributing to global warming
c) Situated in remote areas and higher T and D losses
d) requires small areas

View Answer

Answer: d [Reason:] Conventional energy resources require large areas.

4. Which of these is a conventional source of energy?
a) sun
b) wind
c) fossil fuels
d) fuel cells

View Answer

Answer: c [Reason:] Fossil fuels are conventional sources of energy.

5. Which of these is a non-conventional type of power generation without prime movers?
a) hydro power
b) thermal
c) nuclear
d) thermoelectric

View Answer

Answer: d [Reason:] Thermoelectric power generation of a non conventional type.

6. Which of these is not a type of collector in solar power generation?
a) flat plate
b) focusing or concentrating collectors
c) cylindrical parabolic concentrator
d) hyperbolic concentrator

View Answer

Answer: d [Reason:] The shape is not hyperbolic but parabolic.

7. Which of these is not a merit of tidal power generation?
a) free from problems of ecology balance
b) everlasting
c) no extra submerging of land is required
d) uneven operation

View Answer

Answer: d [Reason:] The uneven operation is a demerit of tidal power.

8. Which of these is not an effect of distributed generation system on power generation?
a) affects over power generation setting
b) effect in auto reclosing
c) creation of ferro resonance
d) protection from insulation failure

View Answer

Answer: d [Reason:] Distributed generation system actually causes insulation failure.

9. Which of these is not a component of natural gas?
a) methanol
b) methane
c) ethane
d) propane

View Answer

Answer: a [Reason:] Methanol is not a component of natural gas.

Set 2

1. In an open cycle MHD-steam power plant, the temperature at the entrance of MHD duct is (in K)
a) 2500-3000
b) 2000-2500
c) 1500-2000
d) 2250

View Answer

Answer: a [Reason:] The temperature is kept in between 2500-3000K.

2. The air at the entrance of MHD duct is seeded with potasium upto
a) 7%
b) 5%
c) 3%
d) 1%

View Answer

Answer: d [Reason:] The air is seeded upto 1%/.

3. Air pollution in an MHD-steam power plant is caused due to the formation of which of the following compounds?
a) oxides and hydroxides
b) chlorides and hydroxides
c) oxides and carbonates
d) carbonates and bicarbonates

View Answer

Answer: a [Reason:] Oxides and hydroxides of seeding element formed cause air pollution.

4. Which of the following device helps in recovery of seeding element?
a) ion precipitator
b) condenser
c) electrostatic precipitator
d) orsat’s apparatus

View Answer

Answer: c [Reason:] Electrostatic precipitator helps in recovery of the seed.

5. In closed cycle MHD-steam power plant, which of the following gas is seeded in the MHD duct?
a) helium
b) xenon
c) sodium vapour
d) chlorine

View Answer

Answer: a [Reason:] Helium is seeded in the air.

6. Where is the input of the MHD duct heated in a closed cycle MHD-steam power plant?
a) blast furnace
b) nuclear reactor
c) reverabatory furnace
d) combustion chamber

View Answer

Answer: b [Reason:] The seed is heated in the nuclear reactor.

7. Which of these materials not used for MHD duct walls?
a) magnesium oxide
b) strontium zirconate
c) hafnia
d) manganese zirconate

View Answer

Answer: a [Reason:] The other three materials are used for MHD duct walls.

8. To reduce the power consumption of electromagnets, which type of coils have been suggested?
a) cryogenic
b) high temperature resistant
c) superconducting
d) aluminium

View Answer

Answer: a & c [Reason:] Cryogenic or superconductiong coils have been suggested for reducing power consumption of electromagnets.

9. Which is the only fuel better than coal for use?
a) natural gas
b) char
c) kerosene
d) benzene

View Answer

Answer: b [Reason:] Char is a better fuel than coal since it has less hydrogen and increases performance by 25%.

10. Which of these is not a property of MHD power generation?
a) has no moving part, so is reliable
b) overall generation cost is less
c) closed cycle has almost no pollution
d) conversion is about 80-90%

View Answer

Answer: d [Reason:] The overall efficiency of MHD generation is 50-60%.

Set 3

1. Which of the following may be used to measure the rate of nuclear disintegration?
a) Geiger-Muller Counter
b) Cold Chamber
c) Cyclotron
d) Van De Graph Generator

View Answer

Answer: a [Reason:] Geiger-Muller Counter is used to measure the rate of nuclear disintegration.

2. The second underground nuclear test was conducted by India at
a) Pokhran
b) Narora
c) Jaisalmer
d) Kalpakkam

View Answer

Answer: a [Reason:] Pokhran was the place where the second underground nuclear test was conducted by India.

3. Which of the following may not need a moderator?
a) Candu Reactor
b) Fast Breeder Reactor
c) Homogeneous Reactor
d) none of the mentioned

View Answer

Answer: b [Reason:] Fast Breeder Reactor may not need a moderator.

4. The mass number of an element is not changed, when it emits __________ radiations.
a) α & γ
b) α, β, & γ
c) α & β
d) β & γ

View Answer

Answer: d [Reason:] The mass number of an element is not changed, when it emits β & γ radiations.

5. Which of the following is not a naturally occurring nuclear fuel?
a) Uranium-238
b) Thorium-233
c) Plutonium-239
d) none of the mentioned

View Answer

Answer: c [Reason:] Plutonium-239 is an artificial nuclear fuel.

6. Which is the most commonly used molten metal for cooling of nuclear reactors?
a) Zinc
b) Sulphur
c) Sodium
d) Manganese

View Answer

Answer: c [Reason:] Sodium is the most commonly used molten metal for cooling of nuclear reactors.

7. One amu is equivalent to?
a) 931 MeV
b) 93.1 eV
c) 9.31 eV
d) 931 J

View Answer

Answer: a [Reason:] 91 MeV constitutes one amu.

8. Fast breeder reactors do not
a) use molten sodium as coolant
b) use fast neutrons for fission
c) use Th-232 as fissile fuel
d) convert fertile material to fissile material

View Answer

Answer: c [Reason:] Fast breeder reactors do not use Thorium-232 as fuel.

9. A boiling water reactor is the one, in which the
a) pressurised water is pumped into the core.
b) coolant water, after being heated in the reactor core, generates steam in a boiler
c) fuel and the coolant are thoroughly mixed to form a homogeneous solution
d) coolant water is allowed to boil in the core of the reactor

View Answer

Answer: d [Reason:] A boiling water reactor is the one, in which the coolant water is allowed to boil in the core of the reactor.

10. Commercial power generation from fusion reactor is not yet possible, because
a) it is difficult to initiate fusion reaction
b) the fuel required (e.g. deuterium and tritium) is scarce
c) it is difficult to control fusion reaction
d) quantity of fuel required for initiating fusion reaction is prohibitively high

View Answer

Answer: c [Reason:] As fission reactions are hard to be controlled, the commercial power generation is not yet possible.

11. Which is a fertile nuclear fuel?
a) U-233
b) U-235
c) Pu-239
d) Th-232

View Answer

Answer: d [Reason:] Th-232 is the only fertile nuclear fuel amongst all the mentioned nuclear fuel.

12. Thermal shield is used in high powered nuclear reactors to
a) absorb the fast neutrons
b) protect the walls of the reactor from radiation damage
c) slow down the secondary neutrons
d) protect the fuel element from coming in contact with the coolant

View Answer

Answer: b [Reason:] Thermal shield is used in high powered nuclear reactors to protect the walls of the reactor from radiation damage.

Set 4

1. Mean Temperature of Heat Addition is the ratio of?
a) Difference of temperatures to difference of entropies
b) Difference of enthalpies to difference of entropies
c) Difference of temperatures to difference of enthalpies
d) Difference of entropies to difference of enthalpies.

View Answer

Answer: b [Reason:] The formula for Mean Temperature of Heat Addition is given by, Tml = (h1 – h4)/(s1 – s4).

2. If T2 is the temperature of heat rejection, Tml is the mean temperature of heat addition, the efficiency n of a Rankine Cycle is given by which of the expressions?
a) n = 1-(T2/Tml)
b) n = 1+(T2/Tml)
c) n = (T2/Tml)
d) n = 1/(T2/Tml)

View Answer

Answer: a [Reason:] The expression for the efficiency of a Rankine Cycle is given as, n = 1-(T2/Tml).

3. The saturation pressure corresponding to the minimum practicable temperature of heat rejection is a function of?
a) Temperature of heat rejection
b) Temperature of surroundings
c) Mean temperature of heat addition
d) None of the mentioned

View Answer

Answer: c [Reason:] The relation between saturation pressure & mean temperature of heat addition is given by, EfficiencyRankine = f(Tml) where, Tml = Mean temperature of heat addition.

4. What is the effect of the increase in the superheat at constant pressure?
a) Decreases cycle efficiency
b) Increases mean temperature of heat addition
c) Decreases mean temperature of heat addition
d) None of the mentioned

View Answer

Answer: b [Reason:] As there is an increase in superheat at constant pressure, the cycle efficiency increases & hence there is an increase in the mean temperature of heat addition.

5. PWR stands for?
a) Pressurized Water Relator
b) Pressurized Water Reheater
c) Pressurized Water Reactor
d) Pressurized Water Refractory

View Answer

Answer: c [Reason:] PWR stands for Pressurized Water Reactor which does not use Superheat.

6. The maximum temperature of steam that can be used is fixed from metallurgical considerations. This temperature limit is called?
a) Mining Limit
b) Metallurgical Limit
c) Metallic Limit
d) None of the mentioned

View Answer

Answer: b [Reason:] ‘Metallurgical Limit’ is defined as the lowest temperature limit of usable steam fixed by metallurgical considerations.

7. Most of the turbine expansion takes place in?
a) Liquid Region
b) Solid Region
c) Vapour Region
d) Plastic Region

View Answer

Answer: c [Reason:] Most of the turbine expansion should take place in the vapour region, so as to increase the life of the blades of the turbine.

8. Pelton Wheel Turbine is suited for?
a) high heads
b) low heads
c) medium heads
d) zero heads

View Answer

Answer: a [Reason:] A Pelton wheel turbine is based on the principle of changing Kinetic Energy of fluid into output work.

9. A Hydraulic Ram Pump is based on the principle of?
a) Wind Hammer
b) Water hammer
c) Wind gushing
d) None of the mentioned

View Answer

Answer: b [Reason:] A Hydraulic Ram Pump is based on the principle of Water Hammer. This principle states that, “When a flowing fluid is stopped suddenly, the kinetic energy of the rapidly moving fluid decreases to zero & in turn, increases the pressure which pulls the fluid to high heads.

10. Which of the following diagrams are used while analyzing the effect of superheat & Inlet Pressure on mean temperature of heat addition?
a) P-V diagram
b) T-S diagram
c) P-T diagram
d) V-T diagram

View Answer

Answer: b [Reason:] Using the T-S diagram gives us an overview as to where a particular process occurs, i.e., it is within the solid region, the gaseous region or the vapour region. So, here, we prefer T-S diagram for analysis process.

11. Which of these constitute a Carnot Cycle?
a) 2 reversible isotherms & 2 reversible adiabatics
b) 1 reversible isotherms & 2 reversible adiabatics
c) 2 reversible isotherms & 1 reversible adiabatics
d) 1 reversible isotherms & 2 reversible adiabatics

View Answer

Answer: a [Reason:] A combination of 2 reversible isotherms & 2 reversible adiabatics gives a Carnot Cycle (from the P-V diagram).

12. Work input and work outputs are given & obtained in?
a) 2 reversible adiabatics
b) 2 reversible isotherms
c) 1 reversible isotherm & 1 reversible adiabatic
d) 2 reversible isotherms & 1 reversible adiabatic

View Answer

Answer: a [Reason:] The work input & output are both in the 2 reversible adiabatics (from the P-V diagram).

13. Heat input & output is obtained in?
a) 2 reversible adiabatics
b) 2 reversible isotherms
c) 1 reversible isotherm & 1 reversible adiabatic
d) 2 reversible isotherms & 1 reversible adiabatic

View Answer

Answer: b [Reason:] The heat inputs & outputs are in 2 reversible isotherms (from the P-V diagram).

14. The elements of a Carnot heat engine are?
a) Heat Exchangers, Turbine, Pump
b) Heat Exchangers, Turbine, Evaporator
c) Heat Exchangers, Turbine, Condenser
d) Heat Exchangers, Turbine, Superheater

View Answer

Answer: a [Reason:] There are 2 heat exchangers, a turbine & a pump in a Carnot heat engine.

15. Which of these shouldn’t be there in the pipelines of working fluid for achieving the conditions of Carnot Cycle?
a) Heat Transfer
b) Insulation
c) Lubrication
d) Zero Friction

View Answer

Answer: a [Reason:] Heat Transfer & Friction are the factors affecting the conditions of a Carnot Cycle.

Set 5

1. Mean Temperature of Heat Addition is the ratio of?
a) Difference of temperatures to difference of entropies
b) Difference of enthalpies to difference of entropies
c) Difference of temperatures to difference of enthalpies
d) Difference of entropies to difference of enthalpies.

View Answer

Answer: b [Reason:] The formula for Mean Temperature of Heat Addition is given by, Tml = (h1 – h4)/(s1 – s4).

2. If T2 is the temperature of heat rejection, Tml is the mean temperature of heat addition, the efficiency n of a Rankine Cycle is given by which of the expressions?
a) n = 1-(T2/Tml)
b) n = 1+(T2/Tml)
c) n = (T2/Tml)
d) n = 1/(T2/Tml)

View Answer

Answer: a [Reason:] The expression for the efficiency of a Rankine Cycle is given as, n = 1-(T2/Tml).

3. The saturation pressure corresponding to the minimum practicable temperature of heat rejection is a function of?
a) Temperature of heat rejection
b) Temperature of surroundings
c) Mean temperature of heat addition
d) None of the mentioned

View Answer

Answer: c [Reason:] The relation between saturation pressure & mean temperature of heat addition is given by, EfficiencyRankine = f(Tml) where, Tml = Mean temperature of heat addition.

4. What is the effect of the increase in the superheat at constant pressure?
a) Decreases cycle efficiency
b) Increases mean temperature of heat addition
c) Decreases mean temperature of heat addition
d) None of the mentioned

View Answer

Answer: b [Reason:] As there is an increase in superheat at constant pressure, the cycle efficiency increases & hence there is an increase in the mean temperature of heat addition.

5. PWR stands for?
a) Pressurized Water Relator
b) Pressurized Water Reheater
c) Pressurized Water Reactor
d) Pressurized Water Refractory

View Answer

Answer: c [Reason:] PWR stands for Pressurized Water Reactor which does not use Superheat.

6. The maximum temperature of steam that can be used is fixed from metallurgical considerations. This temperature limit is called?
a) Mining Limit
b) Metallurgical Limit
c) Metallic Limit
d) None of the mentioned

View Answer

Answer: b [Reason:] ‘Metallurgical Limit’ is defined as the lowest temperature limit of usable steam fixed by metallurgical considerations.

7. Most of the turbine expansion takes place in?
a) Liquid Region
b) Solid Region
c) Vapour Region
d) Plastic Region

View Answer

Answer: c [Reason:] Most of the turbine expansion should take place in the vapour region, so as to increase the life of the blades of the turbine.

8. Pelton Wheel Turbine is suited for?
a) high heads
b) low heads
c) medium heads
d) zero heads

View Answer

Answer: a [Reason:] A Pelton wheel turbine is based on the principle of changing Kinetic Energy of fluid into output work.

9. A Hydraulic Ram Pump is based on the principle of?
a) Wind Hammer
b) Water hammer
c) Wind gushing
d) None of the mentioned

View Answer

Answer: b [Reason:] A Hydraulic Ram Pump is based on the principle of Water Hammer. This principle states that, “When a flowing fluid is stopped suddenly, the kinetic energy of the rapidly moving fluid decreases to zero & in turn, increases the pressure which pulls the fluid to high heads.

10. Which of the following diagrams are used while analyzing the effect of superheat & Inlet Pressure on mean temperature of heat addition?
a) P-V diagram
b) T-S diagram
c) P-T diagram
d) V-T diagram

View Answer

Answer: b [Reason:] Using the T-S diagram gives us an overview as to where a particular process occurs, i.e., it is within the solid region, the gaseous region or the vapour region. So, here, we prefer T-S diagram for analysis process.

11. Which of these constitute a Carnot Cycle?
a) 2 reversible isotherms & 2 reversible adiabatics
b) 1 reversible isotherms & 2 reversible adiabatics
c) 2 reversible isotherms & 1 reversible adiabatics
d) 1 reversible isotherms & 2 reversible adiabatics

View Answer

Answer: a [Reason:] A combination of 2 reversible isotherms & 2 reversible adiabatics gives a Carnot Cycle (from the P-V diagram).

12. Work input and work outputs are given & obtained in?
a) 2 reversible adiabatics
b) 2 reversible isotherms
c) 1 reversible isotherm & 1 reversible adiabatic
d) 2 reversible isotherms & 1 reversible adiabatic

View Answer

Answer: a [Reason:] The work input & output are both in the 2 reversible adiabatics (from the P-V diagram).

13. Heat input & output is obtained in?
a) 2 reversible adiabatics
b) 2 reversible isotherms
c) 1 reversible isotherm & 1 reversible adiabatic
d) 2 reversible isotherms & 1 reversible adiabatic

View Answer

Answer: b [Reason:] The heat inputs & outputs are in 2 reversible isotherms (from the P-V diagram).

14. The elements of a Carnot heat engine are?
a) Heat Exchangers, Turbine, Pump
b) Heat Exchangers, Turbine, Evaporator
c) Heat Exchangers, Turbine, Condenser
d) Heat Exchangers, Turbine, Superheater

View Answer

Answer: a [Reason:] There are 2 heat exchangers, a turbine & a pump in a Carnot heat engine.

15. Which of these shouldn’t be there in the pipelines of working fluid for achieving the conditions of Carnot Cycle?
a) Heat Transfer
b) Insulation
c) Lubrication
d) Zero Friction

View Answer

Answer: a [Reason:] Heat Transfer & Friction are the factors affecting the conditions of a Carnot Cycle.

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