MCQ 1 MCQ 2 MCQ 3 MCQ 4 >>

1. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

kilo Joule

specific heat at constant volume

specific heat at constant pressure

none of these

2. The processes occurring in open system which permit the transfer of mass to and from the system, are known as

adiabatic processes

non-flow processes

flow processes

none of these

3. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.

False

True

4. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

cut-off is zero

cut-off is constant

cut-off is increased

cut-off is decreased

5. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as

Otto cycle

Diesel cycle

Carnot cycle

Stirling cycle

6. There is a loss of heat in an irreversible process.

True

False

7. An adiabatic process is one in which

the change in internal energy is equal to the mechanical work done.

all of these

no heat enters or leaves the gas.

the temperature of the gas changes.

8. Workdone in a free expansion process is

positive

minimum

zero

maximum

9. Which of the following is the lightest and most volatile liquid fuel?

Gasoline

Fuel oil

Kerosene

10. Which of the following has the minimum atomic mass?

Carbon

Nitrogen

Oxygen

Sulphur

11. Which of the following represents Otto cycle on temperature - entropy (T - s) diagram?

12. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.

two-third

one-third

one-half

three-fourth

13. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.

Incorrect

Correct

14. The compression ratio for petrol engines is

20 to 30

15 to 20

5 to 8

3 to 6

15. The value of specific heat at constant pressure (c_p) is __________ that of at constant volume (c_v).

equal to

more than

less than

16. The most probable velocity of the gas molecules is given by

17. Carbonisation of coal consists of

heating the wood with a limited supply of air to temperature not less than 280°C

moulding the finely ground coal under pressure with or without a binding material

none of these

drying and crushing the coal to a fine powder

18. The ratio of specific heat at constant pressure (c_p) and specific heat at constant volume (c_v) is

less than one

none of these

greater than one

equal to one

19. There is no change in internal energy in an isothermal process.

Incorrect

Correct

20. The atomic mass of oxygen is

12

32

16

14

Thermodynamics MCQ 1

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1. A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

isothermal process

polytropic process

hyperbolic process

adiabatic process

2. A closed system is one in which heat and work crosses the boundary of the system but the mass of the working substance does not crosses the boundary of the system.

No

Yes

3. The free expansion process is a constant enthalpy process.

Incorrect

Correct

4. The greater the pressure difference in throttling, the lesser is the irreversibility.

No

Yes

5. Kelvin-Planck's law deals with

conservation of heat

conservation of work

conversion of heat into work

conversion of work into heat

6. One kg of carbon produces __________ kg of carbon dioxide.

7/3

3/7

11/3

3/11

7. For a perfect gas, according to Boyle's law (where p = Absolute pressure, v = Volume, and T = Absolute temperature)

p/T = constant, if v is kept constant

p v = constant, if T is kept constant

v/T = constant, if p is kept constant

T/p = constant, if v is kept constant

8. The expansion ratio (r) is the ratio of (where v₁ = Volume at the beginning of expansion, and v₂ = Volume at the end of expansion)

9. Ericsson cycle consists of two constant pressure and two isothermal processes.

Disagree

Agree

10. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle

expansion and compression are isentropic

heat rejection is lower

combustion is at constant volume

maximum temperature is higher

11. The efficiency of Diesel cycle depends upon

pressure ratio

cut-off ratio and compression ratio

compression ratio

temperature limits

12. Liquid fuels have lower efficiency than solid fuels.

False

True

13. The general gas energy equation is (where Q_{1 - 2} = Heat supplied, dU = Change in internal energy, and W_{1 - 2} = Work done in heat units)

Q_{1 - 2} = dU - W_{1 - 2}

Q_{1 - 2} = dU + W_{1 - 2}

Q_{1 - 2} = dU x W_{1 - 2}

Q_{1 - 2} = dU/W_{1 - 2}

14. The dual combustion cycle consists of one constant pressure, two constant volume and two isentropic processes.

Disagree

Agree

15. The heat supplied to the gas at constant volume is (where m = Mass of gas, c_v = Specific heat at constant volume, c_p = Specific heat at constant pressure, T₂ - T₁ = Rise in temperature, and R = Gas constant)

mR(T₂ - T₁)

mc_v(T₂ - T₁)

mc_p(T₂ - T₁)

mc_p(T₂ + T₁)

16. The efficiency of a dual combustion cycle __________ upon cut-off ratio.

depends

does not depend

17. The compression ratio for Diesel engines is

5 to 8

15 to 20

3 to 6

20 to 30

18. Liquid fuels consist of hydrocarbons.

False

True

19. Liquid fuels have higher calorific value than solid fuels.

Yes

No

20. Hydrogen is the __________ substance.

heaviest

lightest

Thermodynamics MCQ 4

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1. Producer gas is obtained by

carbonisation of bituminous coal.

partial combustion of coal, coke, anthracite coal or charcoal in a mixed air steam blast.

passing steam over incandescent coke.

passing air and a large amount of steam over waste coal at about 650°C.

2. The blast furnace gas is a by-product in the production of pig iron in the blast furnace.

Yes

No

3. The gas constant (R) is equal to the __________ of two specific heats.

product

ratio

sum

difference

4. Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source.

There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy.

all of these

5. The isothermal and isentropic processes are reversible non-flow processes.

Agree

Disagree

6. A mixture of gas expands from 0.03 m³ to 0.06 m³ at a constant pressure of 1 MPa and absorbs 84 kJ of heat during the process. The change in internal energy of the mixture is

84 kJ

114 kJ

54 kJ

30 kJ

7. The heat absorbed during a polytropic process is

x Workdone

All of these

8. In an isothermal process,

all of these

there is no change in temperature

there is no change in enthalpy

there is no change in internal energy

9. The free expansion process is __________ non-flow process.

irreversible

reversible

10. Otto cycle is also known as

constant temperature cycle

constant temperature and pressure cycle

constant pressure cycle

constant volume cycle

11. The measurement of a thermodynamic property known as temperature is based on

none of these

Second law of thermodynamics

First law of thermodynamics

Zeroth law of thermodynamics

12. The efficiency of Carnot cycle depends upon

volume compression ratio

pressure ratio

temperature limits

cut-off ratio and compression ratio

13. Coke is produced

when coal is first dried and then crushed to a fine powder by pulverising machine

by heating wood with a limited supply of air to a temperature not less than 280°C

when coal is strongly heated continuously for 42 to 48 hours in the absence of air in a closed vessel

from the finely ground coal by moulding under pressure with or without a binding material

14. Which of the following is an intensive property of a thermodynamic system?

Temperature

Mass

Energy

Volume

15. The state of a substance whose evaporation from its liquid state is complete, is known as

perfect gas

vapour

air

steam

16. For the same compression ratio, the efficiency of dual combustion cycle is

less than Diesel cycle

less than Diesel cycle and greater than Otto cycle

greater than Diesel cycle and less than Otto cycle

greater than Diesel cycle

17. When a gas is heated, change takes place in

temperature

all of these

pressure

volume

18. When the expansion or compression takes place according to the law pvⁿ = C, the process is known as

polytropic process

hyperbolic process

adiabatic process

isothermal process

19. The main cause for the irreversibility is

heat transfer with a finite temperature difference

mechanical and fluid friction

unrestricted expansion

all of these

20. The gas turbine cycle with re-generator improves

avoids pollution

work ratio

thermal efficiency

none of these

Thermodynamics MCQ 6

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1. The heating of a gas at constant pressure is governed by Charles' law.

False

True

2. The condition for the reversibility of a cycle is

the working parts of the engine must be friction free

all of these

all the processes, taking place in the cycle of operation, must be extremely slow

the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process

3. In open cycle gas turbine plants

a condenser is used

direct combustion system is used

the indirect heat exchanger and cooler is avoided

all of these

4. The compression ratio is the ratio of

total volume to swept volume

swept volume to total volume

swept volume to clearance volume

total volume to clearance volume

5. The conditions of temperature and pressure at 0°C (273K) and 760 mm of Hg pressure are termed as __________ temperature and pressure.

standard

normal

6. The state of a substance whose evaporation from its liquid state is partial, is known as steam.

Disagree

Agree

7. The hard coke is obtained when carbonisation of coal is carried out at

300° to 500°C

700° to 900°C

900° to 1100°C

500° to 700°C

8. According to First law of thermodynamics,

workdone by a system is equal to the heat transferred by the system

internal energy, enthalpy and entropy during a process remains constant

total energy of a system remains constant

total internal energy of a system during a process remains constant

9. One molecule of oxygen consists of __________ atoms of oxygen.

16

4

2

8

10. Stirling cycle consists of

two constant volume and two isentropic processes

two constant volume and two isothermal processes

one constant volume, one constant pressure and two isentropic processes

two constant pressure and two isothermal processes

11. The amount of heat given out by the complete combustion of 1 kg of fuel is known as calorific value of solid or liquid fuel.

True

False

12. Carnot cycle consists of

two isothermal and two isentropic processes

one constant volume, one constant pressure and two isentropic processes

two constant volume and two isentropic processes

two constant pressure and two isentropic processes

13. The root mean square velocity of the gas molecules is given by (where k = Boltzmann's constant, T = Absolute temperature, and m = Mass of one molecule of a gas)

14. The efficiency of Ericsson cycle is __________ Carnot cycle.

less than

greater than

equal to

15. The numerical value of the thermal capacity and the water equivalent of the substance are the same.

Disagree

Agree

16. When a fluid is allowed to expand suddenly into a vacuum chamber through an orifice of large dimensions, the process is known as free expansion process.

False

True

17. The value of universal gas constant is same for all gases.

Yes

No

18. The temperature at which the volume of a gas becomes zero is called

absolute scale of temperature

absolute temperature

none of these

absolute zero temperature

19. The gas in cooling chamber of a closed cycle gas turbine is cooled at

none of these

constant volume

constant temperature

constant pressure

20. When a gas is heated at constant pressure

its temperature will increase

its volume will increase

neither temperature not volume will increase

both temperature and volume will increase

Thermodynamics MCQ 7

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1. The absolute pressure of a given mass of a perfect gas varies inversely as its volume, when the temperature remains constant. This statement is known as Boyle's law.

Yes

No

2. As per Charles' law, the volume of a given mass of a perfect gas varies __________ as its absolute temperature, when the absolute pressure remains constant.

directly

indirectly

3. The heating of gas at constant volume is governed by

Charles' law

Avogadro's law

Gay-Lussac law

Boyle's law

4. By decreasing the highest temperature in the Carnot cycle, its efficiency is increased.

True

False

5. One kg of carbon monoxide requires 4/7 kg of oxygen and produces

7/3 kg of carbon monoxide gas

11/7 kg of carbon dioxide gas

8/3 kg of carbon monoxide gas

11/3 kg of carbon dioxide gas

6. Workdone during adiabatic expansion is given by (where p₁ v₁, T₁ = Pressure, volume and temperature for the initial condition of gas, p₂, v₂, T₂ = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

All of these

7. The absolute zero pressure will be

when molecular momentum of the system becomes zero

at the temperature of - 273 K

at the centre of the earth

at sea level

8. The principal constituents of a fuel are

sulphur and hydrogen

sulphur and oxygen

oxygen and hydrogen

carbon and hydrogen

9. Which of the following gas has the highest calorific value?

Producer gas

Blast furnace gas

Coal gas

Mond gas

10. The oxygen atom is __________ times heavier than the hydrogen atom.

4

8

2

16

11. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of

0.224 litres

224 litres

22.4 litres

2.24 litres

12. The work ratio of a gas turbine plant is given by

13. When the gas is cooled at constant pressure,

its temperature increases but volume decreases

both temperature and volume decreases

its volume increases but temperature decreases

both temperature and volume increases

14. Boyle's law states that change of internal energy of a perfect gas is directly proportional to the change of temperature.

Disagree

Agree

15. The ratio of specific heat at constant pressure (c_p) and specific heat at constant volume (c_v) is always __________ one.

greater than

equal to

less than

16. The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by

Gay-Lussac

Joule

Kelvin

Clausius

17. The variables which control the physical properties of a perfect gas are

temperature of the gas

volume occupied by the gas

pressure exerted by the gas

all of these

18. The isothermal and adiabatic processes are regarded as

reversible or irreversible process

irreversible process

reversible process

none of these

19. The gas constant (R) is equal to the

product of two specific heats

sum of two specific heats

difference of two specific heats

ratio of two specific heats

20. The unit of power in S.I. units is watt.

False

True

Thermodynamics MCQ 8

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1. Otto cycle consists of

two constant pressure and two isentropic processes

two constant volume and two isothermal processes

two constant volume and two isentropic processes

one constant pressure, one constant volume and two isentropic processes

2. The general gas equation is (where p = Pressure, v = Volume, m = mass, T = Absolute temperature, and R = Gas constant)

pv = RT^m

pv = (RT)^m

pv^m = RT

pv = mRT

3. The increase in entropy of a system represents

increase in availability of energy

degradation of energy

increase in temperature

decrease in pressure

4. The work ratio of simple gas turbine cycle depends upon

minimum cycle temperature

all of these

maximum cycle temperature

pressure ratio

5. In a free expansion process,

W_{1 - 2} = 0

dU = 0

all of these

Q_{1 - 2} = 0

6. One kg of ethylene (C₂H₄) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.

11/4

7/4

9/7

11/7

7. A perpetual motion machine of the first kind is __________ according to first law of thermodynamics.

impossible

possible

8. The efficiency of a gas turbine is given by

9. One m³ of methane (CH₄) requires 2m³ of oxygen and produces 1m³ of carbon dioxide and 2m³ of water or steam.

Incorrect

Correct

10. The smallest quantity of a substance, which can exist by itself in a chemically recognisable form is known as

molecule

element

atom

compound

11. An open system is one in which

heat and work crosses the boundary of the system, but the mass of the working substance does not crosses the boundary of the system

mass of the working substance crosses the boundary of the system but the heat and work does not crosses the boundary of the system

both the heat and work as well as mass of the working substance crosses the boundary of the system

neither the heat and work nor the mass of the working substance crosses the boundary of the system

12. The efficiency of Otto cycle depends upon the specific heats of the working substance.

Yes

No

13. A process, in which the gas is heated or expanded in such a way that product of its pressure and volume remains constant, is called isothermal process.

Yes

No

14. In closed cycle gas turbine, the air is compressed

polytropically

isentropically

none of these

isothermally

15. The standard value of atmospheric pressure taken at sea level is

1.013 bar

101300 N/m²

all of these

760 mm of Hg

16. The unit of energy is S. I. units system is

Joule (J)

Joule/metre (J/m)

Joule metre (Jm)

Watt(W)

17. Which of the following statement is correct?

The increase in entropy is obtained from a given quantity of heat at a low temperature.

The change in entropy may be regarded as a measure of the rate of the availability or unavailability of heat for transformation into work.

The entropy represents the maximum amount of work obtainable per degree drop in temperature.

all of these

18. A process, in which the gas is heated or expanded in such a way that the product of its pressure and volume remains constant, is called

isothermal process

polytropic process

hyperbolic process

adiabatic process

19. High air-fuel ratio in gas turbines

increases power output

do not damage turbine blades

reduces exhaust temperature

improves thermal efficiency

20. If in the equation pvⁿ = C, the value of n = ∝ , then the process is called

constant pressure process

isothermal process

adiabatic process

constant volume process

Thermodynamics MCQ 9

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