Question 1

A reversible engine performing as refrigerator has COP=33%. If the same machine operates as engine, its efficiency will be

Accepted Answer

A) 67% 
B) 33% 
C) 75% 
D) 37.5% 
A) 67% 
B) 33% 
C) 75% 
D) 37.5% A

Question 2

For storing a gas which one of the following types of compression will be ideal

Accepted Answer

A) constant volume 
B) polytropic 
C) adiabatic 
D) isothermal 
A) constant volume 
B) polytropic 
C) adiabatic 
D) isothermal D

Question 3

One reversible heat engine operates between 1600 K & T? K & another reversible heat engine operates between T? K & 400 K. If both the engines have the temperature T? must be equal to

Accepted Answer

A) 100 kj 
B) 1200 k 
C) 1400 k 
D) 800 k 
A) 100 kj 
B) 1200 k 
C) 1400 k 
D) 800 k D

Question 4

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227°C. The heat is rejected at 27°C. The cycle is reversible, if the amount of heat rejected is

Accepted Answer

A) 273 kj/s 
B) 200 kj/s 
C) 180 kj/s 
D) 150 kj/s 
A) 273 kj/s 
B) 200 kj/s 
C) 180 kj/s 
D) 150 kj/s

Question 5

A Carnot engine receiving heat at 400K has an efficiency of 25%. The C.O.P. of a Carnot refrigerator working between the same temperature limits is

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 6

Which law of thermodynamics defines entropy

Accepted Answer

A) first 
B) second 
C) third 
D) zeroeth 
A) first 
B) second 
C) third 
D) zeroeth

Question 7

In a cyclic heat engine operating between a source temperature of 600°C & a sink temperature of 20°C, the least rate of heat rejection per kW net output of the engine is

Accepted Answer

A) 0.460 kw 
B) 0.505 kw 
C) 0.588 kw 
D) 0.650 kw 
A) 0.460 kw 
B) 0.505 kw 
C) 0.588 kw 
D) 0.650 kw

Question 8

A thermodynamic cycle operates between 400 K. & 290 K. 500 MJ/s of heat is added to the working substance. The power generated is

Accepted Answer

A) 290 mw 
B) 290 mj 
C) 137.5 mw 
D) 137.5 mj 
A) 290 mw 
B) 290 mj 
C) 137.5 mw 
D) 137.5 mj

Question 9

Consider the following statements: The definition of
1) temperature is due to zeroth law of thermodynamics
2) entropy is due to first law of thermodynamics
3) internal energy is due to second law of thermodynamics
4) reversibility is due to Kelvin-Planck's ststement of these statements

Accepted Answer

A) 1,2 & 3 are correct 
B) 1,3 & 4 are correct 
C) 1 alone is correct 
D) 2 alone is correct 
A) 1,2 & 3 are correct 
B) 1,3 & 4 are correct 
C) 1 alone is correct 
D) 2 alone is correct

Question 10

A process which can be stopped at any stage & reversed so that the system & the surroundings are exactly restored to their initial states is known as

Accepted Answer

A) thermodynamic process 
B) irreversible process 
C) reversible process 
D) isothermal process 
A) thermodynamic process 
B) irreversible process 
C) reversible process 
D) isothermal process

Question 11

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

Accepted Answer

A) divided by its specific weight 
B) multiplied by its density 
C) multiplied by its molecular weight 
D) divided by its molecular weight 
A) divided by its specific weight 
B) multiplied by its density 
C) multiplied by its molecular weight 
D) divided by its molecular weight

Question 12

Which of the following is a reversible process?

Accepted Answer

A) throttling 
B) combustion 
C) free expansion 
D) extension &compression of a spring 
A) throttling 
B) combustion 
C) free expansion 
D) extension &compression of a spring

Question 13

Leaking of air from a punctured tube is an example of

Accepted Answer

A) isothermal expansion 
B) adiabatic expansion 
C) throttling 
D) constant pressureexpansion 
A) isothermal expansion 
B) adiabatic expansion 
C) throttling 
D) constant pressureexpansion

Question 14

A heat engine using lake water at 12° C as source & the surrounding atmosphere at 2°C as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57J, then the output of the engine will be

Accepted Answer

A) 66 w 
B) 56 w 
C) 46 w 
D) 36 w 
A) 66 w 
B) 56 w 
C) 46 w 
D) 36 w

Question 15

The fundamental unit of enthalpy is

Accepted Answer

A) mlt -2 
B) ml2t-1 
C) ml2t -2 
D) ml3t -2 
A) mlt -2 
B) ml2t-1 
C) ml2t -2 
D) ml3t -2

Question 16

A reversible engine performing as engine has efficiency of 62.5%. If it is reversed to work as refrigerator its COP will be

Accepted Answer

A) 60% 
B) 62.5% 
C) 65% 
D) 37.5% 
A) 60% 
B) 62.5% 
C) 65% 
D) 37.5%

Question 17

In a reversible cycle, the source temperature is 227°C & the sink temperature is 27°C. The maximum available work for a heat input of 100 kJ will be

Accepted Answer

A) 100 kj 
B) 60 kj 
C) 40 kj 
D) 88 kj 
A) 100 kj 
B) 60 kj 
C) 40 kj 
D) 88 kj

Question 18

Which of the following processes is essentially irreversible

Accepted Answer

A) isothermal 
B) adiabatic 
C) isentropic 
D) thrittling 
A) isothermal 
B) adiabatic 
C) isentropic 
D) thrittling

Question 19

An engine receives 15152 J/s of heat & produces 5 KW of power. The efficiency of the engine is

Accepted Answer

A) 25% 
B) 27.5% 
C) 30% 
D) 33% 
A) 25% 
B) 27.5% 
C) 30% 
D) 33%

Question 20

a heat engine receives heat at the rate of 1500 kJ/min.& gives an output of 8.2 kW. Its thermal efficiency is equal to

Accepted Answer

A) 20.5 % 
B) 30.2% 
C) 32.8% 
D) 44.6% 
A) 20.5 % 
B) 30.2% 
C) 32.8% 
D) 44.6%

A reversible engine performing as refrigerator has COP=33%. If the same machine operates as engine, its efficiency will be

For storing a gas which one of the following types of compression will be ideal

One reversible heat engine operates between 1600 K & T? K & another reversible heat engine operates between T? K & 400 K. If both the engines have the temperature T? must be equal to

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227°C. The heat is rejected at 27°C. The cycle is reversible, if the amount of heat rejected is

A Carnot engine receiving heat at 400K has an efficiency of 25%. The C.O.P. of a Carnot refrigerator working between the same temperature limits is

Which law of thermodynamics defines entropy

In a cyclic heat engine operating between a source temperature of 600°C & a sink temperature of 20°C, the least rate of heat rejection per kW net output of the engine is

A thermodynamic cycle operates between 400 K. & 290 K. 500 MJ/s of heat is added to the working substance. The power generated is

Consider the following statements: The definition of 1) temperature is due to zeroth law of thermodynamics 2) entropy is due to first law of thermodynamics 3) internal energy is due to second law of thermodynamics 4) reversibility is due to Kelvin-Planck's ststement of these statements

A process which can be stopped at any stage & reversed so that the system & the surroundings are exactly restored to their initial states is known as

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

Which of the following is a reversible process?

Leaking of air from a punctured tube is an example of

A heat engine using lake water at 12° C as source & the surrounding atmosphere at 2°C as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57J, then the output of the engine will be

The fundamental unit of enthalpy is

A reversible engine performing as engine has efficiency of 62.5%. If it is reversed to work as refrigerator its COP will be

In a reversible cycle, the source temperature is 227°C & the sink temperature is 27°C. The maximum available work for a heat input of 100 kJ will be

Which of the following processes is essentially irreversible

An engine receives 15152 J/s of heat & produces 5 KW of power. The efficiency of the engine is

a heat engine receives heat at the rate of 1500 kJ/min.& gives an output of 8.2 kW. Its thermal efficiency is equal to

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Exam 4: Thermodynamics Laws, Processes, and Efficiency

A reversible engine performing as refrigerator has COP=33%. If the same machine operates as engine, its efficiency will be

For storing a gas which one of the following types of compression will be ideal

One reversible heat engine operates between 1600 K & T? K & another reversible heat engine operates between T? K & 400 K. If both the engines have the temperature T? must be equal to

A heat engine is supplied with 250 kJ/s of heat at a constant fixed temperature of 227°C. The heat is rejected at 27°C. The cycle is reversible, if the amount of heat rejected is

A Carnot engine receiving heat at 400K has an efficiency of 25%. The C.O.P. of a Carnot refrigerator working between the same temperature limits is

Which law of thermodynamics defines entropy

In a cyclic heat engine operating between a source temperature of 600°C & a sink temperature of 20°C, the least rate of heat rejection per kW net output of the engine is

A thermodynamic cycle operates between 400 K. & 290 K. 500 MJ/s of heat is added to the working substance. The power generated is

Consider the following statements: The definition of 1) temperature is due to zeroth law of thermodynamics 2) entropy is due to first law of thermodynamics 3) internal energy is due to second law of thermodynamics 4) reversibility is due to Kelvin-Planck's ststement of these statements

A process which can be stopped at any stage & reversed so that the system & the surroundings are exactly restored to their initial states is known as

To convert volumetric analysis to gravimetric analysis, the relative volume of each constituent of the flue gases is

Which of the following is a reversible process?

Leaking of air from a punctured tube is an example of

A heat engine using lake water at 12° C as source & the surrounding atmosphere at 2°C as sink executes 1080 cycles per min. If the amount of heat drawn per cycle is 57J, then the output of the engine will be

The fundamental unit of enthalpy is

A reversible engine performing as engine has efficiency of 62.5%. If it is reversed to work as refrigerator its COP will be

In a reversible cycle, the source temperature is 227°C & the sink temperature is 27°C. The maximum available work for a heat input of 100 kJ will be

Which of the following processes is essentially irreversible

An engine receives 15152 J/s of heat & produces 5 KW of power. The efficiency of the engine is

a heat engine receives heat at the rate of 1500 kJ/min.& gives an output of 8.2 kW. Its thermal efficiency is equal to

Thermodynamics and Properties of Systems

Thermodynamics: Concepts and Laws

Thermodynamics and Entropy

Gas Laws and Thermodynamics

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Steam Power Plant and Rankine Cycle

Thermodynamics and Rankine Cycle

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Concepts of Heat Transfer, Irreversibility, and Thermodynamic Properties

Thermodynamics and Heat Transfer

Thermodynamics and Entropy Principles

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