# Mechanical Engineering Thermodynamics – Set 19

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## Q1. Kerosene is distilled at

(A) 65° to 220°C
(B) 220° to 345°C
(C) 345° to 470°C
(D) 470° to 550°C

## Q2. In closed cycle gas turbine, the air is compressed

(A) Isothermally
(B) Isentropically
(C) Polytropically
(D) None of these

## Q3. Reversed Joule cycle is known as

(A) Carnot cycle
(B) Bell-Coleman cycle
(C) Rankine cycle
(D) Stirling cycle

## Q4. According to First law of thermodynamics,

(A) Total internal energy of a system during a process remains constant
(B) Total energy of a system remains constant
(C) Work-done by a system is equal to the heat transferred by the system
(D) Internal energy, enthalpy and entropy during a process remain constant

Answer: (B) Total energy of a system remains constant

## Q5. The property of a working substance which increases or decreases as the heat is supplied or removed in a reversible manner, is known as

(A) Enthalpy
(B) Internal energy
(C) Entropy
(D) External energy

## Q6. A close cycle gas turbine gives __ efficiency as compared to an open cycle gas turbine.

(A) Same
(B) Lower
(C) Higher
(D) None of these

(A) 0.224 liters
(B) 2.24 liters
(C) 22.4 liters
(D) 224 liters

## Q8. According to kinetic theory of gases, the velocity of molecules __ with the increase in temperature.

(A) Remains constant
(B) Increases
(C) Decreases
(D) None of these

(A) 1
(B) 1.4
(C) 1.67
(D) 1.87

(A) Pressure
(B) Volume
(C) Temperature
(D) Density

(A) 4/7
(B) 11/4
(C) 9/7
(D) All of these

## Q12. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as

(A) Law of equipartition of energy
(B) Law of conservation of energy
(C) Law of degradation of energy
(D) None of these

Answer: (A) Law of equipartition of energy

## Q13. Carnot cycle has maximum efficiency for

(A) Petrol engine
(B) Diesel engine
(C) Reversible engine
(D) Irreversible engine

## Q14. The specific heat at constant volume is

(A) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
(C) The amount of heat required to raise the temperature of 1 kg of water through one degree
(D) Any one of the above

Answer:(B) The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

## Q15. In open cycle gas turbine plants

(A) The indirect heat exchanger and cooler is avoided
(B) Direct combustion system is used
(C) A condenser is used
(D) All of the above

Answer: (D) All of the above

## Q16. The thermal efficiency of an ideal gas turbine plant is given by (where r = Pressure ratio)

(A) rγ – 1
(B) 1 – rγ – 1
(C) 1 – (1/r) γ/γ – 1
(D) 1 – (1/r) γ – 1/ γ

Answer: (D) 1 – (1/r) γ – 1/ γ

## Q17. Which of the following statement is correct?

(A) The heat and work are boundary phenomena
(B) The heat and work represent the energy crossing the boundary of the system
(C) The heat and work are path functions
(D) All of the above

Answer: (D) All of the above

## Q18. When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is

(A) Coke
(B) Wood charcoal
(C) Bituminous coal
(D) Briquetted coal

## Q19. The fuel mostly used in steam boilers is

(A) Brown coal
(B) Peat
(C) Coking bituminous coal
(D) Non-coking bituminous coal