# Thermodynamics Practice Test mcq – Set 11

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## Q1. The hyperbolic process is governed by

(B) Boyle’s law
(C) Charles’ law
(D) Gay-Lussac law

## Q2. Which of the following quantities is not the property of the system?

(A) Pressure
(B) Temperature
(C) Specific volume
(D) Heat

## Q3. The more effective way of increasing efficiency of Carnot engine is to

(A) Increase higher temperature
(B) Decrease higher temperature
(C) Increase lower temperature
(D) Decrease lower temperature

## Q4. The efficiency of Diesel cycle approaches to Otto cycle efficiency when

(A) Cut-off is decreased
(B) Cut-off is constant
(C) Cut-off is increased
(D) Cut-off is zero

## Q5. The following cycle is used for air craft refrigeration

(A) Brayton cycle
(B) Joule cycle
(C) Carnot cycle
(D) Reversed Brayton cycle

## Q6. An open system is one in which

(A) Mass does not cross boundaries of the system, though energy may do so
(B) Neither mass nor energy crosses the boundaries of the system
(C) Both energy and mass cross the boundaries of the system
(D) Mass crosses the boundary but not the energy

(A) Work done
(B) Entropy
(C) Power
(D) Enthalpy

(A) Sulphur
(B) Nitrogen
(C) Oxygen
(D) Carbon

## Q9. According to Clausius’ statement of second law of thermodynamics

(A) Heat can’t be transferred from low temperature source to high temperature source
(B) Heat can be transferred for low temperature to high temperature source by using refrigeration cycle
(C) Heat can be transferred from low temperature to high temperature source if COP of process is more than unity
(D) Heat can’t be transferred from low temperature to high temperature source without the aid of external energy

## Q10. The ideal efficiency of a Brayton cycle with regeneration, with increase in pressure ratio will

(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Increase/decrease depending on application

## Q11. Which law states that the specific heat of a gas remains constant at all temperatures and pressures?

(A) Charles’ Law
(B) Joule’s Law
(C) Regnault’s Law
(D) Boyle’s Law

(A) Nitrogen
(B) Hydrogen
(C) Methane
(D) Oxygen

## Q13. The processes occurring in open system which permit the transfer of mass to and from the system, are known as

(A) Flow processes
(B) Non-flow processes
(D) None of these

## Q14. Thermal power plant works on

(A) Carnot cycle
(B) Joule cycle
(C) Rankine cycle
(D) Otto cycle

## Q15. The ideal efficiency of a Brayton cycle without regeneration, with increase in pressure ratio will

(A) Increase
(B) Decrease
(C) Remain unchanged
(D) Increase/decrease depending on application

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