# Mechanical Engineering Thermodynamics Problems mcq – Set 13

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## Q1. The efficiency of Joule cycle is

(A) Less than Carnot cycle
(B) Equal to Carnot cycle
(C) Greater than Carnot cycle
(D) None of these

## Q2. The index of compression ‘n’ tends to reach ratio of specific heats ‘y’ when

(A) Flow is uniform and steady
(B) Process is isentropic
(C) Process is isothermal
(D) Process is isentropic and specific heat does not change with temperature

## Q3. The efficiency of Diesel cycle increases with

(A) Increase in cut-off
(B) Constant cut-off
(C) Decrease in cut-off
(D) None of these

## Q4. Otto cycle consists of following four processes

(A) Two isothermal and two isentropic
(B) Two isentropic and two constant volumes
(C) Two isentropic, one constant volume and one constant pressure
(D) Two isentropic and two constant pressures

## Q5. The efficiency of Diesel cycle with decrease in cut-off

(A) Increases
(B) Decreases
(C) First increases and then decreases
(D) First decreases and then increases

(A) T
(B) J
(C) J²
(D) Vr

## Q7. Change in enthalpy of a system is the heat supplied at

(A) Constant pressure
(B) Constant temperature
(C) Constant volume
(D) Constant entropy

## Q8. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called

(A) Kilo Joule
(B) Specific heat at constant volume
(C) Specific heat at constant pressure
(D) None of these

## Q9. The efficiency of a Carnot engine depends on

(A) Working substance
(B) Design of engine
(C) Size of engine
(D) Temperatures of source and sink

## Q10. The cycle in which heat is supplied at constant volume and rejected at constant pressure is known as

(A) Dual combustion cycle
(B) Diesel cycle
(C) Atkinson cycle
(D) Rankine cycle

(A) E/3
(B) E/2
(C) 3E/4
(D) 2E/3

## Q12. Measurement of temperature is based on

(A) Thermodynamic properties
(B) Zeroth law of thermodynamics
(C) First law of thermodynamics
(D) Second law of thermodynamics

## Q13. For same compression ratio and for same heat added

(A) Otto cycle is more efficient than Diesel cycle
(B) Diesel cycle is more efficient than Otto cycle
(C) Efficiency depends on other factors
(D) Both Otto and Diesel cycles are equally efficient

## Q14. Which of the following cycles is not a reversible cycle?

(A) Carnot
(B) Ericsson
(C) Stirling
(D) None of the above

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