Mechanical Engineering Thermodynamics Problems mcq – Set 13

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All questions answers in the last paragraph

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

Q6. Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to

(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

Q11. The pressure of a gas in terms of its mean kinetic energy per unit volume ‘E’ is equal to

(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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