Thermodynamics MCQs With Answers
Thermodynamics MCQ
SET-1
1. All the commercial liquid fuels are derived from natural petroleum (or crude oil).
- A.True
- B. False
Answer: A
2. A cycle consisting of one constant pressure, one constant volume and two isentropic processes is known as
- A.Carnot cycle
- B.Stirling cycle
- C.Otto cycle
- D.Diesel cycle
Answer: D
3. The efficiency and work ratio of a simple gas turbine cycle are
- A.low
- B.very low
- C.high
- D.very high
Answer: B
4. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
- A.specific heat at constant volume
- B.specific heat at constant pressure
- C.kilo Joule
- D.none of these
Answer: A
5. There is a loss of heat in an irreversible process.
- A.True
- B.False
Answer: A
6. An adiabatic process is one in which
- A.no heat enters or leaves the gas
- B.the temperature of the gas changes
- C.the change in internal energy is equal to the mechanical workdone
- D.all of the above
Answer: D
7. Water gas is obtained by passing air and a large amount of steam over waste coal at about 650°C.
- A.Correct
- B.Incorrect
Answer: B
8. Which of the following represents Otto cycle on temperature – entropy (T – s) diagram?
9. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.
- A.True
- B.False
Answer: A
10. Which of the following is the lightest and most volatile liquid fuel?
- A.Gasoline
- B.Kerosene
- C.Fuel oil
Answer: A
11. The processes occuring in open system which permit the transfer of mass to and from the system, are known as
- A.flow processes
- B.non-flow processes
- C.adiabatic processes
- D.none of these
Answer: A
12. Which of the following has the minimum atomic mass?
- A.Oxygen
- B.Sulphur
- C.Nitrogen
- D.Carbon
Answer: D
13. Workdone in a free expansion process is
- A.zero
- B.minimum
- C.maximum
- D.positive
Answer: A
14. The pressure exerted by an ideal gas is __________ of the kinetic energy of all the molecules contained in a unit volume of gas.
- A.one-half
- B.one-third
- C.two-third
- D.three-fourth
Answer: C
15. The compression ratio for petrol engines is
- A.3 to 6
- B.5 to 8
- C.15 to 20
- D.20 to 30
Answer: B
16. The most probable velocity of the gas molecules is given by
Answer: B
17. The efficiency of Diesel cycle approaches to Otto cycle efficiency when
- A. cut-off is increased
- B. cut-off is decreased
- C. cut-off is zero
- D. cut-off is constant
Answer: C
18.The entropy __________ in an irreversible cyclic process.
- A. remains constant
- B. decreases
- C. increases
Answer: C
19. The atomic mass of oxygen is
- A. 12
- B. 14
- C. 16
- D. 32
Answer: C
20. The ratio of specific heat at constant pressure (Cp) and specific heat at constant volume (cv) is
- A. equal to one
- B. less than one
- C. greater than one
- D. none of these
Answer: C