Home » Mechanical Engineering » Mechanical Engineering MCQ » Engineering Thermodynamics MCQ

320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download

Engineering Thermodynamics MCQ Question and Answer | PDF Free Download

1.The entropy may be expressed as a function of

  • APressure and temperature
  • BTemperature and volume
  • CHeat and work
  • DAll of these
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Pressure and temperature

Explanation:

2.A molecule consisting of one atom is known as

  • AMono-atomic
  • BDi-atomic
  • CTri-atomic
  • DPoly-atomic
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Mono-atomic

Explanation:

3.One molecule of oxygen consists of __________ atoms of oxygen.

  • A2
  • B4
  • C8
  • D16
Answer / Hint Save Question
Correct Answer : (A)

2

Explanation:

4.For the same maximum pressure and temperature

  • AOtto cycle is more efficient than Diesel cycle
  • BDiesel cycle is more efficient than Otto cycle
  • CDual cycle is more efficient than Otto and Diesel cycles
  • DDual cycle is less efficient than Otto and Diesel cycles
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Diesel cycle is more efficient than Otto cycle

Explanation:

5.Mixture of ice and water form a

  • AClosed system
  • BOpen system
  • CIsolated system
  • DHeterogeneous system
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Heterogeneous system

Explanation:

6.The unit of length in S.I. units is

  • AMeter
  • BCentimeter
  • CKilometer
  • DMillimeter
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Meter

Explanation:

7.The unit of pressure in S.I. units is

  • Akg/cm²
  • Bmm of water column
  • CPascal
  • DDyne per square cm
Answer / Hint Save Question Comment On Question
Correct Answer : (C)

Pascal

Explanation:

8.The unit of mass in S.I. units is

  • AKilogram
  • BGram
  • CTonne
  • DQuintal
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Kilogram

Explanation:

9.During which of the following process does heat rejection takes place in Carnot cycle?

  • AIsothermal expansion
  • BIsentropic expansion
  • CIsothermal compression
  • DIsentropic compression
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Isentropic compression

Explanation:

10.The general law of expansion or compression is pvn = C, The process is said to be hyperbolic, if n is equal to

  • A0
  • B1
  • CY
  • D
Answer / Hint Save Question
Correct Answer : (B)

1

Explanation:

11.Molecular volume of any perfect gas at 600 × 103 N/m² and 27°C will be

  • A4.17 m3/kg mol
  • B400 m3/kg mol
  • C0.15 m3/kg mol
  • D41.7 m3/kg mol
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

4.17 m3/kg mol

Explanation:

12.The absolute zero pressure can be attained at a temperature of

  • A0°C
  • B-273°C
  • C273 K
  • DNone of these
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

None of these

Explanation:

13.An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is

  • AFeasible
  • BImpossible
  • CPossible
  • DPossible, but with lot of sophistications
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Possible, but with lot of sophistications

Explanation:

14.Which of the following items is not a path function?

  • AHeat
  • BWork
  • CKinetic energy
  • DThermal conductivity
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Thermal conductivity

Explanation:

15.Addition of heat at constant pressure to a gas results in

  • ARaising its temperature
  • BRaising its pressure
  • CRaising its volume
  • DRaising its temperature and doing external work
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Raising its temperature and doing external work

Explanation:

16.The unit of energy in S.I. units is

  • AWatt
  • BJoule
  • Cjoule/s
  • Djoule/m
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

Joule

Explanation:

17.The unit of time in S.I. units is

  • ASecond
  • BMinute
  • CHour
  • DDay
Answer / Hint Save Question Comment On Question
Correct Answer : (A)

Second

Explanation:

18.The unit of temperature in S.I. units is

  • ACentigrade
  • BCelsius
  • CFahrenheit
  • DKelvin
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Kelvin

Explanation:

19.The unit of power in S.I. units is

  • ANewton
  • BPascal
  • CErg
  • DWatt
Answer / Hint Save Question Comment On Question
Correct Answer : (D)

Watt

Explanation:

20.The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

  • A29.27 J/kmol °K
  • B83.14 J/kmol °K
  • C848 J/kmol °K
  • D735 J/kmol °K
Answer / Hint Save Question Comment On Question
Correct Answer : (B)

83.14 J/kmol °K

Explanation: