320 Important Engineering Thermodynamics MCQ Question and Answer | PDF Free Download
1.The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)
- A(T1/T2) – 1
- B1 - (T1/T2)
- C1 - (T2/T1)
- D1 + (T2/T1)
2.The compression ratio for Diesel engines is
- A15 to 20
- B5 to 8
- C3 to 6
- D20 to 30
3.If both Stirling and Carnot cycles operate within the same temperature limits, then efficiency of Stirling cycle as compared to Carnot cycle
- AMore
- BLess
- CEqual
- DDepends on other factors
4.The same volume of all gases would represent their
- ADensities
- BSpecific weights
- CMolecular weights
- DGas characteristic constants
5.Reversed Joule cycle is known as
- ACarnot cycle
- BBell-Coleman cycle
- CRankine cycle
- DStirling cycle
6.Energy can neither be created nor destroyed, but it can be transformed from one form to another. This statement is known as
- AZeroth law of thermodynamics
- BFirst law of thermodynamics
- CSecond law of thermodynamics
- DKinetic theory of gases
7.The heat flows from a cold body to a hot body with the aid of an external source. This statement is given by
- AKelvin
- BJoule
- CClausis
- DGay-Lussac
8.Superheated vapour behaves
- AExactly as gas
- BAs steam
- CAs ordinary vapour
- DApproximately as a gas
9.The efficiency of Diesel cycle approaches to Otto cycle efficiency when
- ACut-off is decreased
- BCut-off is constant
- CCut-off is increased
- DCut-off is zero
10.The pressure of a gas in terms of its mean kinetic energy per unit volume 'E' is equal to
- AE/3
- BE/2
- C3E/4
- D2E/3
11.The entropy __________ in an irreversible cyclic process.
- ARemains constant
- BDecreases
- CIncreases
- DNone of these
12.Reversed joule cycle is called
- ACarnot cycle
- BRankine cycle
- CBrayton cycle
- DBell Coleman cycle
13.One Joule (J) is equal to
- A1 kN-m
- B1 N-m
- C10 kN-m/s
- D10 N-m/s
14.The efficiency of a Carnot engine depends on
- AWorking substance
- BDesign of engine
- CSize of engine
- DTemperatures of source and sink
15.The gas turbine cycle with regenerator improves
- AWork ratio
- BThermal efficiency
- CAvoid pollution
- DNone of these
16.The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)
- Av1/v2
- Bv2/v1
- C(v1 + v2)/v1
- D(v1 + v2)/v2
17.Carnot cycle efficiency depends upon
- AProperties of the medium/substance used
- BCondition of engine
- CWorking condition
- DTemperature range of operation
18.Kerosene is distilled at
- A65° to 220°C
- B220° to 345°C
- C345° to 470°C
- D470° to 550°C
19.Calorie is a measure of
- ASpecific heat
- BQuantity of heat
- CThermal capacity
- DEntropy
20.In an isothermal process, the internal energy
- AIncreases
- BDecreases
- CRemain constant
- DFirst increases and then decreases