# Engineering Thermodynamics Questions And Answers – Set 26

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## Q1. In an irreversible process, there is a

(A) Loss of heat
(B) No loss of heat
(C) Gain of heat
(D) No gain of heat

(A) pv = C
(B) pv = m R T
(C) pvn = C
(D) pvγ = C

(A) Zero
(B) Minimum
(C) Maximum
(D) Positive

(A) 8/3
(B) 11/3
(C) 11/7
(D) 7/3

## Q5. The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

(A) Carnot cycle can’t work with saturated steam
(B) Heat is supplied to water at temperature below the maximum temperature of the cycle
(C) A Rankine cycle receives heat at two places
(D) Rankine cycle is hypothetical

## Q6. Which of the following gas is mostly used in town for street and domestic lighting and heating?

(A) Producer gas
(B) Coal gas
(C) Mond gas
(D) Coke oven gas

## Q7. The principal constituents of a fuel are

(A) Carbon and hydrogen
(B) Oxygen and hydrogen
(C) Sulphur and oxygen
(D) Sulphur and hydrogen

## Q8. Kelvin-Planck’s law deals with

(A) Conservation of work
(B) Conservation of heat
(C) Conversion of heat into work
(D) Conversion of work into heat

## Q9. 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

## Q10. When coal is first dried and then crushed to a fine powder by pulverizing machine, the resulting fuel is called

(A) Wood charcoal
(B) Bituminous coal
(C) Briquetted coal
(D) None of these

## Q11. The polytropic index (n) is given by

(A) log (p1p2)/log (v1v2)
(B) log (p2/ p1)/log (v1/ v2)
(C) log (v1/ v2)/ log (p1/p2)
(D) log [(p1v1)/(p2v2)]

(A) 23.97 bar
(B) 25 bar
(C) 26.03 bar
(D) 34.81 bar

## Q13. Second law of thermodynamics defines

(A) Heat
(B) Work
(C) Internal energy
(D) Entropy

## Q14. The behavior of a perfect gas, undergoing any change in the variables which control physical properties, is governed by

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law
(D) All of these

## Q15. The gas in cooling chamber of a closed cycle gas turbine is cooled at

(A) Constant volume
(B) Constant temperature
(C) Constant pressure
(D) None of these

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