Engineering Thermodynamics Questions And Answers – Set 29

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All questions answers in the last paragraph

Q1. If the value of n = 0 in the equation pvn = C, then the process is called

(A) Constant volume process
(B) Adiabatic process
(C) Constant pressure process
(D) Isothermal process

Q2. According to kinetic theory of gases, the velocity of molecules __ with the increase in temperature.

(A) Remains constant
(B) Increases
(C) Decreases
(D) None of these

Q3. The ratio of molar specific heats for mono-atomic gas is

(A) 1
(B) 1.4
(C) 1.67
(D) 1.87

Q4. Which of the following is the extensive property of a thermodynamic system?

(A) Pressure
(B) Volume
(C) Temperature
(D) Density

Q5. One kg of carbon produces __ kg of carbon dioxide.

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

Q6. An open cycle gas turbine works on

(A) Carnot cycle
(B) Otto cycle
(C) Joule’s cycle
(D) Stirling cycle

Q7. The ultimate analysis of coal consists of the determination of the percentage of

(A) Carbon
(B) Hydrogen and nitrogen
(C) Sulphur and ash
(D) All of these

Q8. Steam coal is a

(A) Pulverized coal
(B) Brown coal
(C) Coking bituminous coal
(D) Non-coking bituminous coal

Q9. The increase in entropy of a system represents

(A) Increase in availability of energy
(B) Increase in temperature
(C) Decrease in pressure
(D) Degradation of energy

Q10. Which of the following process can be made reversible with the help of a regenerator?

(A) Constant pressure process
(B) Constant volume process
(C) Constant pvn process
(D) All of these

Q11. The efficiency of a gas turbine is given by

(A) (Net work output)/(Work-done by the turbine)
(B) (Net work output)/(Heat supplied)
(C) (Actual temperature drop)/(Isentropic temperature drop)
(D) (Isentropic increase in temperature)/(Actual increase in temperature)

Q12. The heating of gas at constant volume is governed by

(A) Boyle’s law
(B) Charles’ law
(C) Gay-Lussac law
(D) Avogadro’s law

Q13. When a gas is heated at constant pressure

(A) Its temperature will increase
(B) Its volume will increase
(C) Both temperature and volume will increase
(D) Neither temperature not volume will increase

Q14. A cycle consisting of two isothermal and two isentropic processes, is known as

(A) Carnot cycle
(B) Stirling cycle
(C) Ericsson cycle
(D) Joule cycle

Q15. The gas turbine cycle with regenerator improves

(A) Thermal efficiency
(B) Work ratio
(C) Avoids pollution
(D) None of these

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