Engineering Thermodynamics Questions And Answers - Set 26 - ObjectiveBooks
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# Practice Test: Question Set - 26

1. When a system changes its state from one equilibrium state to another equilibrium state, then the path of successive states through which the system has passed, is known as
(A) Thermodynamic law
(B) Thermodynamic process
(C) Thermodynamic cycle
(D) None of these

2. When the gas is cooled at constant pressure,
(A) Its temperature increases but volume decreases
(B) Its volume increases but temperature decreases
(C) Both temperature and volume increases
(D) Both temperature and volume decreases

3. Otto cycle consists of
(A) Two constant volume and two isentropic processes
(B) Two constant pressure and two isentropic processes
(C) Two constant volume and two isothermal processes
(D) One constant pressure, one constant volume and two isentropic processes

4. 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)

5. An open cycle gas turbine works on
(A) Carnot cycle
(B) Otto cycle
(C) Joule's cycle
(D) Stirling cycle

6. If the value of n = 0 in the equation pvn = C, then the process is called
(A) Constant volume process
(C) Constant pressure process
(D) Isothermal process

7. The efficiency of Ericsson cycle is __________ Carnot cycle.
(A) Greater than
(B) Less than
(C) Equal to
(D) None of these

8. The mass of excess air supplied is equal to
(A) (23/100) × Mass of excess carbon
(B) (23/100) × Mass of excess oxygen
(C) (100/23) × Mass of excess carbon
(D) (100/23) × Mass of excess oxygen

9. The universal gas constant (or molar constant) of a gas is the product of
(A) Molecular mass of the gas and the gas constant
(B) Atomic mass of the gas and the gas constant
(C) Molecular mass of the gas and the specific heat at constant pressure
(D) Molecular mass of the gas and the specific heat at constant volume

10. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
(A) 0.224 liters
(B) 2.24 liters
(C) 22.4 liters
(D) 224 liters

11. The standard value of atmospheric pressure taken at sea level is
(A) 1.013 bar
(B) 760 mm of Hg
(C) 1013 × 102 N/m2
(D) All of these

12. The process is adiabatic, if the value of n in the equation pvn = C, is
(A) Zero
(B) One
(C) γ
(D) ∝

13. 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)]

14. 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

15. 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

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