# Practice Test: Question Set - 23

1. Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)
(A) cv/ cp =R
(B) cp - cv = R
(C) cv = R/ γ-1
(D) Both (B) and (C)

2. A cycle consisting of two constant pressure and two isentropic processes is known as
(A) Carnot cycle
(B) Stirling cycle
(C) Otto cycle
(D) None of these

3. The atomic mass of sulphur is
(A) 12
(B) 14
(C) 16
(D) 32

4. The efficiency of Carnot cycle depends upon
(A) Temperature limits
(B) Pressure ratio
(C) Volume compression ratio
(D) Cut-off ratio and compression ratio

5. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
(A) Combustion is at constant volume
(B) Expansion and compression are isentropic
(C) Maximum temperature is higher
(D) Heat rejection is lower

6. The value of 1 mm of Hg is equal to
(A) 1.333 N/m2
(B) 13.33 N/m2
(C) 133.3 N/m2
(D) 1333 N/m2

7. Carbonization of coal consists of
(A) Drying and crushing the coal to a fine powder
(B) Moulding the finely ground coal under pressure with or without a binding material
(C) Heating the wood with a limited supply of air to temperature not less than 280°C
(D) None of the above

8. The area under the temperature-entropy curve (T - s curve) of any thermodynamic process represents
(A) Heat absorbed
(B) Heat rejected
(C) Either (A) or (B)
(D) None of these

9. One Joule (J) is equal to
(A) 1 N-m
(B) 1 kN-m
(C) 10 N-m/s
(D) 10 kN-m/s

10. According to First law of thermodynamics,
(A) Total internal energy of a system during a process remains constant
(B) Total energy of a system remains constant
(C) Work-done by a system is equal to the heat transferred by the system
(D) Internal energy, enthalpy and entropy during a process remain constant

11. When wood is heated with a limited supply of air to a temperature not less than 280°C, the resulting fuel is
(A) Coke
(B) Wood charcoal
(C) Bituminous coal
(D) Briquetted coal

12. The heat energy stored in the gas and used for raising the temperature of the gas is known as
(A) External energy
(B) Internal energy
(C) Kinetic energy
(D) Molecular energy

13. Which of the following statement is wrong?
(A) The closed cycle gas turbine plants are external combustion plants.
(B) In the closed cycle gas turbine, the pressure range depends upon the atmospheric pressure.
(C) The advantage of efficient internal combustion is eliminated as the closed cycle has an external surface.
(D) In open cycle gas turbine, atmosphere acts as a sink and no coolant is required.

14. The temperature at which the volume of a gas becomes zero is called
(A) Absolute scale of temperature
(B) Absolute zero temperature
(C) Absolute temperature
(D) None of these

15. One kg of ethylene (C2H4) requires 2 kg of oxygen and produces 22/7 kg of carbon dioxide and __________ kg of water or steam.
(A) 9/7
(B) 11/7
(C) 7/4
(D) 11/4

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