ME3I
22337
Multiple Choice Questions (MCQs)
1 In which of the following systems does no mass transfer occur across the system boundary?- (A) isolated system
- (B) closed system
- (C) open system
- (D) none of the mentioned
2 Everything outside the system is called —–
- (A) Boundary
- (B) System
- (C) Surrounding
- (D) None of the mentioned
3 Heat is a —– Grade energy
- (A) High
- (B) Low
- (C) Medium
- (D) None of above
4 The —– of thermodynamics states that, no process is possible whose sole result is the absorption of heat from a reservoir and the complete conversion of the heat into work.
- (A) First Law
- (B) Second Law (Clausius statement)
- (C) Zeroth Law
- (D) Second Law (Kelvin-Planck statement)
5 The sum of internal energy and product of pressure and volume is called…..
- (A) Entropy
- (B) Enthalpy
- (C) Density
- (D) ideal gas
6 Which of the following properties describe entropy?
- (A) point function, intensive property
- (B) point function, extensive property
- (C) path function, extensive property
- (D) path function, intensive property
7 The first law of thermodynamics doesn’t tell us whether a thermodynamic process is feasible or not.
- (A) TRUE
- (B) FALSE
- (C)
- (D)
8 A heat engine is supplied heat at the rate of 1700KJ/min and gives output of 9 kW. Determine thermal efficiency
- (A) 38.70%
- (B) 45%
- (C) 14.80%
- (D) 31.76%
9 How much work (in kJ) does a cyclic heat engine do per cycle, if its efficiency is 0.75 and heat rejected per cycle is 40kJ?
- (A) 53.3
- (B) 80
- (C) 120
- (D) 30
10 The steady flow energy equation: Q = (h1 – h2) is applicable for?
- (A) Nozzle
- (B) Turbine
- (C) Compressor
- (D) Condenser
11 The value of characteristics gas constant is
- (A) 285 J/kg k
- (B) 287 J/kg k
- (C) 299 J/kg k
- (D) none of the mentioned
12 Characteristic gas constant is given by (here Cp=specific heat at constant pressure and Cv is the specific heat at constant volume)
- (A) R=Cv – Cp
- (B) R=Cp + Cv
- (C) R=Cp – Cv
- (D) none of the mentioned
13 Products of characteristics gas constant and molecular mass of gas is called
- (A) Universal gas constant
- (B) Characteristic gas constant
- (C) water vapour
- (D) none of the above
14 An ideal gas at 227°C is heated at constant pressure till volume becomes three times. The temperature of the gas will then be: —–
- (A) 927°C
- (B) 1027°C
- (C) 1227°C
- (D) 681°C
15 What parameter will remain constant in an Isothermal process?
- (A) Entropy
- (B) Temperature
- (C) Pressure
- (D) Enthalpy
16 A perfect gas at 27°C is heated at constant pressure till its volume is double. The final temperature is
- (A) 54°C
- (B) 654°C
- (C) 108°C
- (D) 327°C
17 The constant quantity of Charle’s Law is
- (A) Only mass of the gas
- (B) Only temperature of a gas
- (C) Pressure of a gas
- (D) Mass and temperature of a gas
18 If the temperature is increased from 0 °C to 30 °C at a constant pressure of gas having fixed mass, then the ratio of initial and final volume will be —–
- (A) 91 : 101
- (B) 91 : 100
- (C) 91 : 111
- (D) 91 : 121
19 The constant quantity(s) gayluassac Law is (are) —-
- (A) Temperature
- (B) Volume
- (C) Pressure and Mass of gas
- (D) Temperature and Mass of gas
20 The rate, at which work is done is called —–
- (A) Heat
- (B) Power
- (C) Sensible heat
- (D) None
21 When dry saturated steam is further heated, its dryness fraction
- (A) Increase
- (B) Decreases
- (C) Remains same
- (D) None
22 Rate of change of heat with respect to absolute temperature is called
- (A) Enthalpy
- (B) Entropy
- (C) Specific heat
- (D) None
23 A Carnot cycle machine operates between temperature limits of 47°C and – 30°C.find COP of pump
- (A) 4.156
- (B) 3.654
- (C) 1.342
- (D) None
24 The ratio of mass to volume is called —–
- (A) Specific volume
- (B) Weight density
- (C) Mass density
- (D) None of these
25 In which of the following systems does mass transfer occur across the system boundary?
- (A) isolated system
- (B) closed system
- (C) open system
- (D) none of the mentioned
26 Which of the following is chosen as the standard thermometric substance?
- (A) Liquid
- (B) Solid
- (C) Gas
- (D) None of the mentioned
27 Heat flow into a system is ____, and heat flow out of the system is ________
- (A) positive, positive
- (B) negative, negative
- (C) negative, positive
- (D) positive, negative
28 Which of the following is true according to Clausius statement?
- (A) it is possible to construct a device that can transfer heat from a cooler body to a hotter body without any effect
- (B) it is impossible to construct a device that can transfer heat from a cooler body to a hotter body without any effect
- (C) it is impossible to construct a device that can transfer heat from a hotter body to a cooler body without any effect
- (D) none of the mentioned
29 The enthalpy and internal energy are the function of temperature for
- (A) all gases
- (B) steam
- (C) Water
- (D) ideal gas
30 A heat engine takes in 750J of heat from a hot reservoir and produces 450J of work in each cycle. What is its efficiency?
- (A) 0.75
- (B) 0.3
- (C) 0.5
- (D) 0.6
31 The value of universal gas constant is
- (A) 8.2353
- (B) 8.3143
- (C) 8.5123
- (D) none of the mentioned
32 The perfect example of an ideal gas is
- (A) air
- (B) hydrogen
- (C) water vapour
- (D) none of the above
33 What parameter will remain constant in a throttling process?
- (A) Entropy
- (B) Temperature
- (C) Pressure
- (D) Enthalpy
34 The constant quantity of Boyle’s Law is
- (A) Only mass of the gas
- (B) Only temperature of a gas
- (C) Mass and Pressure of a gas
- (D) Mass and temperature of a gas
35 The constant quantity(s) in Charle’s Law is (are)-
- (A) Temperature
- (B) Volume
- (C) Pressure and Mass of gas
- (D) Temperature and Mass of gas
36 When water is heated with rise of temperature, it consumes
- (A) Latent heat
- (B) Enthalpy
- (C) Sensible heat
- (D) None
37 Water at atmospheric pressure is a
- (A) Ideal gas
- (B) Far below the critical temperature
- (C) Far above the critical temperature
- (D) None
38 With the increase of pressure, the boiling point of water
- (A) Increases
- (B) Decreases
- (C) No change
- (D) None
39 All steam engines work on
- (A) Zeroth law of thermodynamics
- (B) First law of thermodynamics
- (C) Second law of thermodynamics
- (D) None of these