Thermal Engineering

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
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
2   Everything outside the system is called —–
    (A)   Boundary
    (B)   System
    (C)   Surrounding
    (D)   None of the mentioned
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
3   Heat is a —– Grade energy
    (A)   High
    (B)   Low
    (C)   Medium
    (D)   None of above
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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)
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
5   The sum of internal energy and product of pressure and volume is called…..
    (A)   Entropy
    (B)   Enthalpy
    (C)   Density
    (D)   ideal gas
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
7   The first law of thermodynamics doesn’t tell us whether a thermodynamic process is feasible or not.
    (A)   TRUE
    (B)   FALSE
    (C)  
    (D)  
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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%
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
10   The steady flow energy equation: Q = (h1 – h2) is applicable for?
    (A)   Nozzle
    (B)   Turbine
    (C)   Compressor
    (D)   Condenser
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
15   What parameter will remain constant in an Isothermal process?
    (A)   Entropy
    (B)   Temperature
    (C)   Pressure
    (D)   Enthalpy
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
20   The rate, at which work is done is called —–
    (A)   Heat
    (B)   Power
    (C)   Sensible heat
    (D)   None
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
21   When dry saturated steam is further heated, its dryness fraction
    (A)   Increase
    (B)   Decreases
    (C)   Remains same
    (D)   None
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
22   Rate of change of heat with respect to absolute temperature is called
    (A)   Enthalpy
    (B)   Entropy
    (C)   Specific heat
    (D)   None
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
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
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
24   The ratio of mass to volume is called —–
    (A)   Specific volume
    (B)   Weight density
    (C)   Mass density
    (D)   None of these
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
26   Which of the following is chosen as the standard thermometric substance?
    (A)   Liquid
    (B)   Solid
    (C)   Gas
    (D)   None of the mentioned
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
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
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
29   The enthalpy and internal energy are the function of temperature for
    (A)   all gases
    (B)   steam
    (C)   Water
    (D)   ideal gas
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
31   The value of universal gas constant is
    (A)   8.2353
    (B)   8.3143
    (C)   8.5123
    (D)   none of the mentioned
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
32   The perfect example of an ideal gas is
    (A)   air
    (B)   hydrogen
    (C)   water vapour
    (D)   none of the above
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
33   What parameter will remain constant in a throttling process?
    (A)   Entropy
    (B)   Temperature
    (C)   Pressure
    (D)   Enthalpy
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
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
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
36   When water is heated with rise of temperature, it consumes
    (A)   Latent heat
    (B)   Enthalpy
    (C)   Sensible heat
    (D)   None
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
37   Water at atmospheric pressure is a
    (A)   Ideal gas
    (B)   Far below the critical temperature
    (C)   Far above the critical temperature
    (D)   None
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
38   With the increase of pressure, the boiling point of water
    (A)   Increases
    (B)   Decreases
    (C)   No change
    (D)   None
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
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
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]

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