MCQ Questions Mechanical Engineering Steam Boilers, Engines, Nozzles and Turbines
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MCQ Questions Mechanical Engineering Steam Boilers, Engines, Nozzles and Turbines - Set - 4
Question 1:
Mechanical equivalent of heat for 1 kcal or Joule’s equivalent is equal to
(a) 421 kgm
(b) 421 kgm
(c) 539 kgm
(d) 102 kgm
Correct Answer – (A)
Question 2 :
Pick up the wrong statement about critical condition of steam
(a) latent heat is zero
(b) liquid directly becomes steam
(c) specific volume of steam and liquid is same
(d) this is the maximum pressure limit
Correct Answer – (D)
Question 3 :
Adiabatic process is
(a) essentially an isentropic process
(b) non-heat transfer process
(c) reversible process
(d) constant temperature process
Correct Answer – (B)
Question 4 :
While steam expands in turbines, theoretically the entropy
(a) remains constant
(b) increases
(c) decreases
(d) behaves unpredictably
Correct Answer – (A)
Question 5 :
At which pressure the properties of water and steam become identical
(a) 0.1 kg/cm2
(b) 1 kg/cm2
(c) 100 kg/cm2
(d) 225.6 kg/cm2
Correct Answer – (D)
MCQ Questions Mechanical Engineering Steam Boilers, Engines, Nozzles and Turbines
Question 6:
Water boils when its vapour pressure
(a) equals that of the surroundings
(b) equals 760 mm of mercury
(c) equals to atmospheric pressure
(d) equals the pressure of water in the container
Correct Answer – (A)
Question 7:
The state of vapour under saturation condition is described by
(a) pressure alone
(b) temperature alone
(c) pressure and temperature
(d) pressure and dryness fraction
Correct Answer – (D)
Question 8:
Heating wet steam at constant temperature is heating it at constant
(a) volume
(b) pressure
(c) entropy
(d) enthalpy
Correct Answer – (B)
Question 9:
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
(a) 40%
(b) 25%
(c) 50%
(d) 80%
Correct Answer – (D)
Question 10:
The latent heat of steam with increase of pressure
(a) remains same
(b) increases
(c) decreases
(d) behaves unpredictably
Correct Answer – (C)
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