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MCQs

Total Questions : 1058 | Page 105 of 106 pages
Question 1041. A diathermic wall is one which
  1.    Permits thermal interaction
  2.    Discourages thermal interaction
  3.    Prevents thermal interaction
  4.    Encourages thermal interaction
 Discuss Question
Answer: Option A. -> Permits thermal interaction
Question 1042. The amount of heat required to raise the temperature of the unit mass of gas through one degree at constant volume, is called
  1.    Specific heat at constant pressure
  2.    None of these
  3.    Specific heat at constant volume
  4.    Kilo Joule
 Discuss Question
Answer: Option C. -> Specific heat at constant volume
Question 1043. Otto cycle efficiency is higher than Diesel cycle efficiency for the same compression ratio and heat input because in Otto cycle
  1.    Heat rejection is lower
  2.    Expansion and compression are isentropic
  3.    Combustion is at constant volume
  4.    Maximum temperature is higher
 Discuss Question
Answer: Option A. -> Heat rejection is lower
Question 1044. Which of the following processes is irreversible process?
  1.    All of these
  2.    Adiabatic
  3.    Isothermal
  4.    Throttling
 Discuss Question
Answer: Option D. -> Throttling
Question 1045. The molecular mass expressed in gram (i.e. 1 g - mole) of all gases, at N. T. P., occupies a volume of
  1.    224 liters
  2.    0.224 liters
  3.    2.24 liters
  4.    22.4 liters
 Discuss Question
Answer: Option D. -> 22.4 liters
Question 1046. An adiabatic wall is one which
  1.    Discourages thermal interaction
  2.    Prevents thermal interaction
  3.    Permits thermal interaction
  4.    Encourages thermal interaction
 Discuss Question
Answer: Option B. -> Prevents thermal interaction
Question 1047. Minimum work in compressor is possible when the value of adiabatic index ‘n’ is equal to
  1.    1
  2.    0.75
  3.    1.27
  4.    1.35
 Discuss Question
Answer: Option A. -> 1
Question 1048. No liquid can exist as liquid at
  1.    273°K
  2.    Zero pressure
  3.    Vacuum
  4.    Centre of earth
 Discuss Question
Answer: Option B. -> Zero pressure
Question 1049. Which of the following cycles has maximum efficiency?
  1.    Stirling
  2.    Brayton
  3.    Carnot
  4.    Rankine
 Discuss Question
Answer: Option C. -> Carnot
Question 1050. The polytropic index (n) is given by
  1.    log (p1p2)/log (v1v2)
  2.    log (p2/ p1)/log (v1/ v2)
  3.    log (v1/ v2)/ log (p1/p2)
  4.    log [(p1v1)/(p2v2)]
 Discuss Question
Answer: Option B. -> log (p2/ p1)/log (v1/ v2)

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