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MCQs

Total Questions : 1058 | Page 101 of 106 pages
Question 1001. Which of the following is the correct statement?
  1.    Irreversible engines have maximum efficiency.
  2.    All the reversible and irreversible engines have the same efficiency.
  3.    All the reversible engines have the same efficiency.
  4.    All engines are designed as reversible in order to obtain maximum efficiency.
 Discuss Question
Answer: Option A. -> Irreversible engines have maximum efficiency.
Question 1002. Which is the incorrect statement about Carnot cycle?
  1.    All the heat engines are based on Carnot cycle
  2.    All of these
  3.    It is used as the alternate standard of comparison of all heat engines
  4.    It provides concept of maximising work output between the two temperature limits
 Discuss Question
Answer: Option A. -> All the heat engines are based on Carnot cycle
Question 1003. The compression ratio for petrol engines is
  1.    3 to 6
  2.    5 to 8
  3.    10 to 20
  4.    15 to 30
 Discuss Question
Answer: Option B. -> 5 to 8
Question 1004. Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant
  1.    Pressure
  2.    Internal energy
  3.    Volume
  4.    Temperature
 Discuss Question
Answer: Option A. -> Pressure
Question 1005. One kilowatt is equal to
  1.    100 N-m
  2.    1 × 106 N-m/s
  3.    1000 N-m/s
  4.    1 N-m/s
 Discuss Question
Answer: Option C. -> 1000 N-m/s
Question 1006. Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant
  1.    Internal energy
  2.    Pressure
  3.    Volume
  4.    Temperature
 Discuss Question
Answer: Option C. -> Volume
Question 1007. The mass of excess air supplied is equal to
  1.    (23/100) × Mass of excess carbon
  2.    (100/23) × Mass of excess oxygen
  3.    (23/100) × Mass of excess oxygen
  4.    (100/23) × Mass of excess carbon
 Discuss Question
Answer: Option B. -> (100/23) × Mass of excess oxygen
Question 1008. The work ratio of a gas turbine plant is given by
  1.    (Net work output)/(Work-done by the turbine)
  2.    (Actual temperature drop)/(Isentropic temperature drop)
  3.    (Net work output)/(Heat supplied)
  4.    (Isentropic increase in temperature)/(Actual increase in temperature)
 Discuss Question
Answer: Option A. -> (Net work output)/(Work-done by the turbine)
Question 1009. A definite area or a space where some thermodynamic process takes place is known as
  1.    Thermodynamic cycle
  2.    Thermodynamic process
  3.    Thermodynamic law
  4.    Thermodynamic system
 Discuss Question
Answer: Option D. -> Thermodynamic system
Question 1010. An ideal gas as compared to a real gas at very high pressure occupies
  1.    More volume
  2.    Unpredictable behavior
  3.    Same volume
  4.    Less volume
 Discuss Question
Answer: Option A. -> More volume

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