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MCQs

Total Questions : 1342 | Page 60 of 135 pages
Question 591.

 
Which of the following statement is correct?


  1.    A grey body is one which absorbs all radiations incident on it.
  2.    At thermal equilibrium, the emissivity and absorptivity are same.
  3.    The energy absorbed by a body to the total energy falling on it, is called emissivity.
  4.    A perfect body is one which is black in colour.
 Discuss Question
Answer: Option B. -> At thermal equilibrium, the emissivity and absorptivity are same.


Question 592.


In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in


  1.    parallel flow
  2.    counter flow
  3.    cross flow
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 593.

The wet bulb temperature at 100% relative humidity is __________ dew point temperature.


  1.    same as
  2.    lower than
  3.    higher than
 Discuss Question
Answer: Option A. -> same as


Question 594.

 
The use of heat exchangers is made in


  1.    radiators in automobile
  2.    condensers and boilers in steam plants
  3.    condensers and evaporators in refrigeration and air conditioning units
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above


Question 595.

 
The transfer of heat from one body to another takes place only when there is a temperature difference between the bodies.


  1.    Yes
  2.    No
 Discuss Question
Answer: Option A. -> Yes


Question 596.


Which of the following statement is correct for ammonia as a refrigerant?


  1.    It is toxic to mucous membranes.
  2.    it requires large displacement per TR compared to fluoro carbons.
  3.    It reacts with copper and its alloys.
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 597.

At 100% relative humidity, wet bulb temperature, dry bulb temperature,
dew point temperature and saturation temperature are equal.


  1.    Correct
  2.    Incorrect
 Discuss Question
Answer: Option A. -> Correct


Question 598.

 
Bell-Coleman cycle is a


  1.    reversed Carnot cycle
  2.    reversed Otto cycle
  3.    reversed Joule cycle
  4.    reversed Rankine cycle
 Discuss Question
Answer: Option C. -> reversed Joule cycle


Question 599.

 
Sulphur dioxide is extremely toxic and non-flammable.


  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True


Question 600.


The natural convection air cooled condensers are used in


  1.    domestic refrigerators
  2.    water coolers
  3.    room air conditioners
  4.    all of these
 Discuss Question
Answer: Option A. -> domestic refrigerators


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