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Total Questions : 1342 | Page 55 of 135 pages
Question 541.

.Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.


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


Question 542.

Reynolds number is the ratio of


  1.    energy transferred by convection to that by conduction
  2.    kinematic viscosity to thermal diffusivity
  3.    inertia force to viscous force
  4.    none of the above
 Discuss Question
Answer: Option C. -> inertia force to viscous force


Question 543.

The super-heating in a refrigeration cycle


  1.    does not alter C.O.P.
  2.    increases C.O.P.
  3.    decreases C.O.P.
  4.    none of these
 Discuss Question
Answer: Option C. -> decreases C.O.P.


Question 544.

During sensible heating of air, specific humidity remains constant.


  1.    Agree
  2.    Disagree
 Discuss Question
Answer: Option A. -> Agree


Question 545.

 
Air refrigeration cycle is used in


  1.    commercial refrigerators
  2.    domestic refrigerators
  3.    air-conditioning
  4.    gas liquefaction
 Discuss Question
Answer: Option D. -> gas liquefaction


Question 546.

 
Thermal conductivity of a material may be defined as the


  1.    quantity of heat flowing in one second through a slab of the material of area 1 cm2 and thickness 1 cm when its faces differ in temperature by `1^circ` C
  2.    quantity of heat flowing in one second through one cm of material when opposite faces are maintained at a temperature difference of `1^circ` C
  3.    heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above


Question 547.

The condition of refrigerant as it leaves the compressor in a vapour compression system is


  1.    saturated liquid
  2.    wet vapour
  3.    dry saturated vapour
  4.    superheated vapour
 Discuss Question
Answer: Option D. -> superheated vapour


Question 548.


The freezing point of carbon dioxide is equal to boiling point of R-12.


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


Question 549.


The radiation emitted by a black body is known as


  1.    black radiation
  2.    full radiation
  3.    total radiation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these


Question 550.


The sensible heat during humidification process decreases.


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


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