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Total Questions : 1342 | Page 57 of 135 pages
Question 561.

 
In a boot-strap air evaporative cooling system, the evaporator is provided


  1.    between the combustion chamber and the first heat exchanger
  2.    between the first heat exchanger and the secondary compressor
  3.    between the secondary compressor and the second heat exchanger
  4.    between the second heat exchanger and the cooling turbine
 Discuss Question
Answer: Option D. -> between the second heat exchanger and the cooling turbine


Question 562.


When the
temperature of the surrounding is higher than the temperature of the
body, then the heat loss by convection from the body to the surrounding
will be


  1.    positive
  2.    negative
  3.    zero
  4.    none of these
 Discuss Question
Answer: Option B. -> negative


Question 563.

The alignment circle is marked on the psychrometric chart at


  1.    `20^circ`C DBT and 50% RH
  2.    `26^circ`C DBT and 50% RH
  3.    `20^circ`C DBT and 60% RH
  4.    `26^circ`C DBT and 60% RH
 Discuss Question
Answer: Option B. -> `26^circ`C DBT and 50% RH


Question 564.

 
The C.O.P. of a Carnot refrigerator in winter will be __________ as compared to C.O.P. in summer.


  1.    same
  2.    lower
  3.    higher
 Discuss Question
Answer: Option C. -> higher


Question 565.

.The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to


  1.    Stanton number
  2.    Biot number
  3.    Peclet number
  4.    Grashoff number
 Discuss Question
Answer: Option A. -> Stanton number


Question 566.

Which of the following statement is correct?`


  1.    The human body can lose heat even if its temperature is less than the atmospheric temperature.`
  2.    The increase in air movement increases the evaporation from the human body.
  3.    The warm air increases the rate of radiation of heat from the human body.
  4.    both (a) and (b)
 Discuss Question
Answer: Option D. -> both (a) and (b)


Question 567.


The index which
corelates the combined effects of air temperature, relative humidity and
air velocity on the human body, is known as


  1.    mean radiant temperature
  2.    effective temperature
  3.    dew point temperature
  4.    none of these
 Discuss Question
Answer: Option B. -> effective temperature


Question 568.


The minimum temperature to which water can be cooled in a cooling tower is


  1.    dew point temperature of air
  2.    wet bulb temperature of air
  3.    dry bulb temperature of air
  4.    ambient air temperature
 Discuss Question
Answer: Option B. -> wet bulb temperature of air


Question 569.

The superheated vapour region, in a pressure enthalpy chart, is represented by the space


  1.    to the left of saturated liquid line
  2.    to the right of saturated liquid line
  3.    between the saturated liquid line and saturated vapour line
  4.    none of the above
 Discuss Question
Answer: Option C. -> between the saturated liquid line and saturated vapour line


Question 570.

The operating pressure for refrigerating units using R-12 as a refrigerant is


  1.    2 bar
  2.    8 bar
  3.    15 bar
  4.    30 bar
 Discuss Question
Answer: Option B. -> 8 bar


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