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Free download in PDF Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
Allowable pressure on high-pressure side or ammonia absorption system is of the order of
[A]
atmospheric pressure
[B]
slightly above atmospheric pressure
[C]
2-4 bars
[D]
5-6 bars
(2)
The vapour compression refrigerator employs the following cycie
[A]
Reversed Carnot
[B]
Rankine
[C]
Carnot
[D]
Reversed Rankine
(3)
In S.J. unit, one ton of refrigeration is equal to
[A]
210 kJ/min
[B]
21 kJ/min
[C]
420 kJ/min
[D]
840 kJ/min
(4)
One ton refrigeratiqn corresponds to
[A]
50 kcal/min
[B]
50 kcal/kr
[C]
80 kcal/min
[D]
80 kcal/hr
(5)
One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice
[A]
in 1 hour
[B]
in 1 minute
[C]
in 24 hours
[D]
in 12 hours
(6)
The boiling point of ammonia is
[A]
-100°C
[B]
-50°C
[C]
- 33.3°C
[D]
0°C
(7)
vapour compression cycle the condition off refrigerant is dry saturated vapour
[A]
after passing through the condenser
[B]
before passing through the condenser
[C]
after passing through the expansion or throttle valve
[D]
before entering the compressor.
Answer: before entering the compressor.
(8)
In vapour compression cycle the condition of refrigerant is superheated vapour
[A]
after passing through the condenser
[B]
before passing through the condenser
[C]
after passing through the expansion or throttle valve
[D]
before [entering the expansion valve
Answer: before passing through the condenser
(9)
In vapour compression cycle, the condition of refrigerant is high pressure saturated liquid
[A]
before entering the expansion valve
[B]
after passing through the expansion or thiottle valve
[C]
after passing through the condenser
[D]
before passing through the condenser
Answer: before entering the expansion valve
(10)
In vapour compression cycle, the condition of refrigerant is very wet vapour
[A]
after passing through the condenser
[B]
before passing through the condenser
[C]
before entering the compressor
[D]
after passing through the expansion or throttle valve
Answer: before entering the compressor
(11)
In vapour compression cycle, the conditii of refrigerant is saturated liquid
[A]
after passing through the condenser
[B]
before passing through the condensei
[C]
after passing through the expansion throttle valve
[D]
before entering the expansion valve
Answer: after passing through the condenser
(12)
Clapeyron equation is applicable for registration at
[A]
saturation point of vapour
[B]
saturation point of liquid
[C]
sublimation temperature
[D]
triple point
Answer: saturation point of vapour
(13)
Clapeyron equation is a relation between
[A]
temperature, pressure, specific volur and'enthalpy.
[B]
temperature, pressure, and specil volume
[C]
specific volume and enthalpy
[D]
temperature, pressure and enthalpy
Answer: temperature, pressure, specific volur and'enthalpy.
(14)
The relative coefficient of performance is
[A]
actual COP/fheoretical COP
[B]
theoretical COP/actual COP
[C]
actual COP x theoretical COP
[D]
1-actual COP x theoretical COP
Answer: actual COP/fheoretical COP
(15)
An important characteristic of absorption system of refrigeration is
[A]
noisy operation
[B]
quiet operation
[C]
cooling below 0°C
[D]
very little power consumption
(16)
Ammonia-absorption refrigeration cycle requires
[A]
very little work input
[B]
maximum work input
[C]
nearly same work input as for vapour compression cycle
[D]
zero work input
Answer: very little work input
(17)
Which of the following cycles uses air as the refrigerant
[A]
Ericsson
[B]
Stirling
[C]
Carnot
[D]
Bell-coleman
(18)
Vapour compression refrigeration is some what like
[A]
Carnot cycle
[B]
Rankine cycle
[C]
reversed Camot cycle
[D]
none of the above
Answer: none of the above
(19)
A standard ice point temperature corresponds to the temperature of
[A]
water at 0°C
[B]
ice at - 4°C
[C]
solid and dry ice
[D]
mixture of ice and water Under equilibrium conditions.
Answer: mixture of ice and water Under equilibrium conditions.
(20)
Pick up the wrong statement. A refrigerant should have
[A]
Tow specific heat of liquid
[B]
high boiling point
[C]
high latent heat of vaporisation
[D]
higher critical temperature
Answer: high boiling point
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