Refrigeration and Air Conditioning Quiz | Refrigeration and Air Conditioning Multiple Choice Questions and Answers

Questions
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

Answer: 5-6 bars
2 The vapour compression refrigerator employs the following cycie
A Reversed Carnot
B Rankine
C Carnot
D Reversed Rankine

Answer: Reversed Carnot
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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

Answer: 210 kJ/min
4 One ton refrigeratiqn corresponds to
A 50 kcal/min
B 50 kcal/kr
C 80 kcal/min
D 80 kcal/hr

Answer: 50 kcal/min
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

Answer: in 24 hours
6 The boiling point of ammonia is
A -100°C
B -50°C
C - 33.3°C
D 0°C

Answer: - 33.3°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

Answer: quiet operation
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

Answer: 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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