Hi guys today we are learning about the Multiple choice questions With answers Refrigeration and air conditioning so let's start,
Multiple choice questions With answers Refrigeration and air conditioning
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| Multiple choice questions With answers Refrigeration and air conditioning |
Q.no.1) In refrigeration cycle, heat is rejected by refrigerant in a
A : Expansion valve
B : Compressor
C : Condenser
D : Evaporator
Answer:- (C)
Q.no.2) Cp of air is
A : Greater than Cv of air
B : Equal to Cv of air
C : Less than Cv of air
D : None
Answer:-(C)
Q.no.3) Due to inter-cooling in multistage refrigeration, COP
A : Increases
B : Decreases
C : Remains same
D : None of the above
Answer:- (A)
Q.no.4) A fan is required in an air conditioning duct to overcome____________.
A :Total pressure
B : Dynamic pressure
C : Static pressure
D : Equivalent pressure
Answer:- (A)
Q.no.5)Which one acts as a primary, secondary as well as a tertiary refrigerant
A : Water
B : Ammonia
C : Freon-22
D : None
Answer:-(D)
Q.no.6) Q.no 9. Using intercooling in multi-stage compression systems
A: Refrigeration effect can be increased
B:Maximum cycle temperature can be increased
C: Work of compression in higher stage compressor can be reduced
D: All of the above.
Answer:-(C)
Q.no.7) The use of a flash chamber in a multi-stage vapor compression refrigeration
A : Decreases the COP
B : Increases the COP
C : neither increases or decreases the COP
Answer:- (A)
Q.no.8) The process generally used in winter airconditioning is known as _________
A: Humidification
B : Heating and humidification
C : dehumidification
D : cooling and dehumidification
Answer:- (B)
Q.no.9) Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle
A : Capillary tube
B : Throttling valve
C : Either throttling valve or capillary tube
D : Compressor
Answer:-(C)
Q.no.10) What is the process carried out in generator of vapour absorption refrigeration cycle
A : Only water is heated and heat is given to the ammonia to form its vapour
B : Weak solution of ammonia in water is heated
C : Strong solution of ammonia in water is heated
D : None of the above
Answer:-(C)
Q.no.11) Sling psychrometer is used to measure:
A : Only wet bulb temperature
B : Only dry bulb temperature
C : Dry and Wet bulb temperature
D : Relative humidity
Answer:- (C)
Q.no12) Bare tube evaporator is used in a
A : Cold storage plant
B : ice plant
C : milk Plant
D : Fridge
Answer:-(B)
Q.no.13) Finned tube evaporators are used in a
A : Window air conditioner
B :Water cooler
C : Fridge
D :Heat pump
Answer:- (A)
Q.no.14) Which compressor is used, when volume flow rate of refrigerant is very large?
A :- Srew compressor
B :- : Rotary compressor
C: Reciprocating compressor
D: Centrifugal compressor
Answer:- (D)
Q.no.15) In a duct fan compared to forward curved blades, backward curved blades are more
efficient. This statement is ________.
A : depends on types of fan
B : False
C : True
D : Can’t predict
Answer:- (C)
Q.no.16) The boiling point of ammonia is
A : -30°C
B : -33.3°C
C : -77.7°C
D : -10.5°C
Answer:- (B)
Q.no.17) domestic refrigerator if compressor runs continuously, it shows that
A : system is working perfectly right
B : The refrigeration is to full capacity
C : The system is overloaded
D : Lack of oil
Answer:- (C)
Q.no.18) The fluids used in the Electrolux refrigerator are
A : Water and hydrogen
B : Ammonia and hydrogen
C : Ammonia, water and hydrogen
D : Water and Ammonia
Answer:- (C)
Q.no.19) Forced air cooled condenser in refrigeration unit has a
A : parallel flow
B : counter flow
C : can not say
D : cross flow
Answer:- (D)
Q.no.20) For rectangular duct the aspect ratio is equal to
A : Sum of longer and shorter sides
B : product of longer and shorter sides
C : ratio of longer and shorter sides
D : difference of longer and shorter
sides
Answer:- (C)
Q.no.20) The Psychrometric chart used to
determine
a) Thermal conductivity of materials
b) Heat transfer coefficients
c) Properties of air-water vapor mixtures
d) Refrigerant properties
Answer: (C)
Q.no.21) Which of following refrigerants is classified as hydrochlorofluorocarbon
a) R22
b) R134a
c) R410a
d) R290
Answer: (A)
Q.no.22) What is the primary function of a refrigeration system?
A) To increase the temperature of the environment
B) To transfer heat from a low-temperature space to a high-temperature space
C) To convert heat energy into mechanical energy
D) To cool water for drinking purposes
Answer: (B) To transfer heat from a low-temperature space to a high-temperature space
Q.no.23) Which refrigerant is commonly used in domestic refrigerators?
A) Ammonia (NH3)
B) R-134a
C) R-744 (CO2)
D) Sulfur dioxide
Answer: B) R-134a
Q.no.24) The unit of refrigeration is expressed in:
A) Joules
B) Kelvin
C) Tons of refrigeration (TR)
D) Watts
Answer: C) Tons of refrigeration (TR)
Q.no.25) Which component in a refrigeration system is responsible for compressing the refrigerant?
A) Condenser
B) Compressor
C) Evaporator
D) Expansion valve
Answer: B) Compressor
Q.no.26) What is the function of the evaporator in a refrigeration system?
A) To compress the refrigerant
B) To absorb heat from the refrigerated space
C) To release heat to the surroundings
D) To expand the refrigerant
Answer: B) To absorb heat from the refrigerated space
So in this lecture we discuss the Multiple choice questions With answers Refrigeration and air conditioning hope you understand well.
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