Deck 5: Refrigeration and Air Conditioning System Components and Processes

Question 1

In the expansion process, which of the following remains constant?

A)work done
B)heat supplied
C)internal energy
D)enthalpy

Answer 1

enthalpy

Question 2

The COP of cycle is given by(q²=heat absorbed by evaporator and Wc=work done by compressor)

A)1- (q²/wc)
B)1- (wc/q²)
C)q²/wc
D)wc/q²

Answer 2

q²/wc

Question 3

Which of the following is recommended in a refrigeration cycle?

A)superheating of vapour
B)subcooling of liquid
C)both of the mentioned
D)none of the mentioned

Answer 3

both of the mentioned

Question 4

A condenser must and then the compressed refrigerant.

A)superheat, evaporate
B)desuperheat, evaporate
C)superheat, condense
D)desuperheat, condense

Question 5

In absorption refrigeration cycle, which of the following is used?

A)refrigerant
B)absorbent
C)both of the mentioned
D)none of the mentioned

Question 6

In absorption system, compressor in vapour compression cycle is replaced by absorber- generator assembly.

Question 7

In the aqua-ammonia absorption system,

A)water is the refrigerant and ammonia is the absorbent
B)ammonia is the refrigerant and water is the absorbent
C)both ammonia and water can be used as refrigerant or absorbent
D)none of the mentioned

Question 8

Which of the following statement is true?

A)ammonia vapour is absorbed in water
B)boiling point of ammonia is more than that of water
C)both of the mentioned
D)none of the mentioned

Question 9

Which of the following condenses first?

A)ammonia vapour
B)water vapour
C)both condense at same temperature
D)none of the mentioned

Question 10

The vapour going to condenser is in temperature and in ammonia.

A)higher, less
B)higher, richer
C)lower, less
D)lower, richer

Question 11

Lithium bromide-water vapour is another absorption refrigeration system.

Question 12

Water is used as a in air conditioning units.

A)absorbent
B)refrigerant
C)absorbent and refrigerant
D)none of the mentioned

Question 13

Room air conditioners and packaged units are examples of______________

A)direct expansion systems
B)indirect expansion systems
C)chilled water systems
D)indirect contraction systems

Question 14

Which of the following is not a component of packaged air conditioners?

A)compressor
B)condenser
C)chiller
D)evaporator

Question 15

In a chilled water system, the refrigerant is used to cool the air directly while in the direct expansion system, a secondary medium like water is used to cool the air.

Question 16

In which component of the chilled water system, the return air and the fresh air mixture is filtered?

A)fan coil unit
B)ducting grill
C)compressor
D)evaporator

Question 17

Which of the following qualities is not possessed by the filters in the air conditioning system?

A)they should be capable of removing dust particles from the incoming air
B)they should afford easy cleaning
C)they should offer low frictional resistance to the airflow
D)they should offer high frictional resistance to the airflow

Question 18

Which of the following statements about electric precipitators is false?

A)they are used to remove dust by providing a strong electric field
B)their initial installation cost is high
C)their operational cost is low
D)dust particles get attached to the positive electrode

Question 19

The process of extraction of the certain required amount of water from air is known as______________    

A)heating
B)cooling
C)humidification
D)dehumidification

Question 20

Which of the following is capable of absorbing excess moisture from the air?

A)silica gel
B)charcoal
C)salts of calcium or ammonia
D)activated alumina

Question 21

Open cooling system is also called as

A)parallel system
B)once through system
C)air based system
D)non-reversible system

Question 22

How many number of spray nozzle does each module on spray pond cooling system contains?

A)1
B)2
C)3
D)4

Question 23

Which of the following is the simplest method of cooling the condenser water?

A)spray cooling pond
B)cooling tower
C)indirect air cooling
D)hyperbolic cooling tower

Question 24

In which type of cooling system are nozzles arranged on different elevation?

A)single deck system
B)double deck system
C)natural flow system
D)direct flow system