Unit Review Refrigeration Comprehensive Self-Assessment

Question 1

1. One of the two compartments in a window air conditioner contains the compressor,
\_\_\_\_\_ and the condenser fan.
A. Water cooled condensing coil
B. Water cooled evaporator coil
C. Air heated condenser coil
D. Air cooled condensing coil
E. Air cooled evaporator coil

Answer 1

D. Air cooled condensing coil

Question 2

2. What brine temperature is used when cooling an ice surface?
A. -11°C (12°F)
B. -5°C (23°F)
C. -18°C (0°F)
D. -25°C (-13°F)
E. -50°C (-58°F)

Answer 2

A. -11°C (12°F)

Question 3

3. Soft-solder fittings may only be used in refrigeration piping for tubing \_\_\_\_\_ O.D.
and smaller.
A. 25 mm (1 in)
B. 19 mm (¾ in)
C. 13 mm (½ in)
D. 32 mm (1¼ in)
E. 38 mm (1½ in)

Answer 3

C. 13 mm (½ in)

Question 4

4. An example of a unitary air conditioning system could be all of the following except
a:
A. Window air conditioner
B. Terminal reheater
C. Packaged air conditioner
D. Unit ventilator
E. Rooftop unit

Answer 4

B. Terminal reheater

Question 5

5. The function of the refrigeration condenser is to cool the superheated refrigerant
   vapour until it _____ and then becomes sub-cooled.
   A. Condenses to a vapour
   B. Evaporates to a liquid
   C. Evaporates to a vapour
   D. Freezes
   E. Condenses to a liquid

Answer 5

E. Condenses to a liquid

Question 6

6. One of the classes of closed cycle mechanical refrigeration systems is the: 
Book 2 PanGlobal Page 133
A. Condensation system
B. Absorption system
C. Evaporation system
D. Regeneration system
E. Expansion system

Answer 6

B. Absorption system

Question 7

7. The sides of atmospheric natural draft towers are \_\_\_\_\_ and airflows across the
tower by natural currents.
A. Louvred
B. Lowered
C. Sealed
D. Slanted
E. Solid

Answer 7

A. Louvred

Question 8

8. If a compressor discharge pressure gauge indicates 1120 kPa and the suction
   pressure is 70 kPa , what is the pressure ratio?
   A. 3.84
   B. 7.25
   C. 16
   D. 16.2
   E. 7.14

Answer 8

E. 7.14

Question 9

9. A simple closed-cycle compression refrigeration system does NOT contain which
of the following principal components?
A. Evaporator
B. Compressor
C. Condenser
D. Absorber
E. Liquid receiver

Answer 9

D. Absorber

Question 10

10.Refrigerants that are flammable and highly toxic belong to Group:
A. B3
B. A2
C. A3
D. B1
E. B2

Answer 10

E. B2

Question 11

11.A heat exchanger is used in a compression refrigerating system to transfer heat
from the relatively:
A. Cold liquid flowing to the evaporator
B. Warm liquid flowing to the condenser
C. Cold liquid flowing to the condenser
D. Warm vapour flowing to the evaporator
E. Warm liquid flowing to the evaporator

Answer 11

E. Warm liquid flowing to the evaporator

Question 12

12.One tonne of refrigeration is equal to the equivalent of the heat needed to:
Book 2 PanGlobal Page 134
A. Melt 1 tonne (1000 kg) of ice at a temperature of 0°C in 12 hours
B. Melt 1 tonne (1000 kg) of ice at a temperature of 0°C in 24 hours
C. Melt ½ tonne (500 kg) of ice at a temperature of 0°C in 24 hours
D. Melt 1 tonne (1000 kg) of ice at a temperature of 10°C in 24 hours
E. Melt 1 tonne (1000 kg) of ice at a temperature of 100°C in 24 hours

Answer 12

B. Melt 1 tonne (1000 kg) of ice at a temperature of 0°C in 24 hours

Question 13

13.What is the term used to describe the device used on a centrifugal chiller to
improve efficiency and provide an intercooling effect?
A. Compressor
B. Economizer
C. Expansion valve
D. Condenser
E. Evaporator

Answer 13

B. Economizer

Question 14

14.A larger residence, located in an area with colder winters would require a more
complex system to maintain satisfactory conditions on a year-round basis including
all except:
A. Heating
B. Filtration
C. Ventilation
D. Humidification
E. Cooling

Answer 14

E. Cooling

Question 15

15.Refrigerants that are non-toxic and non-flammable belong to Group:
A. A1
B. A2
C. A3
D. B1
E. B2

Answer 15

A. A1

Question 16

16.The compression ratio is calculated by dividing the:
A. Discharge gauge pressure by the Suction gauge pressure
B. Absolute discharge pressure by the suction gauge pressure
C. Discharge gauge pressure by the absolute suction pressure
D. Absolute discharge pressure by the absolute suction pressure
E. Absolute suction pressure by the absolute discharge pressure

Answer 16

D. Absolute discharge pressure by the absolute suction pressure

Question 17

17.The most common central air conditioning system is the:
A. Terminal reheat system
B. Dual duct system
C. Forced air furnace
D. Multi-zone system
E. Roof top unit

Answer 17

C. Forced air furnace

Question 18

18.One of the general types of condensers is the \_\_\_\_\_ condenser.
A. Flooded
Book 2 PanGlobal Page 135
B. Dry
C. Air-cooled
D. Direct expansion
E. Bare tube

Answer 18

C. Air-cooled

Question 19

19.One of the basic designs of water-cooled condensers is the \_\_\_\_\_ condenser:
A. Flooded
B. Double tube
C. Direct expansion
D. Bare tube
E. Evaporative

Answer 19

B. Double tube

Question 20

20.The amount of liquid refrigerant admitted to a dry or direct-expansion type
evaporator by the flow control or expansion valve is only that amount needed to
maintain the required \_\_\_\_\_ the coil.
A. Superheat in the vapour leaving
B. Superheat in the vapour entering
C. Pressure in the vapour leaving
D. Pressure in the liquid leaving
E. Superheat in the liquid leaving

Answer 20

A. Superheat in the vapour leaving