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Second Half Book 2 > chapter 24 > Flashcards

chapter 24 Flashcards

1
Q

The bimetal element thermostat produces mechanical when subjected to _____ changes.
Select one:

A.
Pressure

B.
Electronic

C.
Electrical

D.
Temperature

E.
Humidity

A

D.
Temperature

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2
Q

One of the most important secondary controls in a refrigerating system is the refrigerant flow control used to regulate the amount of liquid refrigerant flowing into the:
Select one:

A.
Condenser

B.
Refrigerator

C.
Evaporator

D.
Refrigerated space

E.
Receiver

A

C.
Evaporator

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3
Q

The sensing device of a humidistat may consist of a/an _____ element.
Select one:

A.
Hydrophobic

B.
Hydroponic

C.
Hygroscopic

D.
Hydroscopic

E.
Pneumatic

A

C.
Hygroscopic

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4
Q

The thermostatic refrigeration controller has a differential adjustment that sets the temperature at which the:
Select one:

A.
Fan starts and stops

B.
Level in the evaporator control activates

C.
Condenser cooling water control activates

D.
Expansion valve opens and closes

E.
Cut-in and cut-out occurs

A

E.
Cut-in and cut-out occurs

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5
Q

The thermostatic refrigeration controller produces mechanical when subjected to _____ fluctuations in the cooled medium.
Select one:

A.
Electrical

B.
Humidity

C.
Temperature

D.
Electronic

E.
Pressure

A

C.
Temperature

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6
Q

The high motor temperature cutout stops the compressor if there is a loss of motor cooling or a motor overload due to malfunction of the:
Select one:

A.
Low limit thermostat

B.
Condenser cooling water regulating valve

C.
Operating controls

D.
High oil temperature cutout

E.
High-pressure safety cutout

A

C.
Operating controls

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7
Q

With the indirect type of temperature-actuated refrigeration control the bulb is installed in the _____ while the remainder of the control is located outside in a convenient location.
Select one:

A.
Condenser

B.
Receiver

C.
Evaporator

D.
Refrigerator

E.
Refrigerated space

A

E.
Refrigerated space

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8
Q

The operation of the compressor (starting, stopping, and unloading) is usually accomplished by a _____ type of actuated control.
Select one:

A.
Temperature

B.
Density

C.
Level

D.
Mass

E.
Volume

A

A.
Temperature

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9
Q

Motor overload protection is a manual reset device that will take the motor itself offline when the current drawn by the motor exceeds:
Select one:

A.
The condenser maximum allowable pressure

B.
Its maximum allowable oil temperature

C.
Its minimum allowable value

D.
Its maximum allowable value

E.
The evaporator maximum allowable temperature

A

D.
Its maximum allowable value

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10
Q

An evaporator pressure regulator prevents _____ conditions from occurring in the evaporator while the compressor is running.
Select one:

A.
High pressure and temperature

B.
Low pressure and humidity

C.
High pressure and low temperature

D.
Low pressure and high temperature

E.
Low pressure and temperature

A

E.
Low pressure and temperature

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11
Q

In the event of a low oil pressure condition, the oil pressure failure switch will:
Select one:

A.
Stop the air circulation fan

B.
Stop the flow of refrigerant to the system

C.
Sound an audible alarm

D.
Open the recycle valve to take the load off the compressor

E.
Shutdown the compressor

A

E.
Shutdown the compressor

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12
Q

The condenser automatic cooling water regulating valve is operated by the:
Select one:

A.
Liquid pressure on the compressor suction

B.
Vapour pressure on the compressor suction

C.
Liquid pressure on the compressor discharge

D.
Vapour pressure on the evaporator discharge

E.
Vapour pressure on the compressor discharge

A

E. Vapour pressure on the compressor discharge

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13
Q

The operation of the compressor (starting, stopping, and unloading) may be accomplished by a _____ type of actuated control.
Select one:

A.
Density

B.
Level

C.
Humidity

D.
Volume

E.
Mass

A

C.
Humidity

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14
Q

A pressure-actuated refrigeration control cannot be used in conjunction with a/an _____ expansion valve
Select one:

A.
Automatic

B.
Solenoid

C.
Hand

D.
Humidity

E.
Thermostatic

A

A.
Automatic

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15
Q

The CSA B52 Mechanical Refrigeration Code requires the pressure limiting device to be connected between the:
Select one:

A.
Compressor and the first stop valve in the suction line

B.
Condenser and the first stop valve in the discharge line

C.
Condenser and the first stop valve in the suction line

D.
Evaporator and the first stop valve in the discharge line

E.
Compressor and the first stop valve in the discharge line

A

E.
Compressor and the first stop valve in the discharge line

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16
Q

The low oil sump temperature protection device prevents the compressor from starting if the oil temperature falls below a preset value so that:
Select one:

A.
The oil will drain from the condenser

B.
The oil will drain from the evaporator

C.
The oil will flow freely

D.
The oil viscosity will be low enough

E.
Any refrigerant dissolved in the oil is separated from the lubricant.

A

E.
Any refrigerant dissolved in the oil is separated from the lubricant.

17
Q

The CSA B52 Mechanical Refrigeration Code requires that the pressure limiting device be designed to stop the action of the compressor or generator at a pressure not more than _____ of the system high side design pressure.
Select one:

A.
90%

B.
80%

C.
70%

D.
60%

E.
100%

A

A.
90%

18
Q

The _____ is used in those systems where a drop in temperature below the minimum setting of the operating thermostat could result in damage to the equipment.
Select one:

A.
Solenoid valve

B.
Pressure limiting device

C.
Low limit thermostat

D.
Pressure-operated safety switch

E.
Evaporator pressure regulator

A

C.
Low limit thermostat

19
Q

With the direct type of temperature-actuated refrigeration control the thermostat is located directly in the:
Select one:

A.
Receiver

B.
Evaporator

C.
Space to be cooled

D.
Condenser

E.
Refrigerator

A

C.
Space to be cooled

20
Q

The pressure-actuated refrigeration control is actuated by the:
Select one:

A.
Discharge pressure of the compressor

B.
Suction pressure of the condenser

C.
Discharge pressure of the receiver

D.
Suction pressure of the compressor

E.
Suction temperature of the compressor

A

D.
Suction pressure of the compressor

21
Q

The high-pressure safety cutout protects the refrigerating system from higher than normal pressures due to the:
Select one:

A.
Presence of refrigerants in the system

B.
Presence of non-condensables in evaporator

C.
Loss of refrigerant

D.
High compressor oil pressure

E.
Presence of non-condensables in the system

A

E.
Presence of non-condensables in the system

22
Q

One of the three distinct classes of refrigeration controls is the _____ control.
Select one:

A.
Humidity actuated

B.
Cooling water regulating

C.
Limiting and safety

D.
Solenoid

E.
Condenser fan

A

C.
Limiting and safety

23
Q

The solenoid valve is operated by a/an _____ signal.
Select one:

A.
Electronic

B.
Electrical

C.
Temperature

D.
Pressure

E.
Humidity

A

B.
Electrical

24
Q

Flow switches are used on chilled water and cooling water lines and air ducts are used as _____ switches.
Select one:

A.
Evaporator level control

B.
Low temperature lockout

C.
Over pressure lockout

D.
Safety lockout

E.
Condenser pressure control

A

D.
Safety lockout

25
Q

One of the three distinct classes of refrigeration controls is the _____ control.
Select one:

A.
Operating or primary

B.
Condenser temperature

C.
Cooling water regulating

D.
Low oil pressure

E.
Condenser fan

A

A.
Operating or primary

26
Q

The thermostatic refrigeration controller has a range adjustment that sets the temperature level at which the:
Select one:

A.
Cut-in and cut-out occurs

B.
Level in the evaporator control activates

C.
Expansion valve opens and closes

D.
Condenser cooling water control activates

E.
Fan starts and stops

A

A.
Cut-in and cut-out occurs

27
Q

The operation of the compressor (starting, stopping, and unloading) is usually accomplished by a _____ type of actuated control.
Select one:

A.
Pressure

B.
Density

C.
Mass

D.
Volume

E.
Level

A

A.
Pressure

28
Q

The operation of the compressor (starting, stopping, and unloading) may be accomplished by a _____ type of actuated control.
Select one:

A.
Mass

B.
Level

C.
Volume Humidity

D.
Temperature

E.
Density

A

D.
Temperature

29
Q

The CSA B52 Mechanical Refrigeration Code requires that all refrigeration systems containing more than _____ kg of refrigerant and operating above atmospheric pressure shall be equipped with a pressure limiting device.
Select one:

A.
5 kg (11 lb)

B.
15 kg (33.1 lb)

C.
20 kg (44.1 lb)

D.
12 kg (26.4 lb)

E.
9 kg (19.8 lb)

A

E.
9 kg (19.8 lb)

30
Q

The pressure-operated safety switch is used to protect the refrigeration system against a lower than normal _____ pressure.
Select one:

A.
Condenser cooling water

B.
Compressor suction

C.
Evaporator suction

D.
Condenser suction

E.
Condenser discharge

A

B.
Compressor suction

Second Half Book 2 (15 decks)

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