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Flashcards in NATE Electrical Exam Deck (12)
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1

What electro-mechanical control would you use on a cap tube or automatic expansion valve system to maintain the space temperature?
A. A dual pressure control
B. A low pressure control
C. A thermostatic control
D. A high pressure control

A thermostatic control

2

Open motors are designed to operate at a given temperature rise as indicated on the motor nameplate. What does this mean?
A. Indicates the temp rise over the surrounding air of a motor when the motor is operating at full load conditions
B. Indicates the temp rise of the motor
C. Indicates the temp drop of the surrounding air
D. Indicates the temp drop of the motor at rest

Indicates the temp rise over the surrounding air of a motor when the motor is operating at full load conditions

3

A voltmeter is connected into a circuit in which of the following ways?
A. Series
B. Parallel
C. Series-parallel
D. Delta

Parallel

4

A low pressure control is usually located on the..
A. Condensing unit
B. Evaporator
C. Cabinet
D. Blower

Condensing unit

5

A high pressure control is usually located on the...
A. Condensing unit
B. Evaporator
C. Cabinet
D. Blower

Condensing unit

6

The term "nominal voltage" refers to...
A. The actual voltage
B. The measured voltage
C. The average voltage
D. The listed voltage

The listed voltage

7

Which of the following is a safety control?
A. Thermostat
B. High pressure control
C. Low pressure control
D. Humidistat

High pressure control

8

Low voltage controls are usually designed to operate at no more than...
A. 25 volts
B. 80 volts
C. 120 volts
D. 230 volts

25 volts

9

A unit of power equal to one horse power and delivered at the shaft of a motor is known as...
A. Amperage
B. Brake horse power
C. Horse power
D. Voltage

Brake horse power

10

What is the purpose of the holding circuit in a magnetic motor starter?
A. Holds the main contacts open until the control circuit through the interlock is made
B. Holds the main contacts closed until the control circuit through the interlock is broken
C. Holds the main contacts open until the control circuit
D. Holds the main contact closed until the control circuit through the interlock is made

Holds the main contacts closed until the control circuit through the interlock is broken

11

On a magnetic motor starter, the alloy piece that causes the motor starter to open and shut off the motor if too much motor current is drawn is called the...
A. Holding current
B. Heater
C. Relay
D. Trip armature

Trip armature

12

A set of contacts in a pressure control that closes when the pressure increases are...
A. Direct acting
B. Reverse acting
C. Duel acting
D. None of these

Direct acting