Flashcards in NATE Electrical Exam Deck (12)
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
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
A voltmeter is connected into a circuit in which of the following ways?
A low pressure control is usually located on the..
A. Condensing unit
A high pressure control is usually located on the...
A. Condensing unit
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
Which of the following is a safety control?
B. High pressure control
C. Low pressure control
High pressure control
Low voltage controls are usually designed to operate at no more than...
A. 25 volts
B. 80 volts
C. 120 volts
D. 230 volts
A unit of power equal to one horse power and delivered at the shaft of a motor is known as...
B. Brake horse power
C. Horse power
Brake horse power
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
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
D. Trip armature