71-80

Question 0

72

Answer 0

DC line circuit breaker or contactor

Used to close and interrupt a d-c power circuit under normal conditions and/or to interrupt this circuit under emergency conditions.

Question 1

71

Answer 1

DC line emergency circuit breaker or contactor

Used to interrupt a d-c power circuit under emergency conditions, such as overspeed.

Question 2

73

Answer 2

Load resistor circuit breaker or contactor

Used to shunt or insert a step of load limiting, shifting, or indicating resistance in a power circuit, or to switch a space heater in circuit.

Question 3

74

Answer 3

Alarm relay

One other than an annunciator used to operate, or to operate in connection with a visual or audible alarm.

Question 4

75

Answer 4

Position changing mechanism

Used for moving a removable circuit breaker unit to and from the connected, disconnected, and test positions.

Question 5

76

Answer 5

Dc over-current relay

Functions when the current in a d-c circuit exceeds a given value

Question 6

77

Answer 6

Impulse transmitter

Generate and transmit impulses over a telemetering or pilot wire circuit to the remote indicating or receiving device

Question 7

78

Answer 7

Phase-angle measuring relay

Functions at a predetermined phase angle between voltages or currents.

Question 8

79

Answer 8

A-C re closing relay controls the reclosing and locking out of an a-c circuit interrupter

Question 9

80

Answer 9

D-C under-voltage relay or device

Functions on a given value of d-c under voltage