Deck 23: Troubleshooting, Motor Installation and Developing Control Circuits

Question 1

Troubleshooting is a matter of progressing logically through a circuit.

Answer 1

True

Question 2

If the STOP button were open, the motor would ____.

A) have an energized forward contactor
B) have a de-energized reverse contactor
C) run in the forward direction
D) not run in the forward direction

Answer 2

not run in the forward direction

Question 3

When using an ohmmeter, make certain that the ____.

A) reverse contactor is energized
B) forward contactor is energized
C) power is connected to the circuit
D) power is disconnected from the circuit

Answer 3

power is disconnected from the circuit

Question 4

The three main instruments used by an electrician to troubleshoot a circuit are the voltmeter, ohmmeter, and ____________________.

Question 5

One definition of ____________________ is electrical pressure.

Question 6

What is the check, test, check procedure?

Question 7

What are some causes of an overheated overload relay?

Question 8

A control transformer cannot be used to change incoming voltage from 240 volts to 120 volts.

Question 9

If pump 1 is to operate alternately with pump 2, some method must be devised to remember which pump operated last. This function is performed by a(n) ____.

A) short circuit protector
B) control relay
C) resistor
D) overload protector

Question 10

Which of the following can turn a pump motor off if the temperature of the heat exchanger should become excessive?

A) resistor
B) air inductor
C) high limit thermostat
D) control transformer

Question 11

Speed control for a wound rotor motor is obtained by placing ____________________ in the secondary or rotor circuit.

Question 12

If an air induction blower fails for some reason other than the overload contact opening, the high-pressure pump motor will continue to inject oil into the combustion chamber. To prevent this situation, a(n) ____________________ switch can be added to the circuit.

Question 13

What are some requirements for a two-pump motor circuit?

Question 14

What are some requirements for a wound rotor induction motor speed control circuit?

Question 15

The motor overload size is to be determined by the nameplate rating of the motor.

Question 16

The full-load efficiency indicates the overall efficiency of the motor.

Question 17

Starter sizes are rated by motor type, ____, and connected voltage.

A) horsepower
B) disconnected voltage
C) overload
D) nameplate

Question 18

How do you determine conductor size for a single motor?

Question 19

How do you determine locked rotor current?