Question 1

Troubleshooting is a matter of progressing logically through a circuit.

Accepted Answer

Troubleshooting involves systematically analyzing a circuit or system to identify the source of a problem, which requires progressing logically through the components or steps of the circuit to isolate and fix the issue.

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

Accepted Answer

If the STOP button is open, it interrupts the circuit, preventing any contactor from being energized. Therefore, the motor would not run in the forward direction or any 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

Accepted Answer

An ohmmeter should be used on a circuit only when the power is disconnected to prevent damage to the meter and ensure accurate measurements.

Question 4

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

Accepted Answer

The answer of The three main instruments used by an...

Question 5

One definition of ____________________ is electrical pressure.

Accepted Answer

The answer of One definition of ____________________ is electrical pressure....

Question 6

What is the check, test, check procedure?

Accepted Answer

The answer of What is the check, test, check procedure?...

Question 7

What are some causes of an overheated overload relay?

Accepted Answer

The answer of What are some causes of an overheated...

Question 8

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

Accepted Answer

A control transformer can indeed be used to step down voltage from 240 volts to 120 volts, as it is designed to convert voltages to levels suitable for the control circuits they serve.

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

Accepted Answer

A control relay can be used to alternate between two pumps by remembering which pump was operated last, allowing for the control of the pumps in an alternating fashion.

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

Accepted Answer

A high limit thermostat is designed to turn off equipment, such as a pump motor, when the temperature exceeds a preset limit, ensuring safety and preventing damage from excessive heat.

Question 11

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

Accepted Answer

The answer of Speed control for a wound rotor motor...

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.

Accepted Answer

The answer of If an air induction blower fails for...

Question 13

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

Accepted Answer

The answer of What are some requirements for a two-pump...

Question 14

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

Accepted Answer

The answer of What are some requirements for a wound...

Question 15

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

Accepted Answer

The motor overload size is typically determined based on the motor's nameplate rating, which includes the full load current (FLC) that the motor is designed to draw at its rated voltage and frequency. This information is crucial for selecting the appropriate overload protection to prevent the motor from overheating due to excessive current.

Question 16

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

Accepted Answer

The full-load efficiency of a motor indicates how efficiently the motor converts electrical energy into mechanical energy when operating at its full load capacity, thus reflecting its overall efficiency under those conditions.

Question 17

Starter sizes are rated by motor type, ____, and connected voltage.
A) horsepower
B) disconnected voltage
C) overload
D) nameplate

Accepted Answer

Starter sizes are rated based on the motor type, horsepower, and connected voltage. Horsepower indicates the power output of the motor, which is crucial for selecting the appropriate starter size.

Question 18

How do you determine conductor size for a single motor?

Accepted Answer

The answer of How do you determine conductor size for...

Question 19

How do you determine locked rotor current?

Accepted Answer

The answer of How do you determine locked rotor current?...

Quiz 23: Troubleshooting, Motor Installation and Developing Control Circuits