Question 1

When using an ohmmeter, make certain that the ____.

Accepted Answer

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

Question 2

How do you determine locked rotor current?

Accepted Answer

There are two basic methods for determining the locked rotor current (starting current) of a squirrel-cage induction motor, depending on the information available.
 If the motor nameplate lists code letters that range from A to V, they indicate the type of rotor bars used when the rotor was made. Different types of bars are used to make motors with different operating characteristics. The type of rotor bars largely determines the maximum starting current of the motor. NEC Table 430.7(B) lists the different code letters and gives the locked-rotor kilovolt-amperes per horsepower. The starting current can be determined by multiplying the kilovolt-ampere rating by the horsepower rating and then dividing by the applied voltage.
 The second method of determining locked rotor current is to use Tables 430.251(A) and (B) if the motor nameplate lists NEMA design codes. Table 430.251(A) lists the locked rotor currents for single-phase motors and Table 430.251(B) lists the locked rotor currents for poly-phase motors.

Question 3

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

Accepted Answer

resistance

Question 4

One definition of ____________________ is electrical pressure.

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

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

Question 7

Troubleshooting is a matter of progressing logically through a circuit.

Accepted Answer

A) True 
 B)False

Question 8

What are some causes of an overheated overload relay?

Accepted Answer

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

Question 9

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 10

How do you determine conductor size for a single motor?

Accepted Answer

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

Question 11

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 12

What is the check, test, check procedure?

Accepted Answer

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

Question 13

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) ____.

Accepted Answer

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

Question 14

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

Accepted Answer

A) True 
 B)False

Question 15

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 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Exam 23: Troubleshooting, Motor Installation and Developing Control Circuits

When using an ohmmeter, make certain that the ____.

How do you determine locked rotor current?

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

One definition of ____________________ is electrical pressure.

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

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

Troubleshooting is a matter of progressing logically through a circuit.

What are some causes of an overheated overload relay?

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

How do you determine conductor size for a single motor?

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.

What is the check, test, check procedure?

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

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

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

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

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

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