Quiz #4

Question 1

If the illustrated motor fails to start and gives a loud hum
when the start button is pushed, the problem is
__________. EL-0007

Answer 1

one of the phases to
the motor is not
energized because
of an open motor
lead

Question 2

If the motor fails to start and a voltmeter reading between 1 and 6, as illustrated, indicates line voltage, your next step should be to __________. EL-0007

Answer 2

reset and determine
the cause of the
overload

Question 3

The motor starts when the start button in the illustration
is pushed, but stops when the button is released the
trouble is __________. EL-0007

Answer 3

a faulty holding relay

contact ‘Ma’

Question 4

The illustrated motor fails to start and gives a loud hum
when the start button is depressed, your first action
should be to __________. EL-0007

Answer 4

push the stop button
to de-energize the
“M” coil

Question 5

In the illustrated motor controller, the motor fails to start. A voltmeter reading between 1 and 6 reads line voltage, while the voltmeter reading between 2 and 6 reads 0 VAC. The problem is __________. EL-0007

Answer 5

the stop switch is

open

Question 6

What type of electrical control diagram is shown in the illustration? EL-0007

Answer 6

schematic diagram

Question 7

If the circuit shown in the illustration were energized and operating properly, which of the devices listed would be open? EL-0007

Answer 7

The start push-button

Question 8

The wiring diagram for the motor starting circuit shown in the illustration indicates __________. EL-0007

Answer 8

low voltage protection

Question 9

The schematic diagram shown in the illustration uses symbol “A” to represent a/an __________. EL-0011

Answer 9

thermal overload heater

Question 10

Referring to the illustrated schematic diagram, which of
the following statements is true when the motor is
running in the forward direction? EL-0011

Answer 10

Current flows through
the ‘Reverse’ push-button
switch.

Question 11

If the three-phase motor, shown in the illustrated
schematic diagram, is running in the forward direction, which of the following actions must occur before the motor will reverse rotation? EL-0011

Answer 11

‘L1’ and ‘L3’ must be
interchanged via the
“R” contacts.

Question 12

If the supply voltage is 220 volts 60 Hz, what is the
operating voltage of the motor controller circuitry
illustrated? EL-0011

Answer 12

220 volts AC

Question 13

What operational characteristics do the components labeled as “S” and “R” represent in the motor controller diagram shown in the illustration? EL-0080

Answer 13

Start and Run

functions

Question 14

Which two components, shown in the illustration, acting together will disconnect the motor from the line in case of a sustained motor overload? EL-0080

Answer 14

“E” and “I”

Question 15

Which device will stop the motor shown in the illustration in case of a short-circuit (high current) motor
overload? EL-0080

Answer 15

“F”

Question 16

Which component will stop the motor shown in the

illustration in case of an overload in the control circuit? EL-0080

Answer 16

“G”

Question 17

Which of the listed types of motor controllers and starters is illustrated? EL-0080

Answer 17

Autotransformer

Question 18

If the line voltage to the controller shown in the
illustration is 440 volts, what is applied across the
control circuit? EL-0080

Answer 18

440 volts

Question 19

If the line voltage to the controller shown in the illustration is 440 volts, what is applied voltage to the motor when in the ‘START’ mode? EL-0080

Answer 19

??

Question 20

If the line voltage to the controller shown in the illustration is 440 volts, what is applied voltage to the motor when in the ‘RUN’ mode? EL-0080

Answer 20

??