Quiz #4 Flashcards Preview

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Flashcards in Quiz #4 Deck (20):
1

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

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

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

reset and determine
the cause of the
overload

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

a faulty holding relay
contact 'Ma'

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

push the stop button
to de-energize the
"M" coil

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

the stop switch is
open

6

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

schematic diagram

7

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

The start push-button

8

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

low voltage protection

9

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

thermal overload heater

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

Current flows through
the 'Reverse' push-button
switch.

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

'L1' and 'L3' must be
interchanged via the
"R" contacts.

12

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

220 volts AC

13

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

Start and Run
functions

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

"E" and "I"

15

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

"F"

16

Which component will stop the motor shown in the
illustration in case of an overload in the control circuit? EL-0080

"G"

17

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

Autotransformer

18

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

440 volts

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

??

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

??