CRT- Electrical

Question 1

Be sure power is off when checking circuits with an ohmmeter.

True
False

Answer 1

True

Question 2

Discharge capacitors with an insulated screwdriver before testing.

True
False

Answer 2

False

Question 3

Stand on dry, non-conductive surface when testing live circuits.

True
False

Answer 3

True

Question 4

Electrical meters are delicate test instruments; they should not be jolted or bumped.

True
False

Answer 4

True

Question 5

What three components make up a complete electrical circuit?

A. Power source, connecting wire, and electrical circuit
B. Voltage, resistance, and load
C. Power source, bimetallic switch, and a load
D. Power source, SPST switch, and load

Answer 5

A. Power source, connecting wiring, and electrical circuit

Question 6

The ohmmeter may explode if it comes in contact with line voltage.

True
False

Answer 6

True

Question 7

What is not a conductor of electricity?

A. Copper
B. Aluminum
C. Wood
D. Iron

Answer 7

C. Wood

Question 8

Ohm’s law establishes a mathematical relationship between voltage, amperage, and resistance.

True
False

Answer 8

True

Question 9

Which meter is seldom used to test an electrical circuit?

A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter

Answer 9

D. Wattmeter

Question 10

What meter is used to check for a grounded circuit?

A. Voltmeter
B. Wattmeter
C. Ammeter
D. Ohmmeter

Answer 10

D. Ohmmeter

Question 11

When is the most accurate meter reading obtained?

A. When the battery is new
B. On the highest possible scale
C. In the center two-thirds of the scale
D. On the lowest possible scale

Answer 11

C. In the center two-thirds of the scale

Question 12

What is a legend?

A. Drawing of the components in their approximate locations
B. Descriptive lists of the components
C. Drawing which represents a particular component
D. Drawing which uses symbols for circuit components

Answer 12

B. Descriptive lists of the components

Question 13

Which is NOT a load?

A. Incandescent bulb
B. Transformer
C. Capacitor
D. Coil

Answer 13

C. Copacitor

Question 14

The term “normally open” means the contact is open while the unit is operating.

True
False

Answer 14

False

Question 15

If the proper voltage is available to a load and it doesn’t operate, the load is probably defective.

True
False

Answer 15

True

Question 16

If proper voltage is NOT available to the load, the load is probably open.

True
False

Answer 16

False

Question 17

An electrical circuit consists of a power source, path for current flow and a load.

True
False

Answer 17

True

Question 18

Which is NOT a characteristic of a run capacitor?

A.more then 60 microfarad
B. Stays in the circuit
C. Is oil filled for cooling
D. Less then 60 microfarad

Answer 18

A. More then 60 microfarad

Question 19

What does the voltage rating of a capacitor tell the technician?

A. Voltage should not be higher
B. Voltage should not be lower
C. Voltage must be the same
D. Voltage can be +/- 20%

Answer 19

B. Voltage should not be lower

Question 20

Damage to the start winding may occur if the capacitor is improperly wired and becomes shorted.

True
False

Answer 20

True

Question 21

Witch is the national electric code requirement for circuit breakers that are less then 600 volts?

A. Shall be capable of automatic reset
B. Will have a visible “off” and “on” indication
C. Setting of tripping amperage requires dismantling
D. Shall be classified at not more then 100 amperes

Answer 21

A. Shall be capable of automatic reset

Question 22

The nation electric code does NOT require cartridge fuses of 30 amperes or less to be marked with a voltage rating.
True
False

Answer 22

False

Question 23

The national electrical code states that plug fuses shall NOT be used in circuits exceeding 125 Volts between conductors.

True
False

Answer 23

True

Question 24

Electrical motor windings are constructed with smaller wire than start windings.

True
False

Answer 24

False

Question 25

Electric motor supply voltage should be within 10% of data plate voltage. True False

Answer 25

True

Question 26

Like poles attract, while unlike poles repel. True False

Answer 26

False

Question 27

Which amperage would a motor draw when the rotor is not turning with power applied? A. Locked rotor amps (LRA) B. Starting amps (SA) C. Full load amps (FLA) D. Amps (A)

Answer 27

A. Locked rotor amps (LRA)

Question 28

When using an ohmmeter for testing, what reading indicates a good capacitor? A. Needle stays on infinity B. Needle swings toward zero and stays there C. Needle swings toward zero and slowly returns to infinity D. Needle swings towards zero and returns to a definite resistance

Answer 28

C. Needle swings towards zero and slowly returns to infinity

Question 29

When using an ohmmeter to test electric motors, what reading indicates it is OK? A. Needle swings toward zero and slowly returns to infinity B. Needle stays on infinity C. Needle swings to zero and stays D. Needle swings to a definite resistance and stays

Answer 29

D. Needle swings to a definite resistance and stays

Question 30

What causes most accidents? A. Dangerous equipment B. Old electrical wiring C. Rough or sharp materials D. Carelessness

Answer 30

D. Carelessness

Question 31

The human body is a good insulator of electrical current. True false

Answer 31

False