1050B Progress test

Question 1

What are devices that convert electrical energy to another form of energy?

Answer 1

Loads

Question 2

What is the first test used when troubleshooting electrical problems?

Answer 2

Check the power supply

Question 3

True or False: When making voltage or resistance checks on a compressor, place your leads directly on the compressor terminals.

Answer 3

False

Question 4

What type of troubleshooting technique starts from the line or control voltage side of the circuit and works toward the load device?

Answer 4

Systematic or Logical troubleshooting

Question 5

Is a crankcase heater an inductive or resistive load?

Answer 5

Resistive

Question 6

Is a contactor coil an inductive or resistive load?

Answer 6

Inductive

Question 7

Is a compressor motor an inductive or resistive load?

Answer 7

Inductive

Question 8

Is an electric heater element an inductive or resistive load?

Answer 8

Resistive

Question 9

Is a transformer an inductive or resistive load?

Answer 9

Inductive

Question 10

Is a gas valve an inductive or resistive load?

Answer 10

Inductive

Question 11

True or False: When a voltmeter is placed across a load, it will read the applied voltage, regardless of whether the load is good or bad.

Answer 11

True

Question 12

When making a continuity measurement of a switch, a 0 ohm reading indicates the switch is open or closed?

Answer 12

Closed

Question 13

While taking resistance measurements on a hermetic compressor, you read 30,000 ohms from the compressor casing to the starting terminal. Is the compressor good or bad?

Answer 13

Bad (indicates a grounded winding)

Question 14

Contacts that are closed when the contactor or relay is energized are called normally what?

Answer 14

Normally open

Question 15

Name the three terminals on a single-phase compressor.

Answer 15

Common, Start, Run

Question 16

How to determine common, start, and run from resistance readings?

Answer 16

• Highest resistance = Start to Run
• Middle = Start to Common
• Lowest = Run to Common

Question 17

The correct way to discharge a capacitor, if necessary, is to use:

Answer 17

20,000-ohm 2-watt resistor

Question 18

What is not an advantage of low voltage control circuit?

Answer 18

Lower current (incorrect because current increases as voltage decreases for same power)

Question 19

Most important thing to know before troubleshooting?

Answer 19

Understand the system operation and schematic

Question 20

True or False: Bypassing or overriding a safety control is okay until a replacement is found.

Answer 20

False

Question 21

True or False: Before making resistance measurements, isolate the component by disconnecting at least one lead.

Answer 21

True

Question 22

When making a continuity measurement of a switch, an infinite reading indicates the switch is open or closed?

Answer 22

Open

Question 23

After checking 240V with ohm scale, meter stops working—what’s the problem?

Answer 23

You damaged the meter by applying voltage while set to resistance

Question 24

Contacts that open when the contactor or relay is energized are called normally ____?

Answer 24

Normally closed

Question 25

A schematic diagram always shows contacts in what state?

Answer 25

De-energized state

Question 26

Behind which terminal is the overload located in a hermetic compressor?

Answer 26

Common

Question 27

When checking for grounds, use a high or low ohm scale?

Answer 27

High ohm scale