To Review

Question 1

When measuring the voltage on an electrical load, connect the meter . . . The load.

Answer 1

In parallel with the load

Question 2

When measuring the current through an electrical load, connect the meter . . . The load.

Answer 2

In series with the load.

Question 3

When measuring the resistance of an electrical load, connect the meter. . . The load.

Answer 3

In parallel with the load.

Question 4

As little as ___ milliamp leaking out of a circuit will cause a GFCI to open.

Answer 4

6 mA

Question 5

T/F: the apparent power of a circuit can equal its true power if the circuit is purely resistive.

Answer 5

True

Question 6

As the diameter of a wire increases, the resistance of the wire . . .

Answer 6

Decreases

Question 7

Power factor, true power/apparent power x . . .

Answer 7

100

Question 8

Which gasket is most important on a reciprocating compressor?

Answer 8

Valve plate gasket

Question 9

A condenser removes the ___ from refrigerant vapor.

Answer 9

Heat of condensation
Heat of evaporation
Enthalpy of vaporization

Question 10

On finned evaporator coils the prime surface would be the:

Answer 10

The tube

Question 11

Rule of thumb for how many BTU are rejected per hr

Answer 11

??

Question 12

It is generally considered good practise to limit the compressions ratio for reciprocating compressors to:

Answer 12

10:1

Question 13

When the load on the evaporator increases, the TX valve. . .

Answer 13

Increases the flow of refrigerant

Question 14

Capacity control is normally required for air cooled condensers if ambient temp drops below:

Answer 14

55*F

Question 15

Specific volume is a term used to:

Answer 15

Indicate the space a weight of gas will occupy

Question 16

To calculate specif enthalpy, divide a substances total enthalpy by its:

Answer 16

Mass

Question 17

A ____ motor is a single phase induction motor that has a start capacitor wired in series with the start winding.

Answer 17

Capacitor-start, induction-run

Question 18

Electric motors are rated at their operating speed, which is called . . .

Answer 18

Full load speed

Question 19

T/F electric motors are rated at synchronous speed

Answer 19

False

Question 20

T/F most 2 hole recepticles are grounded.

Answer 20

True

Question 21

T/F A square type axial blade is best suited for free air applications, such as pedestal fans.

Answer 21

False

Question 22

A low pressure motor control monitors suction (low side) pressure at the. . .

Answer 22

Compressor

Question 23

T/F secondary controls are used to start and stop the compressor when certain temp or pressures are reached.

Answer 23

False

Question 24

T/F the low pressure motor control is the preferred choice on residential systems.

Answer 24

False.