To Review Flashcards
When measuring the voltage on an electrical load, connect the meter . . . The load.
In parallel with the load
When measuring the current through an electrical load, connect the meter . . . The load.
In series with the load.
When measuring the resistance of an electrical load, connect the meter. . . The load.
In parallel with the load.
As little as ___ milliamp leaking out of a circuit will cause a GFCI to open.
6 mA
T/F: the apparent power of a circuit can equal its true power if the circuit is purely resistive.
True
As the diameter of a wire increases, the resistance of the wire . . .
Decreases
Power factor, true power/apparent power x . . .
100
Which gasket is most important on a reciprocating compressor?
Valve plate gasket
A condenser removes the ___ from refrigerant vapor.
Heat of condensation
Heat of evaporation
Enthalpy of vaporization
On finned evaporator coils the prime surface would be the:
The tube
Rule of thumb for how many BTU are rejected per hr
1.25
It is generally considered good practise to limit the compressions ratio for reciprocating compressors to:
10:1
When the load on the evaporator increases, the TX valve. . .
Increases the flow of refrigerant
Capacity control is normally required for air cooled condensers if ambient temp drops below:
55*F
Specific volume is a term used to:
Indicate the space a weight of gas will occupy
To calculate specif enthalpy, divide a substances total enthalpy by its:
Mass
A ____ motor is a single phase induction motor that has a start capacitor wired in series with the start winding.
Capacitor-start, induction-run
Electric motors are rated at their operating speed, which is called . . .
Full load speed
T/F electric motors are rated at synchronous speed
False
T/F most 2 hole recepticles are grounded.
True
T/F A square type axial blade is best suited for free air applications, such as pedestal fans.
False
A low pressure motor control monitors suction (low side) pressure at the. . .
Compressor
T/F secondary controls are used to start and stop the compressor when certain temp or pressures are reached.
False
T/F the low pressure motor control is the preferred choice on residential systems.
False.
A type of control device that closes an electrical circuit on temp rise.
Above atmospheric pressure element
A type of control device that opens on an electrical circuit on temp rise.
Below atmospheric pressure element
