HVAC ELECTRICAL ESCO QUESTIONS WITH ACCURATE
ANSWERS
A capacitor analyzer is designed to read:
a. The percentage of leakage.
b. The capacitor voltage.
c. The capacitive resistance of a capacitor.
d. The capacitance of a capacitor. correct answer d. The capacitance of a
capacitor.
A device with overload protection used to control a motor is a:
a. Relay.
b. Contactor.
c. Selenium rectifier.
d. Line starter. correct answer d. Line starter.
A diode is used to:
a. Control the direction of electron flow.
b. Increases inductive reactance.
C. Convert DC current to AC current.
d. Increase or decrease frequency. correct answer a. Control the direction of
electron flow.
,A is commonly used on a single phase
capacitor start fractional horse power compressor motor to disconnect the start
winding after the motor starts.
a. Lock out relay.
b. NTC thermistor.
C. Kinetic relay.
d. Current relay. correct answer d. Current relay.
A solenoid valve coil operates on the principle of:
a. Pressure differential.
b. Temperature differential.
C. Electromagnetism.
d. Time and temperature. correct answer C. Electromagnetism.
A step up transformer increases.
a. Power.
b. Voltage.
C. Resistance.
d. Amperage. correct answer b. Voltage.
A three phase load requires a minimum of:
, a. Three supply lines.
b. Two supply lines and a ground.
C. Three supply lines and a neutral.
d. Two supply lines. correct answer a. Three supply lines.
A transducer can create a signal based on:
a. Time.
b. Turbulence.
c. The specific gravity of the refrigerant.
d. Pressure. correct answer d. Pressure.
A transformer has 1000 turns of wire in the primary coil and 500 turns in the
secondary coil. If 120 volts are applied, the output voltage will be:
a. 120 KV.
b. 620 volts.
c. 60 volts.
d. 240 volts. correct answer c. 60 volts.
A typical thermocouple used on a gas furnace can:
a. Generate a small AC electrical current.
b. Be used to power a shaded pole motor.
C. Generate a small DC electrical current.
ANSWERS
A capacitor analyzer is designed to read:
a. The percentage of leakage.
b. The capacitor voltage.
c. The capacitive resistance of a capacitor.
d. The capacitance of a capacitor. correct answer d. The capacitance of a
capacitor.
A device with overload protection used to control a motor is a:
a. Relay.
b. Contactor.
c. Selenium rectifier.
d. Line starter. correct answer d. Line starter.
A diode is used to:
a. Control the direction of electron flow.
b. Increases inductive reactance.
C. Convert DC current to AC current.
d. Increase or decrease frequency. correct answer a. Control the direction of
electron flow.
,A is commonly used on a single phase
capacitor start fractional horse power compressor motor to disconnect the start
winding after the motor starts.
a. Lock out relay.
b. NTC thermistor.
C. Kinetic relay.
d. Current relay. correct answer d. Current relay.
A solenoid valve coil operates on the principle of:
a. Pressure differential.
b. Temperature differential.
C. Electromagnetism.
d. Time and temperature. correct answer C. Electromagnetism.
A step up transformer increases.
a. Power.
b. Voltage.
C. Resistance.
d. Amperage. correct answer b. Voltage.
A three phase load requires a minimum of:
, a. Three supply lines.
b. Two supply lines and a ground.
C. Three supply lines and a neutral.
d. Two supply lines. correct answer a. Three supply lines.
A transducer can create a signal based on:
a. Time.
b. Turbulence.
c. The specific gravity of the refrigerant.
d. Pressure. correct answer d. Pressure.
A transformer has 1000 turns of wire in the primary coil and 500 turns in the
secondary coil. If 120 volts are applied, the output voltage will be:
a. 120 KV.
b. 620 volts.
c. 60 volts.
d. 240 volts. correct answer c. 60 volts.
A typical thermocouple used on a gas furnace can:
a. Generate a small AC electrical current.
b. Be used to power a shaded pole motor.
C. Generate a small DC electrical current.
