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HVAC Electrical Test Questions With Correct Answers.
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HVAC Electrical Test Questions With Correct Answers.
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HVAC ELECTRICALHVAC Electrical Test Questions
With Correct Answers.
A _____________ is commonly used on a single phase fractional horse power compressor motor to
disconnect the start winding after the motor starts - ✔✔✔ - Current relay
A 240 volt, 3 wire circuit can be split into two 120 volt circuits. - ✔✔✔ - TRUE
A capacitor analyzer is designed to read; - ✔✔✔ - the capacitance of a capacitor
A device with over load protection used to control a motor is a; - ✔✔✔ - line starter
A diode is used to; - ✔✔✔ - Control the direction of electron flow.
A parallel circuit consists of three resistors
R1=30 ohms R2=15 ohms R3=10ohms
if the current through R2=4 amperes, what is the source voltage? - ✔✔✔ - 60 volts
A parallel circuit contains a 18 ohm and 9 ohm resistor. The total resistance equals; - ✔✔✔ - 6
ohms
A solenoid valve coil operates on the principle of; - ✔✔✔ - Electromagnetism
A step up transformer increases; - ✔✔✔ - voltage
HVAC ELECTRICAL Page 1
, HVAC ELECTRICAL
A three phase load requires a minimum of; - ✔✔✔ - three supply lines
A transducer can create a signal based on; - ✔✔✔ - pressure
A transformer has 1,000 turns of wire in the primary coil and 2,000 turns in the secondary coil. If
120 volts are applied, the output voltage will be; - ✔✔✔ - 240 volts
A transformer has 1,000 turns of wire in the primary coil and 500 turns in the secondary coil. If
120 volts are applied, the output voltage will be; - ✔✔✔ - 60 volts
A typical thermocouple used on a gas furncae can - ✔✔✔ - Generate a smalll DC electrical
current
An electron has - ✔✔✔ - a negative charge
An electronically commutated motor (ECM) is Designed to - ✔✔✔ - provide proper air flow
under various conditions.
An ohmmeter should never be connected to - ✔✔✔ - a live circuit
Any material that will readily release electrons is called - ✔✔✔ - a conductor
Capacitors are always connected __________ to the start winding - ✔✔✔ - in series
Capacitors are rated in: - ✔✔✔ - Microfarads & Volts
HVAC ELECTRICAL Page 2
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