Question 1: Which of the following is the unit of conductance?
- Ohm
- Mho
- Ampere
- Volts
HVAC
NEC 2023
HVAC Basic Electrical Questions -1
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HVAC electrical exams cover electrical theory (Ohm's Law, circuits), transformers, single-phase and three-phase motors, control wiring, safety, and troubleshooting.
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TimeHVAC Basic Electrical Questions -1 — Question List
Question 2: Which of the following current does a battery produces?
- Direct current
- Alternating current
Question 3: In electrical system the ammeter is used to measure?
- Current
- Voltage
- Resistance
- Power
Question 4: If the resistance of the circuit is decreases keeping the voltage same, what happens to the current in the circuit?
- Increases
- Decreases
- Remains same
Question 5: Which of the electrical quantities are used in sizing of electrical fuses?
- Volt and amps
- Volt and power
- Current and power
- Current and ohms
Question 6: The resistance in circuit is the indication of …………………
- How much opposition to current flow
- How much EMF applied to circuit
- How many coulombs crossed at a point in one second
- Electrical pressure in the circuit
Question 7: Which of the following measuring equipment uses its own power source?
- Ohmmeter
- Voltmeter
- Ammeter
- Watt meter
Question 8: If two capacitors are connected in parallel with one having 20 mfd and second one with 10 mfd. What is its equivalent capacitance?
- 30 mfd
- 6.6 mfd
- 10 mfd
- 20 mfd
Question 9: If a voltmeter connected across two terminals indicates the maximum reading, what does it mean?
- The two terminals are shorted
- The two terminals are opened
- The two terminals are in series
- The two terminals are in parallel
Question 10: In parallel circuit the current flow will be same.
- True
- False
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