HVAC NEC 2023

HVAC Basic Electrical Questions -3

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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.

Requirements vary by state. HVAC technicians typically need EPA 608 certification and may need a separate electrical license for line voltage work.
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HVAC Basic Electrical Questions -3
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HVAC Basic Electrical Questions -3 — Question List

Question 1: Which of the following instrument detects the bubbles in refrigerant liquid line?

  • Megger
  • Electronic sight glass
  • Electronic charging meter
  • Halogen leak detector

Question 2: The battery cells connected in series produces …………..

  • Higher voltages
  • Higher currents
  • High power
  • High resistance

Question 3: A fuse in the electrical circuit protects the circuit from ……………..

  • Excess power
  • Excess current
  • Excess voltage
  • Excess impedance

Question 4: In parallel resistive network the voltage applied is equal to sum of voltages across the each individual resistor?

  • True
  • False

Question 5: Which of the following is the symbol of impedance?

  • Z
  • I
  • R
  • V

Question 6: What is the power flow in a circuit, if a 50 coulombs moved at a point in 20 seconds with an applied voltage of 8 Volts?

  • 3.2 watts
  • 20 watts
  • 8 watts
  • 8 watts

Question 7: Which of the following is produced around the conductor if an electric current passes through it?

  • Magnetic field
  • Negative field
  • Static field
  • Capacitance field

Question 8: 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 9: Which of the following batteries action provides electricity?

  • Chemical
  • Electrical
  • Mechanical
  • Hydroelectric

Question 10: An ohm meter cannot simple connected to …………….

  • Coil
  • Motor winding
  • Resistor
  • Energized circuit
EXAM CARD HVAC
Questions10
Time limit15 min
Pass score70%
Code editionNEC 2023
DifficultyIntermediate

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