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and Controls Maintenance Exam
Question 1. What does Ohm’s Law state in electrical circuits? A) Voltage is equal to current divided by resistance B) Voltage is equal to current multiplied by resistance C) Voltage is equal to resistance divided by current D) Voltage is equal to power multiplied by current Answer: B Explanation: Ohm’s Law states that Voltage (V) = Current (I) × Resistance (R). Question 2. In a series circuit, how does the current behave? A) It splits equally among all branches B) It remains the same through all components
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C) It is zero in all components D) It only flows through the component with the least resistance Answer: B Explanation: In a series circuit, the current is the same through every component. Question 3. Which law explains the conservation of charge at a junction in a circuit? A) Ohm’s Law B) Kirchhoff’s Voltage Law C) Kirchhoff’s Current Law D) Faraday’s Law Answer: C
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A) Flows in only one direction B) Has a constant magnitude C) Reverses direction periodically D) Cannot be transformed Answer: C Explanation: AC reverses direction periodically, unlike DC. Question 6. What is the main function of a resistor? A) Store charge B) Limit current flow C) Amplify signals D) Convert AC to DC
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Answer: B Explanation: Resistors limit or control the current flow in a circuit. Question 7. Which component stores electrical energy in an electric field? A) Resistor B) Capacitor C) Inductor D) Diode Answer: B Explanation: Capacitors store energy in an electric field.
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D) Create oscillations Answer: B Explanation: Diodes allow current to flow in only one direction. Question 10. Which device is used to rectify AC to DC? A) Capacitor B) Transformer C) Rectifier D) Inductor Answer: C Explanation: Rectifiers convert AC to DC.
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Question 11. What does a transistor commonly do in a circuit? A) Store energy B) Limit current C) Act as a switch or amplifier D) Generate AC Answer: C Explanation: Transistors are used for switching and amplification. Question 12. What color code represents a 1000 ohm resistor? A) Brown-Black-Red B) Red-Red-Brown C) Black-Red-Orange
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Question 14. What is the role of an integrated circuit (IC)? A) To perform a single function B) Combine multiple electronic functions in one package C) Store only large amounts of energy D) Convert AC to DC Answer: B Explanation: ICs integrate many components to perform complex functions. Question 15. Which is true about direct current (DC)? A) Alternates direction periodically B) Flows only in one direction
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C) Used only for transformers D) Has a frequency of 60 Hz Answer: B Explanation: DC flows in one direction only. Question 16. What happens to current in a parallel circuit? A) It is the same in every branch B) It splits among the branches C) It is zero in all branches D) It is maximum in the branch with least resistance Answer: B Explanation: In parallel circuits, current splits among the branches.
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B) Ampere C) Watt D) Ohm Answer: A Explanation: The SI unit of charge is the coulomb. Question 19. What is the function of a fuse in an electrical circuit? A) Amplify signals B) Protect circuit by breaking connection on overload C) Store charge D) Generate AC Answer: B
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Explanation: Fuses protect circuits by melting and breaking the circuit during overloads. Question 20. What happens if you connect a capacitor to a DC supply for a long time? A) It charges up and then stops conducting B) It keeps conducting C) It discharges immediately D) It acts as a short circuit Answer: A Explanation: The capacitor charges to the supply voltage and then blocks DC current.
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C) Flip-flops D) Flame-resistant clothing Answer: C Explanation: Flip-flops do not provide electrical protection. Question 23. What should be done before starting electrical maintenance on a live panel? A) Just wear gloves B) Apply lockout/tagout (LOTO) procedures C) Ignore safety procedures D) Use a wooden stick Answer: B
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Explanation: LOTO ensures equipment is safely de-energized before work. Question 24. What is the main purpose of grounding in electrical systems? A) Increase voltage B) Prevent electric shock C) Amplify current D) Store energy Answer: B Explanation: Grounding provides a safe path for fault currents, preventing shock.
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D) Wattmeter Answer: C Explanation: Ohmmeters are designed to measure resistance. Question 27. What does “bonding” refer to in electrical systems? A) Joining two wires by friction B) Connecting metal parts to ensure continuity C) Connecting to a power source D) Using glue in connections Answer: B Explanation: Bonding ensures all metal parts are electrically continuous.
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Question 28. Which code sets the standard for safe electrical installation in the USA? A) IEC B) IEEE C) NEC D) ASTM Answer: C Explanation: The NEC (National Electrical Code) is standard in the USA. Question 29. What does “arc flash boundary” mean? A) The closest distance you can stand to a live panel B) The distance at which PPE is required due to arc flash risk
