Electrical Installation and Maintenance NC III Test

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Questions and Answers

What is the required floor covering for under-floor raceway installed beneath concrete or other flooring materials?

Linoleum

Laminated Steel

Metal Clad (correct)

Glass

What is the maximum allowable cross-sectional area of all conductors or cables in relation to the interior cross-sectional area of the cell or header?

50%

30% (correct)

25%

40%

What amount of current will be drawn by an incandescent bulb connected to a 115-volt circuit with a resistance of 264.5 ohms?

0.43 amps (correct)

0.42 amps

0.45 amps

2.3 amps

When measuring ballast resistance, what is the proper condition for the source?

De-energized Signup and view all the answers

What function does a circuit breaker perform?

Protects against current surges and overloads Signup and view all the answers

What is the recommended method for safely de-energizing a live duplex wire?

One-by-one using diagonal cutter Signup and view all the answers

What type of power supply is required for an electrical system with a system neutral?

Wye connected Transformer Signup and view all the answers

What will occur if a motor's rotor is locked and it is forced to stop while in operation?

Encounter high current Signup and view all the answers

Which type of switch is used for starting the motor?

Dual motor pushbutton switch Signup and view all the answers

What is the required rated voltage for a six leads out motor?

All of the above Signup and view all the answers

How does the circuit breaker handle electrical faults?

Through its interrupting capacity Signup and view all the answers

Before energizing the main circuit breaker, which condition is proper for all loads?

And branch circuit breaker are de-energized Signup and view all the answers

What protective device is recommended to prevent motor damage from recurring single phasing?

Phase sensing relay Signup and view all the answers

Which protective device prevents accidental reversing of motor rotation due to phase reversal?

Phase sequence relay Signup and view all the answers

The full load current of a motor is 40 Amperes. What is the minimum conductor capacity needed?

125% of the full load current Signup and view all the answers

What happens to a 3-phase motor during single phasing due to loose cable termination?

It gets burned due to overheating Signup and view all the answers

In a circuit containing an inductance as a magnetic coil, how does the current behave in relation to the voltage?

The current will lag the voltage Signup and view all the answers

What method is most effective for cleaning oil spills on concrete floors?

Spreading sand and then sweeping it Signup and view all the answers

What is the main reason for grounding the frame of a portable electric hand tool?

Reduce electric shock Signup and view all the answers

When positioning a climbing ladder for safety, what is the recommended angle from the vertical?

30 degrees Signup and view all the answers

Which of the following is NOT a competency covered under Electrical Installation and Maintenance NC III?

Design electrical engineering plans Signup and view all the answers

What could potentially happen if the equipment is not properly grounded?

Risk of electric shock or damage Signup and view all the answers

When maintaining motor control systems, what is a critical aspect to ensure functionality?

Regular inspection and testing Signup and view all the answers

In terms of safety protocols, what should be avoided during the maintenance of electrical equipment?

Working with live circuits Signup and view all the answers

Study Notes

National Assessment for Electrical Installation and Maintenance NC III - Written Test

Qualification: Electrical Installation and Maintenance NC III
Units of Competency Covered:
- Perform installation of data measurement and control system on electrical and auxiliary equipment.
- Install, assemble, test, and maintain motor control systems.
Instructions:
- Read directions carefully.
- Write answers on the answer sheet provided.
- Scratch work can be done on the back of the answer sheet.
- Complete the test within one hour (hand in sooner if finished early).
- Use capital letters only.

Example 1: Multiple Choice

Question: To ensure safety of tools and equipment, where should they be stored?
Options:
- Production office
- Locker room
- Tool room
- Electrical room
Correct Answer: Tool room (C)

Test Questions - Page 4

Question 1: How does inductance impact the relationship between current and voltage in a circuit?
- Correct Answer: The current lags the voltage (D)
Question 2: How should oil spills on concrete floors be handled?
- Correct Answer: Spreading sand and sweeping (D)
Question 3: Why is grounding the frame of a portable electric hand tool important?
- Correct Answer: To prevent electric shock (A)
Question 4: What's the correct angle for positioning a ladder for safety?
- Correct Answer: 30° from the vertical (A)
Question 5: What material typically covers under-floor raceways?
- Correct Answer: Linoleum (B)

Test Questions - Page 5

Question 6: What is the maximum allowable combined cross-sectional area for conductors or cables?
- Correct Answer: 50% of the interior cross-sectional area of the cell or header (D)
Question 7: How much current will a 115-volt, 264.5-ohm incandescent bulb draw?
- Correct Answer: 0.43 amps (B)
Question 8: When measuring ballast resistance, what's the state of the source?
- Correct Answer: De-energized (B)
Question 9: What does a circuit breaker protect electrical equipment from?
- Correct Answer: Current surges and overloads (B)
Question 10: How to safely de-energize a live duplex wire?
- Correct Answer: One-by-one using diagonal cutter (D)

Test Questions - Page 6

Question 11: What kind of power supply is used with a system neutral?
- Correct Answer: Single-phase four-wire (D)
Question 12: What happens if a motor's rotor is locked?
- Correct Answer: Encounters high current & potentially burns (B)
Question 13: A 1HP, 230V, 1-phase, 60Hz motor supplied with 110VAC will:
- Correct Answer: Rotate slowly, encounter high current, and may burn (B)
Question 14: Which switch is commonly used for starting a motor?
- Correct Answer: Single pole switch (D)
Question 15: What are the typical voltage ratings for a 6-lead motor?
- Correct Answer: All of the above (D)

Test Questions - Page 7

Question 16: How do circuit breakers handle electrical faults?
- Correct Answer: Tripping capacity (A)
Question 17: What's the proper procedure before energizing the main circuit?
- Correct Answer: All loads and branch circuit breakers are de-energized (D)
Question 18: A 3-phase motor burning due to single phasing requires what protective device?
- Correct Answer: Overload relay (A)
Question 19: What protective device prevents accidental motor reversal?
- Correct Answer: Phase sequence relay (A)
Question 20: What is the minimum required conductor capacity for a motor with a 40-Ampere full load current?
- Correct Answer: 125% of the full load current (A)

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Description

This quiz assesses your knowledge in Electrical Installation and Maintenance NC III, covering installation, testing, and maintenance of electrical systems. Answer multiple-choice questions based on the competencies outlined in the qualification. Prepare to demonstrate your understanding of inductance, motor control systems, and safe tool storage.