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EWRB Theory Exam Prep Questions With Guaranteed Pass Solutions.
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  • Electrical Theory
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  • Electrical Theory

What is the minimum value of the permitted test result for the insulation resistance test of a three-phase, 400V, mains cable? - Answer 1MΩ When carrying out testing on a low voltage electrical installation, which document details the tests and checks required to be carried out? - Answer ...

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  • October 17, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • Electrical Theory
  • Electrical Theory

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EWRB Theory Exam Prep Questions
With Guaranteed Pass Solutions.
What is the minimum value of the permitted test result for the insulation resistance test of a three-
phase, 400V, mains cable? - Answer 1MΩ



When carrying out testing on a low voltage electrical installation, which document details the tests and
checks required to be carried out? - Answer AS/NZS 3000



What is the minimum or maximum test result value you would consider acceptable for an Earth
Continuity test? - Answer 1Ω or less



State TWO types of electrical protection provided by a RCBO. - Answer ANY TWO:

- Earth Leakage

- Overload

- Short Circuit



If the voltage and current are known, what TWO other factors are required to calculate the power
consumed by a three-phase motor? - Answer √3 & Power Factor



What type of single-phase motor can be reversed by reversing the connections to the run winding? -
Answer ANY ONE:

- Split-Phase Motor

- Capacitor Start Motor

- Cap-Start, Cap-Run Motor



What type of single-phase motor can be reversed by reversing the connections to the armature brushes?
- Answer ANY ONE:

- Universal Motor

- Series Motor

, State ONE reason why the metal frame of a Class 1 electrical appliance is earthed. - Answer ANY ONE:

- To ensure the operation of a protective device under fault conditions.

- To keep the frame of the appliance at earth potential under fault conditions.



State TWO factors that determine the severity of electric shock upon the human body. - Answer ANY
TWO:

- Voltage Applied

- Shock Current Level

- Contact Duration

- Skin Dryness

- Current Path



You have carried out a test on a low voltage final subcircuit in an electrical installation, the result value
was 20MΩ. What type of test has been carried out? - Answer Insulation Resistance Test



State the main reason why interlocks are used in a star/delta starter. - Answer To prevent the star and
delta contractors closing simultaneously - and causing a short circuit.



Calculate the power factor of a small three-phase printing factory with mainly motor loading. Metering
instruments have recorded the following:

Power = 30000W

Voltage = 406V

Current = 57A per phase - Answer 0.748

pf = P/V×I×√3



Define the term CUT OFF TIME as it refers to HRC fuses. - Answer ANY ONE:

- Pre-arcing Time: Time taken to melt the fuse elements.

- Arcing Time: The time taken between the initiation of the arc, and the arc extinguishing.

- Cut Off Current: The fault current that will cause the fuse to blow.

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