EWRB THEORY FINAL REVIEW PAPER
WITH ACCURATE ANSWERS
⫸ 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
WITH ACCURATE ANSWERS
⫸ 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
