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EWRB Theory Exam Questions with Complete Solutions
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EWRB Theory Exam Questions with Complete Solutions
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EWRB Theory Exam Questions withComplete Solutions
Define the term ISOLATION as it relates to three phase equipment - ANSWER Means
the equipment has been deliberately disconnected from the electrical supply, and
precautions have been taken to prevent re-connection of the supply to the equipment
State to precautions to be taken when attaching a danger. Tag to an isolation switch. -
ANSWER Make sure your attaching it to the right isolator
Make sure the isolating switch is in the off position when tagged
Calculate the input power of the motor - ANSWER Output power, divided by , efficiency
Calculate the line current of the motor - ANSWER Input power divided by square root
of three times voltage times power factor
Calculate the speed of the motor - ANSWER 60 F divided by p
Calculate the rotor speed of the motor - ANSWER N - slip speed
State, the reason why on earth fault loop impedance test is also carried out at the
switchboard of the electrical installation - ANSWER To ensure the HRC fuse, breaking
capacity is rated to safely interrupt and the PSSC following under fault conditions
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