Electrical Theory And Practical Test Questions and Answers Guaranteed To Pass!!
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Course
EWRB
Institution
EWRB
Electrical Theory And Practical Test Questions and Answers Guaranteed To Pass!!
State the permissible test result for an insulation resistance test for the electrical installation with ALL the permanently-connected electrical equipment DISCONNECTED - ANSWER 1 Mega Ohm
State the permissi...
, State the permissible test result for an insulation resistance test for the electrical
installation with ALL the permanently-connected electrical equipment DISCONNECTED
- ANSWER 1 Mega Ohm
State the permissible test result for an insulation resistance test for the electrical
installation with ALL the permanently-connected electrical equipment CONNECTED -
ANSWER 0.01 Mega Ohms
A
A three-phase induction motor normally runs on full-load. State ONE reason why this
VI
motor should not be run LIGHTLY LOADED when it runs on full load. - ANSWER -
The power factor of the motor will be poor
- The motor will be less efficient
TU
- running costs rise
A three-phase induction motor has been OPERATING NORMALLY ON FULL-LOAD.
The motor starts to over-heat even though it is drawing the normal full load current.
IS
State ONE reason why this situation would occur - ANSWER - The motor ventilation
is restricted in some manner
- The cooling fan has become detached from the motor shaft
M
A clip-on ammeter is being used to test the integrity of the insulation of a repaired Class
O
I electrical appliance, while the appliance is live. Where on the appliance would the
clip-on ammeter be used? Also state the maximum test result that would allow the
appliance to return to service. - ANSWER Clamped around the protective earthing
A
conductor and 5mA
N
Explain what is meant by the term INVERSE TIME-CURRENT CHARACTERISTIC in
relation to protective devices - ANSWER as current through the protective device
increases, the time taken to operate decreases
JP
State TWO components that are typically used to smooth the d.c output of a rectifier -
ANSWER - Capacitors
- Inductors
- Resistors
The output circuit of an autotransformer MUST BE insulated for the highest input or
output voltage of the autotransformer. State ONE reason for this requirement -
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