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WorksheetsRelay
Total questions: 10
Worksheet time: 5mins
Protective relays can be designed to respond to ___________
Light intensity, impedance
Temperature, resistance, reactance
Voltage and current
All of these
A relay is used to
Break the fault current
Sense the fault
Sense the fault and direct to trip the circuit breaker
All of these
Basic relay connection requirement is that the relay must operate for
Load
Internal faults
Both (a) and (b)
None of these
The function of a relay is to
Detect fault
Interrupt circuit
Detect and interrupt
Both of these
Good relay should possess
speed
reliability
sensitivity
all of the above
A relay is a
mechanical switch
electronic switch
electromechanical switch
all of the above
which of the following relay operates when current exceeds a preset value?
Overcurrent relay
Differential relay
instantaneous relay
static relay
How many relays are used to detect the interphase fault of three phase system?
1
2
3
6
The burden of a protective relay is the power
Required to operate the circuit breaker
Absorbed by the circuit of relay
Developed by the relay circuit
None of the above
On what factor does the operating speed of the relay depend upon?
Rate of flux built up
Armature core air gap
Spring tension
All of these
