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WorksheetsBET Unit 4
Total questions: 15
Worksheet time: 8mins
Switchgear is used for:
Only controlling electrical power
Only protecting equipment
Only isolating circuits
Controlling, protecting, and isolating circuits
Low Voltage (LV) switchgear operates up to:
100 V
1 kV AC
11 kV
33 kV
A Double Pole (DP) MCB controls:
Only one phase
Two live wires
One live and one neutral
Three live wires
Which MCB type is used in three-phase 4-wire systems?
SP
DP
TP
TPN
ELCB primarily protects against:
Short-circuit
Overload
Earth leakage
Over-voltage
A typical personal safety ELCB trips at:
5 mA
30 mA
1 A
5 A
MCCB is preferred over MCB when:
Low currents are used
Load current is high
Space is limited
Cost must be low
Which of the following has adjustable trip setting?
MCB
ELCB
MCCB
None
The main purpose of earthing is to:
Improve voltage regulation
Provide low-resistance path for fault current
Increase load capacity
Reduce power factor
In plate earthing, the plate is buried typically at:
1 m
1.5 m
3 m
5 m
Soil around earth electrode is filled with:
Charcoal and cement
Charcoal and salt
Sand and salt
Water only
RCCB is another name for:
Overload relay
Voltage-operated ELCB
Current-operated ELCB
MCCB
Which switchgear is used in household distribution boards?
MCCB
MCB
Isolator
OLTC
Which protection device detects insulation failure?
MCB
MCCB
ELCB
Fuse
In pipe earthing, the pipe is usually made of:
PVC
GI or copper
Rubber
Plastic
