Switchgear and Protection Mcqs
This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Switchgear and Protection”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Switchgear and Protection Mcqs comprehensively.
2. The steady state stability of the power system can be increased by_____________?
Connecting lines in parallel
Connecting lines in series
Using machines of high impedance
Reducing the excitation of machines
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3. Series capacitors are used to_________________?
Compensate for line inductive reactance
Compensate for line capacitive reactance
Improve line voltage
None of the above
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4. The torque produced in induction type relay (shaded pole structure) is_____________?
Inversely proportional to the current
Inversely proportional to the square of the current
Proportional to the current
Proportional to square of the current
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5. Admittance relay is __________ relay?
Impedance
Directional
Non-directional
None of the above
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6. Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
100 microsecond
50 millisecond
0.5 sec
0.1 sec
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7. The fuse wire, in D.C. circuits, is inserted in____________?
Negative circuit only
Positive circuit only
Both (A) and (B)
Either (A) or (B)
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8. A fuse is never inserted in____________?
Neutral wire
Negative of D.C. circuit
Positive of D.C. circuit
Phase dine
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9. A switchgear is device used for_____________?
Interrupting an electrical circuit
Switching an electrical circuit 111.
Switching and controlling an electrical circuit
Switching, controlling and protecting the electrical circuit and equipment
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10. The information to the circuit breaker under fault conditions is provided by____________?
Relay
Rewirable fuse
H.R.C. only
All of the above
11. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
Radiation
Convection
Conduction
All of the above
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12. A balanced 3-phase system consists of_______________?
Zero sequence currents only
Positive sequence currents only
Negative and zero sequence currents
Zero, negative and positive sequence currents
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13. A short-circuit is identified by_____________?
No current flow
Heavy current flow
Voltage drop
Voltage rise
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14. To limit short-circuit current in a power system are used______________?
Earth wires
Isolators
H.R.C. fuses
Reactors
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15. In a single bus-bar system there will be complete shut down when____________?
Fault occurs on the bus itself
Fault occurs on neutral line
Two or more faults occur simultaneously
Fault occurs with respect to earthing
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