A. None of the above

C. Time-delay trip

D. All of the above

E. Inverse time trip

A. two single phase motors running in parallel

C. single phase motors only

D. two phase motors only

A. Infinity

B. None of the above

D. Unity

A. Resistance

C. Inductance

D. Reactance

A. thermometer

B. thermocouple

D. pyrometer

B. Electrostatic effect

C. Photoelectric effect

D. Magnetic effect

A. be of sufficient size and proper shape

B. be clean and smooth

D. have low contact resistance

A. current wave only

B. voltage wave only

D. power factor wave only

B. protect the line

C. prevent excessive currents

D. protect the appliance

E. open the circuit

A. high speed and selectivity

B. good selectivity and reliability

D. economy and simplicity

A. improve line voltage

B. none of the above

D. compensate for line capacitive reactance

A. aluminium alloy

C. porcelain

D. electrolytic copper

A. heavy loads

C. all of the above

D. external short-circuits

A. light intensity

C. resistance, reactance or impedance

D. voltage and current

E. temperature

A. burning

B. none of the above

C. arcing

A. interception, conduction, dissipation and reflection

C. none of the above

D. interception

E. interception and conduction

B. long transmission line

C. medium transmission line

D. medium and long transmission lines

A. impedance

C. none of the above

D. non-directional

A. extinguish the arc

B. emit the ionizing electrons

D. maintain the arc

A. 100 microsecond

C. 0.5 sec

D. 0.1 sec

B. fault occurs on neutral line

C. fault occurs with respect to earthing

D. two or more faults occur simultaneously

A. Isolator

B. Air break circuit breaker

C. None of the above

E. Oil circuit breaker

B. few turns of thick wire

C. many turns of thick wire

D. few turns of thin wire

A. Oil

B. SF6

D. Water

A. increase of mean free path

C. increasing field strength

D. high temperature

A. motor

B. generator

D. feeder

A. 6

B. 2

C. 4

A. higher than that of if fault occurs away from the relay

B. constant for all distances

C. none of the above

A. inrush protection

B. distance protection

C. time graded and current graded over current protection

E. none of the above

B. minimum voltage

C. maximum voltage

D. maximum current

A. motors

B. transformers

C. busbars

E. generators

A. Transmission line

B. Transformers

D. Motors

A. earth wires

C. isolators

D. H.R.C. fuses

A. lengthening of the gap

B. cooling and blast effect

D. deionizing the oil with forced air

E. none of the above

A. thermocouple

B. electronic and bimetallic

D. none of the above

A. 33kVto66kV

C. HkVto33kV

D. none of the above

A. temperature

C. short-circuit

D. over voltage

A. Radiation

B. All of the above

D. Convection

A. none of the above

B. required to operate the circuit breaker

D. developed by the relay circuit

A. any of the above

B. transformers to isolate the two systems

C. arc extinguishers

D. circuits to break the system

A. circuit breakers

B. fuses

C. relays

A. tapping

B. sending end

C. load end

E. all of the above

A. electromagnetic

C. solid state

D. induction

E. thermal

A. lengthening of the gap

B. cooling and blast effect

D. deionizing the oil with forced air

E. none of the above

A. none of the above

B. is lighter than air

C. is yellow in colour

E. has pungent small

A. high speed of operation

C. no ageing effect

D. high rupturing capacity

A. voltage wave

B. all of the above

C. current

A. switching an electrical circuit 111.

B. interrupting an electrical circuit

C. switching and controlling an electrical circuit

B. armature core air gap

C. the spring tension

D. the rate of flux built up

A. none of the above

B. voltage during abnormal condition

D. current during abnormal condition