Switchgear protections Archives - Page 4 of 10 - MCQ and Quiz for Exams

31. The fuse blows off by

burning

arcing

melting

none of the above

Detailed SolutionThe fuse blows off by

32. H.R.C. fuses provide best protection against

overload

reverse current

fuses provide best protection against A. overload B. reverse current C. open-circuits

short-circuits

Detailed SolutionH.R.C. fuses provide best protection against

33. Overfluxing protection is recommended for

distribution transformer

generator transformer of the power plant

auto-transformer of the power plant

station transformer of the power plant

Detailed SolutionOverfluxing protection is recommended for

34. The main function of a fuse is to

protect the line

open the circuit

protect the appliance

prevent excessive currents E. none of the above

Detailed SolutionThe main function of a fuse is to

35. A short-circuit is identified by

no current flow

heavy current flow

voltage drop

voltage rise

Detailed SolutionA short-circuit is identified by

36. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

Zero

Unity

Infinity

None of the above

Detailed SolutionWhat will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

37. Ionization in circuit breaker is facilitated by

high temperature

increase of mean free path

increasing field strength

all of the above

Detailed SolutionIonization in circuit breaker is facilitated by

38. The fuse rating is expressed in terms of

current

voltage

VAR

kVA

Detailed SolutionThe fuse rating is expressed in terms of

39. When a transmission line is energized, the wave that propagates on it is

current wave only

voltage wave only

both (A) and (B)

power factor wave only

Detailed SolutionWhen a transmission line is energized, the wave that propagates on it is

40. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?

Radiation

Convection

fuse is dissipated ? A. Radiation B. Convection C. Conduction

All of the above

Detailed SolutionBy which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?

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