POWER SYSTEM PROTECTION QUIZ

JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

POWER SYSTEM PROTECTION QUIZ_02

INTRODUCTION

Q.17 When the contacts of a circuit breaker are opened under abnormal condition,_____

1 point

sparking between the contacts

arc is struck between the contacts

contacts remains in closed position

isolators on both the sides of circuit breaker is opened

Clear selection

Q.18 A current flowing during arcing period is depend upon the ____.

1 point

electrode resistance

path resistance

arc resistance

conductor or line resistance

Clear selection

Q.19 On which of the following the arc resistance is depends?

1 point

length of arc

degree of ionization

cross section of arc

all of the above

Clear selection

Q.20 If the arc resistance is increases then the current flowing between the contacts is ___

1 point

decreases

increases

remains same

increases as exponentially

Clear selection

Q.21 Which of the following factors responsible for the maintenance of arc between contacts of circuit breaker?

1 point

distance between the contacts separation

ionized particles between contacts

potential difference between the contacts

all of the above

Clear selection

Q.22 In circuit breaker the following methods is employed for arc extinguishing.

1 point

low resistance method

high resistance method

current zero method

all of the above

Clear selection

Q.23 The transient voltage that appears across the contact at or near zero current is known as__

1 point

arc voltage

normal frequency voltage

restriking voltage

system voltage

Clear selection

Q.24 The resistance of the arc is increases by ___

1 point

cooling the arc

lengthening the arc

splitting the arc

reducing cross sectional area of the arc

all of the above

Clear selection

Q.25 Which of the following method is employed only for A.C circuit only?

1 point

low resistance method

high resistance method

current zero method

Both A or C

Clear selection

Q.26 The resistance of the arc is ____.

1 point

inversely proportional to the length

directly proportional to the length

directly proportional to the square of the length

inversely proportional to the square of length

Clear selection

Q.27 In cooling method of increasing of arc resistance, ___

1 point

cooling help in deionization of the arc path

increases the arc resistance

help in arc extinguishing

all of the above

Clear selection

Q.28 The de-ionization of the medium between the arc path is can be achieved by:

1 point

blast effect

lengthening of the arc path

high resistance and cooling

all of the above

Clear selection

Q.29 The voltage that appears across the contact of the circuit breaker during the arc is called___

1 point

arc voltage

normal frequency voltage

restriking voltage

none of the above

Clear selection

Q.30 Arc voltage

1 point

its value is low near zero current point

its value is high near zero current point

its value is low near peak current point

its value is low near normal current point

Clear selection

Submit

Clear form

Forms

This content is neither created nor endorsed by Google.