Question 1

The material commonly used for insulation in high voltage cables is

Accepted Answer

A)  lead
B)  paper
C)  rubber
D)  none of the aboveE) B) and D)
F) All of the above

Question 2

Which of the following is usually not the generating voltage ?

Accepted Answer

A)  6.6 kV
B)  8.8 kV
C)  11 kV
D)  13.2 kVE) A) and B)
F) C) and D)

Question 3

The loads on distributors systems are generally

Accepted Answer

A)  balanced
B)  unbalanced
C)  either of the above
D)  none of the aboveE) A) and D)
F) All of the above

Question 4

High voltage transmission lines use

Accepted Answer

A)  suspension insulators
B)  pin insulators
C)  both (a)  and (b) 
D)  none of the aboveE) A) and B)
F) A) and C)

Question 5

Overhead lines generally use

Accepted Answer

A)  copper conductors
B)  all aluminium conductors
C)  A.C.S.R. conductors
D)  none of theseE) None of the above
F) A) and B) C

Question 6

The conductors of the overhead lines are

Accepted Answer

A)  solid
B)  stranded
C)  both solid and stranded
D)  none of the aboveE) B) and D)
F) None of the above B

Question 7

For an overhead line, the surge impedance is taken as

Accepted Answer

A)  20-30 ohms
B)  70-80 ohms
C)  100-200 ohms
D)  500-1000 ohmsE) All of the above
F) B) and C)

Question 8

The power factor of industrial loads is generally

Accepted Answer

A)  unity
B)  lagging
C)  leading
D)  zeroE) A) and B)
F) A) and C)

Question 9

Transmission line insulators are made of

Accepted Answer

A)  glass
B)  porcelain
C)  iron
D)  P.V.C.E) A) and B)
F) None of the above

Question 10

The material generally used for armour of high voltage cables is

Accepted Answer

A)  aluminium
B)  steel
C)  brass
D)  copperE) A) and B)
F) A) and C)

Question 11

The material commonly used for sheaths of underground cables is

Accepted Answer

A)  lead
B)  rubber
C)  copper
D)  ironE) A) and B)
F) All of the above A

Question 12

The presence of ozone due to corona is harmful because it

Accepted Answer

A)  reduces power factor
B)  corrodes the material
C)  gives odour
D)  transfer energy to the groundE) A) and C)
F) B) and C)

Question 13

A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is

Accepted Answer

A)  one-fourth
B)  one-third
C)  one-half
D)  twiceE) A) and B)
F) A) and C)

Question 14

Distribution lines in India generally use

Accepted Answer

A)  wooden poles
B)  R.C.C. poles
C)  steel towers
D)  none of the aboveE) B) and C)
F) A) and C)

Question 15

The minimum clearance between the ground and a 220 kV line is about

Accepted Answer

A)  4.3 m
B)  5.5 m
C)  7.0 m
D)  10.5 mE) None of the above
F) B) and D)

Question 16

Most of the high voltage transmission lines in India are

Accepted Answer

A)  underground
B)  overhead
C)  either of the above
D)  none of the aboveE) A) and B)
F) A) and C)

Question 17

Large industrial consumers are supplied electrical energy at

Accepted Answer

A)  400 V
B)  11 kV
C)  66 kV
D)  400 kVE) A) and B)
F) A) and C)

Question 18

The distributors for residential areas are

Accepted Answer

A)  single phase
B)  three-phase three wire
C)  three-phase four wire
D)  none of the aboveE) None of the above
F) A) and B)

Question 19

In transmission lines the cross-arms are made of

Accepted Answer

A)  copper
B)  wood
C)  R.C.C.
D)  steelE) A) and B)
F) A) and C)

Question 20

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is

Accepted Answer

A)  25 percent
B)  50 percent
C)  75 percent
D)  100 percentE) B) and C)
F) C) and D)

Exam 2: Electrical Supply and Distribution

The material commonly used for insulation in high voltage cables is

Correct AnswerverifiedShow Answer

Which of the following is usually not the generating voltage ?

Correct AnswerverifiedShow Answer

The loads on distributors systems are generally

Correct AnswerverifiedShow Answer

High voltage transmission lines use

Correct AnswerverifiedShow Answer

Overhead lines generally use

Correct AnswerverifiedC

The conductors of the overhead lines are

Correct AnswerverifiedB

For an overhead line, the surge impedance is taken as

Correct AnswerverifiedShow Answer

The power factor of industrial loads is generally

Correct AnswerverifiedShow Answer

Transmission line insulators are made of

Correct AnswerverifiedShow Answer

The material generally used for armour of high voltage cables is

Correct AnswerverifiedShow Answer

The material commonly used for sheaths of underground cables is

Correct AnswerverifiedA

The presence of ozone due to corona is harmful because it

Correct AnswerverifiedShow Answer

A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is

Correct AnswerverifiedShow Answer

Distribution lines in India generally use

Correct AnswerverifiedShow Answer

The minimum clearance between the ground and a 220 kV line is about

Correct AnswerverifiedShow Answer

Most of the high voltage transmission lines in India are

Correct AnswerverifiedShow Answer

Large industrial consumers are supplied electrical energy at

Correct AnswerverifiedShow Answer

The distributors for residential areas are

Correct AnswerverifiedShow Answer

In transmission lines the cross-arms are made of

Correct AnswerverifiedShow Answer

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is

Correct AnswerverifiedShow Answer

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C

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B

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A

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