Transmission And Distribution Of Electrical Energy Set 2 MCQs

This set of Transmission and Distribution of Electrical Energy Multiple Choice Questions & Answers (MCQs) focuses on Transmission And Distribution Of Electrical Energy Set 2

Q1 | The cause of damage to the lead sheath of a cable is

crystallisation of the lead through vibration

chemical action on the lead when buried in the earth

mechanical damage

all of the above

Q2 | The voltage of the single phase supply to residential consumers is

110 V

210 V

230 V

400 V

Q3 | Most of the high voltage transmission lines in India are

underground

overhead

either of the above

none of the above

Q4 | The distributors for residential areas are

single phase

three-phase three wire

three-phase four wire

none of the above

Q5 | The conductors of the overhead lines are

solid

stranded

both solid and stranded

none of the above

Q6 | High voltage transmission lines use

suspension insulators

pin insulators

both (a) and (b)

none of the above

Q7 | Multicore cables generally use

square conductors

circular conductors

rectangular conductors

sector-shaped conductors

Q8 | Distribution lines in India generally use

wooden poles

R.C.C. poles

steel towers

none of the above

Q9 | The material commonly used for insulation in high voltage cables is

lead

paper

rubber

none of the above

Q10 | The loads on distributors systems are generally

balanced

unbalanced

either of the above

none of the above

Q11 | The power factor of industrial loads is generally

unity

lagging

leading

zero

Q12 | Overhead lines generally use

copper conductors

all aluminium conductors

A.C.S.R. conductors

none of these

Q13 | In transmission lines the cross-arms are made of

copper

wood

R.C.C.

steel

Q14 | The material generally used for armour of high voltage cables is

aluminium

steel

brass

copper

Q15 | Transmission line insulators are made of

glass

porcelain

iron

P.V.C.

Q16 | The material commonly used for sheaths of underground cables is

lead

rubber

copper

iron

Q17 | The minimum clearance between the ground and a 220 kV line is about

4.3 m

5.5 m

7.0 m

10.5 m

Q18 | The spacing between phase conductors of a 220 kV line is approximately equal to

2 m

3.5 m

6 m

8.5 m

Q19 | Large industrial consumers are supplied electrical energy at

400 V

11 kV

66 kV

400 kV

Q20 | In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to

boost the generated voltage

balance loads on both sides of the neutral

make both machine^ run as unloaded motors

equalize voltages on the positive and negative outers

Q21 | In a D.C. 3-wire distributor using balancers and having unequal loads on the two sides

both balancers run as generators

both balancers run as motors

balancer connected to lightly- loaded side runs as a motor

balancer connected to heavily- loaded side runs as a motor

Q22 | Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased100 percent, saving in copper is

25 percent

50 percent

75 percent

100 percent

Q23 | 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

one-fourth

one-third

one-half

twice

Q24 | As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage toearth uses only

31.25 percent of copper

33.3 percent of copper

66.7 percent of copper

125 percent of copper

Q25 | Which of the following is usually not the generating voltage ?

6.6 kV

8.8 kV

11 kV

13.2 kV