Transmission And Distribution Of Electrical Energy Set 2
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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