Transmission And Distribution Part 6

Transmission And Distribution Part 6

Q1. Which of the following materials is used for overhead transmission lines ?

A.  Steel cored aluminum
B.  Galvanized steel
C.  Cadmium copper
D.  Any of the above

Ans. D

Q2. Skin effect is proportional to

A.  (conductor diameter)4
B.  (conductor diameter)3
C.  (conductor diameter)2
D.  (conductor diameter)1/2

Ans. C

Transmission And Distribution Part 6

Q3. For which of the following equipment current rating is not necessary ?

A.  Circuit breakers
B.  Isolators
C.  Load break switch
D.  Circuit breakers and load break switches

Ans. B

Q4. For aluminum, as compared to copper, all the following factors have higher values except

A.  specific volume
B.  electrical conductivity
C.  co-efficient of linear expansion
D.  resistance per unit length for same cross-section

Ans. B

Q5. The frequency of voltage generated, in case of generators, can be increased by

A.  using reactors
B.  increasing the load
C.  adjusting the governor
D.  reducing the terminal voltage

Ans. C

Q6. In transmission and distribution system the permissible voltage variation is

A.  ± 1 percent
B.  ± 10 percent
C.  ± 20 percent
D.  ± 30 percent

Ans. C

Transmission And Distribution Part 6

Q7. Which of the following has least effect on corona ?

A.  Atmospheric temperature
B.  Number of ions
C.  Size and charge per ion
D.  Mean free path

Ans. A

Q8. On which of the following does the size of a feeder depend ?

A.  Voltage drop
B.  Voltage
C.  Frequency
D.  Current carrying capacity

Ans. D

Q9. The limit of distance of transmission line may be increased by the use of

A.  series resistances
B.  shunt capacitors and series reactors
C.  series capacitors and shunt reactors
D.  synchronous condensers

Ans. C

Q10. Induction regulators are used for voltage control in

A.  alternators
B.  primary distribution
C.  secondary distribution
D.  none of the above

Ans. C