Transmission & Distribution Mcqs - Set 8

1)   Pin type insulators are generally not used for voltages beyond_________?

a. 1 kV
b. 11 kV
c. 22 kV
d. 33 kV
Answer  Explanation 

ANSWER: 33 kV

Explanation:
No explanation is available for this question!


2)   The current drawn by the line due to corona losses is___________?

a. non-sinusoidal
b. sinusoidal
c. triangular
d. square
Answer  Explanation 

ANSWER: non-sinusoidal

Explanation:
No explanation is available for this question!


3)   The use of strain type insulators is made where the conductors are__________?

a. dead ended
b. at intermediate anchor towers
c. any of the above
d. none of the above
Answer  Explanation 

ANSWER: any of the above

Explanation:
No explanation is available for this question!


4)   The voltage drop, for constant voltage transmission is compensated by installing__________?

a. inductors
b. capacitors
c. synchronous motors
d. all of above
e. none of the above
Answer  Explanation 

ANSWER: synchronous motors

Explanation:
No explanation is available for this question!


5)   jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

a. 6.6 kV (r.m.s. value)/cm
b. 11 kV (r.m.s. value)/cm
c. 22 kV (maximum value)/cm
d. 30 kV (maximum value)/cm
Answer  Explanation 

ANSWER: 30 kV (maximum value)/cm

Explanation:
No explanation is available for this question!


6)   In a substation the following equipment is not installed?

a. exciters
b. series capacitors
c. shunt reactors
d. voltatre transformers
Answer  Explanation 

ANSWER: exciters

Explanation:
No explanation is available for this question!


7)   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
Answer  Explanation 

ANSWER: Isolators

Explanation:
No explanation is available for this question!


8)   A circuit is disconnected by isolators when____________?

a. line is energized
b. there is no current in the line
c. line is on full load
d. circuit breaker is not open
Answer  Explanation 

ANSWER: there is no current in the line

Explanation:
No explanation is available for this question!


9)   By which of the following a bus-bar is rated?

a. Current only
b. Current and voltage
c. Current, voltage and frequency
d. Current, voltage, frequency and short time current
Answer  Explanation 

ANSWER: Current, voltage, frequency and short time current

Explanation:
No explanation is available for this question!


10)   In aluminium conductors, steel core is provided to____________?

a. compensate for skin effect
b. neutralise proximity effect
c. reduce line inductance
d. increase the tensile strength
Answer  Explanation 

ANSWER: increase the tensile strength

Explanation:
No explanation is available for this question!