Transmission And Distribution(Electrical Engineering ) Questions and Answers

Question 1. By which of the following a bus-bar is rated?
  1.    Current only
  2.    Current and voltage
  3.    Current, voltage and frequency
  4.    Current, voltage, frequency and short time current
Explanation:-
Answer: Option D. -> Current, voltage, frequency and short time current
Question 2. Overhead system can be designed for operation up to
  1.    11 kV
  2.    33 kV
  3.    66 kV
  4.    400 kV
Explanation:-
Answer: Option D. -> 400 kV
Question 3. In aluminium conductors, steel core is provided to
  1.    Compensate for skin effect
  2.    Neutralise proximity effect
  3.    Reduce line inductance
  4.    Increase the tensile strength
Explanation:-
Answer: Option D. -> Increase the tensile strength
Question 4. Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?
  1.    Static condenser
  2.    Synchronous condenser
  3.    Tap changing transformer
  4.    Booster transformer
Explanation:-
Answer: Option D. -> Booster transformer
Question 5. The frequency of voltage generated, in case of generators, can be increased by
  1.    Using reactors
  2.    Increasing the load
  3.    Adjusting the governor
  4.    Reducing the terminal voltage
Explanation:-
Answer: Option C. -> Adjusting the governor
Question 6. For transmission of power over a distance of 200 km, the transmission voltage should be
  1.    132 kV
  2.    66 kV
  3.    33 kV
  4.    11 kV
Explanation:-
Answer: Option A. -> 132 kV
Question 7. In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to
  1.    boost the generated voltage
  2.    balance loads on both sides of the neutral
  3.    make both machine^ run as unloaded motors
  4.    equalize voltages on the positive and negative outers
Explanation:-
Answer: Option D. -> equalize voltages on the positive and negative outers
Question 8. Which of the following materials is not used for transmission and distribution of electrical power?
  1.    Copper
  2.    Aluminium
  3.    Steel
  4.    Tungsten
Explanation:-
Answer: Option D. -> Tungsten
Question 9. The steel used in steel cored conductors is usually
  1.    Alloy steel
  2.    Stainless steel
  3.    Mild steel
  4.    High speed steel
Explanation:-
Answer: Option C. -> Mild steel
Question 10. The angular displacement between two interconnected stations is mainly due to
  1.    Armature reactance of both alternators
  2.    Reactance of the interconnector
  3.    Synchronous reactance of both the alternators
  4.    All of the above
Explanation:-
Answer: Option A. -> Armature reactance of both alternators
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