Multiple Choice Objective Question On Power System Part 1

Hello Engineers.

Q.1 Feeder is designed mainly from the point of view of-

A. Its current carrying capacity

B. Voltage drop in it

C. Operating voltage

D. Operating Frequency

Ans: A

Q.2 Distributors are designed from the point of view of –

A. Its current carrying capacity

B. Operating voltage

C. Voltage drop in it

D. Operating frequency

Ans: C

Q.3 Transmission and distribution of electric power by underground system is superior to overhead system in respect of-

A. Apperance and public safety

B. Maintenance cost

C. Frequency of faults, power failure and accidents

D. All of the above

Ans: D

Q.4 The main drawback(s) of underground system over overhead system is/are-

A. Exposure to lighting

B. Heavy initial cost

C. Exposure to atmospheric hazards such as smoke, ice, wind etc.

D. Inductive interference between power and commuication circuit

Ans: B

Q.5 The main drawback of ovehead system over underground syste is-

A. Underground system is more flexible than overhead system

B. Higher charging current

C. Surge problem

D. High initial cost

Ans: C

Q.6 By increasing the transmission voltage to double of its original value the same power can be dispatched keeping the line loss-

A. Equal to original value

B. Half the original value

C. Double the original value

D. One fourth of original value

Ans: D

Q.7 For the same voltage drop, increasing the voltage of a distributor n time-

A. Reduces the x section of the conductor by n times

B. Increases the x section of the conductor by n times

C. Reduces the x section of conductor by n^2 times

D. Increases the x section of the conductor by n^2 times

Ans: A

Q.8 The volume of copper required for an ac transmission line is inversely proportional to-

A. Current

B. Voltage

C. Power factor

D. Both b and c

Ans: D

Q.9 Improving power factor-

A. Reduces current for a given output

B. Increases losses in line

C. Increases the cost of station equipment

D. None

Ans: A

Q.10 For the same conductor length, same amount of power, same lnsse sand same maximum voltage to earth, which system requires minimum conductor area-

A. Single phase ac

B. 3 phase ac

C. 2 wire ac

D. 3 wire ac

Ans: D

Q. 11 Transmission line connects-

A. Generating station to a switching station

B. Stepdown transformer station to service transformer banks

C. Distribution transformer to consumer premises

D. Service points to consumer permises

Answer: A

Q.12 A 3 phase 4 wire system is commonly used for-

A. Primary distribution

B. Secondary distribution

C. Primary transmission

D. Secondary transmission

Ans: B

Q.13 The rated voltage of a 3 phase power system is given as-

A. rms phase voltage

B. peak phase voltage

C. peak line to line voltage

D. rms line to line voltage

Ans: D

Q.14 Which of the following is usually not the generating voltage-

A. 6.6 kV

B. 9.9 kV

C. 11kV

D. 13.2kV

Ans:B

Q.15 In a transmission system the feeder supplies power to-

A. Transformer substations

B. Service mains

C. Distributors

D. All

Ans: C

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Thanks.