Power System Planning and Design (2180903) MCQs

MCQs of Design of distribution systems

Showing 11 to 20 out of 22 Questions
11.
For a 2-wire ac single phase distribution system operating at ‘30’ MW and ‘315’ kV, operating at the power factor of 0.8 having 15Ω of resistance of each wire, then the copper loss at the substation in kW is
(a) 105.33
(b) 108.27
(c) 210.67
(d) 240.87
Answer:

Option (c)

12.
For a 2-wire ac single phase distribution system operating at ‘30’ MW and ‘315’ kV, operating at the power factor of 0.8 having 15Ω of resistance of each wire, then the power received at the consumer end in MW is
(a) 29
(b) 29.76
(c) 29.79
(d) 29.89
Answer:

Option (c)

13.
For an AC three-phase four wire system, having a voltage of 415V, with load of 120 kW and resistance of 0.05Ω at power factor of 0.75. The incurred copper losses of the system is
(a) 4.955 kW
(b) 7.9 kW
(c) 47 kW
(d) 49 kW
Answer:

Option (a)

14.
Distributors fed at both ends has an advantage of
(a) Continuous supply
(b) Fault isolation
(c) Economical
(d) All of above
Answer:

Option (d)

15.
Ring main distribution system is preferred to a radial system due to
1. Voltage drop is more
2. Supply is reliable
3. Power factor is higher
(a) 1,2,3
(b) 1,2
(c) 2
(d) 3
Answer:

Option (c)

16.
Distribution feeding system of ring main system has
(a) 1 feeder
(b) 2 feeder
(c) 4 feeder
(d) Any number of feeder
Answer:

Option (a)

17.
A substation records a dip in the voltage received by 15%. To overcome this issue, the booster employed at the substation is
(a) A series wound generator coupled to dc shunt motor
(b) A series wound motor
(c) A shunt motor operating at lagging power factor
(d) A shunt motor coupled to differential motor
Answer:

Option (a)

18.
A substation records a dip in the voltage received by 15%. To overcome this issue, the booster employed at the substation which should have a
(a) Low voltage and high current generator
(b) High voltage and low current generator
(c) Medium voltage and high current generator
(d) Any of above
Answer:

Option (a)

19.
The cost of material used in a distribution circuit per kVA of the distributed power varies as
(a) Linear dimensions of supply area
(b) (Linear dimensions of supply area)2
(c) (Linear dimensions of supply area)3
(d) None of above
Answer:

Option (b)

20.
Permissible limit of voltage variations allowed in the distribution systems is
(a) ± 2 %
(b) ± 5 %
(c) ± 6 %
(d) ± 10 %
Answer:

Option (c)

Showing 11 to 20 out of 22 Questions