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Test: Distribution System - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test - Test: Distribution System

Test: Distribution System for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Distribution System questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Distribution System MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Distribution System below.
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Test: Distribution System - Question 1

A DC 2-wire system with mid-point earthed having cross-sectional area of each conductor be ‘a’ and resistance ‘R1’. If the DC tow wire replaces the system, then the ratio of volume of each conductor V1/V2 will be ___________

Detailed Solution for Test: Distribution System - Question 1

Let the power losses remain constant over the systems, then
2P2R/V2 = 2P2R1/2*V2
or, R = R1/4;
As R = lρ/a;
a1 = a/4;
So, V1/V1 = 1/4.

Test: Distribution System - Question 2

A DC 2-wire system with mid-point earthed having cross-sectional area of each conductor be ‘a’ and resistance ‘R1’. If this is replaced by monopolar system, then saving of copper will be ______

Detailed Solution for Test: Distribution System - Question 2

Let the power losses remain constant over the systems, then
2P2R/V2 = 2P2R1/V2
or, R1 = R
As R = lρ/a;
a1 = a
So, V1/V1 = a* 2l/a1 = 1/2.

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Test: Distribution System - Question 3

______ voltages can be available from a 3 wire DC distribution system.

Detailed Solution for Test: Distribution System - Question 3

Availability of two voltages in a 3-wire system is preferred over the 2-wire system for d.c. distribution. The principal advantage of this system is that it makes available two voltages at the consumer terminals.
V volts between any outer and neutral and 2V volts between the outers.

Test: Distribution System - Question 4

 A transmission and distribution engineer needed to design the sub transmission substation. The tapping component needed will be ______.

Detailed Solution for Test: Distribution System - Question 4

For the sub transmission level, there is no tapping at various level does not take place. For this a feeder is used.

Test: Distribution System - Question 5

A _________ distribution system is more reliable than the ______ distribution system.

Detailed Solution for Test: Distribution System - Question 5

A parallel distribution system has two end feeding and an alternative of parallel line, so in case there is a fault, the isolator can isolate the faulty part and let the healthy system operate.

Test: Distribution System - Question 6

While designing the distribution sub stations by the designer, it is required to use the _______ for the discrete power tapping.

Detailed Solution for Test: Distribution System - Question 6

For the discrete tapping of the power the consumer level it is the distributor which is employed at the sub stations and consumer levels.

Test: Distribution System - Question 7

For the single phase 2-wire system, the maximum voltage between the outer wires and earth is ________

Detailed Solution for Test: Distribution System - Question 7

The midpoint voltage will be V/√2.

Test: Distribution System - Question 8

For the figure shown, having a 2-wire dc system where mid point is earthed, having resistance of 20 ohms, with a power transmitted of 5 MW at the voltage level of 440 kV.
The power loss of the distribution system will be __________

Detailed Solution for Test: Distribution System - Question 8

I = P/V = 5000000/440000 = 11.36 A
Power loss = 2I2 * R = 2 * 11.362 * 20 = 5165 W.

Test: Distribution System - Question 9

While designing the distribution to locality of one lac population with medium dense load requirement, we can employ ________.

Detailed Solution for Test: Distribution System - Question 9

A radial system is used for the medium requirement of loading and a medium dense population as it becomes easier to install and operate.

Test: Distribution System - Question 10

The ring main distribution system is preferred over radial distribution system because _______.

Detailed Solution for Test: Distribution System - Question 10

Radial Distribution System

This system is used only when the substation is located at the center of the consumers. In this system, different feeders radiate from a substation and feed the distributors at one end. Thus, the main characteristic of a radial distribution system is that the power flow is in only one direction. It is the simplest system and has the lowest initial cost but it is not highly reliable.

Major drawbacks of a radial distribution system are,

  • A fault in the feeder will result in supply failure to associated consumers as there won't be any alternative feeder to feed distributors.
  • Voltage is affected much at far away load from the substation.

Ring main system

In this system, each distribution transformer is fed with two feeders but in different paths. The feeders in this system form a loop which starts from the substation bus-bars run through the load area feeding distribution transformers and returns to the substation bus-bars.

Ring main distribution system is the most preferred due to its following advantages:

  • There are fewer voltage fluctuations at the consumer's terminal.
  • The system is very reliable as each distribution transformer is fed with two feeders. That means, in the event of a fault in any section of the feeder, the continuity of the supply is ensured from the alternative path.
  • Voltage is affected less at far away load from the substation.

Interconnected distribution system

When a ring main feeder is energized by two or more substations, it is called as an interconnected distribution system. This system ensures reliability in an event of transmission failure. Also, any area fed from one generating station during peak load hours can be fed from the other generating station or substation for meeting power requirements from the increased load.

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