Power Systems - MCQTrip

MCQTrip provides a comprehensive collection of multiple-choice questions (MCQs) on power systems, covering topics such as power system components, power system analysis, and power system protection. It is a great resource for students and professionals looking to test their knowledge and understanding of power systems.

Challenge yourself to get the highest score. Twenty (20) MCQ questions from our test bank will be randomly shown for every attempt. Passing mark for this test is 70%.

Welcome to Power Systems.

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The conductor of a 10 km long, single phase, two wire line are separated by a distance of 1.5 m. The diameter of each conductor is 1 cm, If the conductors are of copper, the inductance of the circuit is

45.3 mH

23.8 mH

50.0 mH

19.6 mH

None

What is the maximum value of a load which consume 500 KWh per day at a load factor of 0.40, if the consumer increases the load factor of 0.50 without increasing the maximum demand?

4.5 kW

52.08 kW

60 kW

50.8 kW

None

On what basis is the insulation level of a 400 kv, EHV overhead transmission line decided?

Lightning over voltage

Radio and TV interference

Switching over voltage

Corona inception voltage

None

Conductors used in HT transmission lines are stranded because of

Increased tensile strength

Cheaper in cost

Ease in handling

Reduced resistivity

None

The rated voltage of a 3-ph power system is given as

peak line to line voltage

rms phase voltage

rms line to line voltage

peak phase voltage

None

Hollow conductors are used in transmission lines to

Improve stability

Reduce corona

Reduce weight of copper

None

A consumer consume. 600 kWh per day at a load factor of 0.40. If the coneumer increases the load factor of 0.70 without increasing the maximum demand, what is the consumption of energy in kWh

1100 kWh

1050 kWh

950 kWh

1000 kWh

None

Steel poles for transmission lines need protection against

Corrosion

Borer

Termites

None

A 100 km long transmission line is loaded at 110 kV.if the loss of line is 5 MW and the load is 150 MVA, the resistance of the line is

8.06 ohms per phase

80.6 ohms per phase

0.0806 ohms per phase

0.806 ohms per phase

None

Transposition of transmission line is done to

Balance line voltage drop

Reduce line loss

Reduce skin effect

None

For certain geometry and operating voltage of the uncompensated transmission line, the ratio of power transfer capability to the surge inpedance loading with increase in length

decreases

increases

uncertain

remains unchanged

None

A 60 Hz, 320 km lossless line has sending end voltage 1.0 p.u, The receiving end voltage on no load is

1.116 p.u

1.1 p.u

1.088 p.u

None

Which of the following properties has got higher value for aluminum in comparison to that of copper

Thermal conductivity

Electrical resistivity

Melting point

Specific gravity

None

The pu impedance of a line to 50 MVA, 132 kv base is 0.4, the pu impedance to a 100 MVA, 132 kv base will be

0.4

0.2

0.6

0.8

None

The main criterion for selection of the size of a distribution for a radial distribution system is

capital cost

voltage drop

corona loss

temperature rise

None

The approximate cost ratio of a 220 kv, underground cable transmission and 220kv/ O/H transmission is

None

Distributers are designed from the point of view of

Voltage drop in it

Its current carrying capacity

Operating frequency

Operating voltage

None

Improving power factor

Increases losses in line

increases the cost of station equipment

Reduces current for a given output

None

A 3-ph, 4-wire system is commonly used for

primary transmission

secondary transmission

secondary distribution

primary distribution

None

A 100 km transmiesion line ia deaigned for a nominal voltage of 132 kV and conaiala of one conductor per phase. The line reactance is 0.726 ohm/km. The static transmission capacity of the line, in Megawatts, would be

240

132

720

416

None

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