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.

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A 3-phase, 11 kv, 50 Hz, 200 kW load has a power factor of 0.8 lag. A delta connected 3-phase capacitor is used to improve the power factor to unity. The capacitance per phase of the capacitor in micro-farads is

3.948

1.316

0.439

11.844

For high-voltage transmission lines, conductors are suspended from towers so as to

Reduce clearance from ground

Take care of increase in length

Increase clearance from ground

Reduce wind and snow effects

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

increases

decreases

uncertain

remains unchanged

Improving power factor

Reduces current for a given output

Increases losses in line

increases the cost of station equipment

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

0.806 ohms per phase

0.0806 ohms per phase

8.06 ohms per phase

80.6 ohms per phase

Insulation coordination for UHV lines (above 500 kv) is done based on

Lightning surges and switching surges

Lightning surges

Switching surges

A dc line carries

Less power than an equivalent ac line

Same power as an ac line

More power than the ac line

Which of the following distribution systems is preferred for good efficiency and high economy

3-ph, 4-wire system

3-ph, 3-wire system

2-ph, 3-wire system

Single-phase, 2-wire system

The most accurate and versatile method of achieving reactive power compensation is by using

Switched capacitor with controlled reactors

Switched capacitors

Fixed capacitor with controlled reactor

Saturable reactor with capacitor bank

A three phase 50 Hz line consists of three conductors each of diameter 21 mm, The spacing between the conductors all follows: A – B = 3m, B – C = 5m, C – A = 3.6m If the line operates at 132 k V, the reactive voltampere generatd by the line per km is

51.70 kVAr

40.0 kVAr

51.07 kVAr

60.5 kVAr

Transposition of transmission line is done to

Reduce line loss

Balance line voltage drop

Reduce skin effect

Series capacitor is used in a transmission line to

Compensate the voltage drop

Limit short ckt current

Reduce line loss

Improve load power factor

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

Electrical resistivity

Specific gravity

Thermal conductivity

Melting point

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

19.6 mH

50.0 mH

23.8 mH

45.3 mH

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

1000 kWh

950 kWh

1100 kWh

1050 kWh

66 kv is suitable for transmission of power over

60 km

120 km

30km

200 km

Guy wire is employed for

Providing protection against surges

Supporting the pole

Providing emergency earth route

Conductors used in HT transmission lines are stranded because of

Reduced resistivity

Cheaper in cost

Ease in handling

Increased tensile strength

By increasing the transmission voltage double of its original value, the same power can be despatched keeping the line loss

Equal to its original value

One-forth of original value

Half of original value

Double the original value

Distributers are designed from the point of view of

Operating voltage

Operating frequency

Voltage drop in it

Its current carrying capacity

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