APPSC Electrical Engineering Paper III 03 April 2019 Question Paper with Answers Key

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APPSC Electrical Engineering Paper III 03 April 2019 Question paper with Answers Key- APPSC conducted Assistant Executive Engineers in Various Engineering Services exam on 03 April 2019 FN from 10.00 AM to 12.30 PM. Here we are providing some of the questions asked in APPSC Electrical Engineering Paper III Paper.

In a transmission system, the weight of copper used is proportional to?

1/E²

The skin effect of a conductor reduces with the increase in?

Resistivity of the conductor material

The inductance of a transmission line is minimum when?

GMD is low and GMR is high

The capacitance of an overhead transmission line increases with?

Increases in mutual geometrical mean distance, Increase in height of conductors above ground

What is the empirical formula to calculate the number of strands?

3n (n+1) + 1

The presence of ground causes the line capacitance to?

Increases by about 0.2%

The values of A, B, C and D constants for a short transmission line are respectively?

1, Z, 0 and 1

APPSC Electrical Engineering Paper III 03 April 2019 Paper

The sag of the conductors of a transmission line is 2.5 m, when the span is 250 m. Now if the height of supporting tower is increased by 25%, the sag will?

Remain unchanged

Strain type insulators are used?

Any of (At dead ends or At intermediate anchor towers)

Grading ring is used to equalize the potential distribution across the units of the suspension insulator because it?

Forms capacitances which help to cancel the charging current from link pins

The insulation resistance of a single-core cable is 200 MΩ/km. The insulation resistance for 5 km length is?

40 MΩ

If the frequency of a transmission system is changed from 50 Hz to 100 Hz, the string efficiency?

Remain unchanged

A string insulator has 4 units. The voltage across the bottom most unit is 30% of the total voltage. Its string efficiency is?

83.33%

A suspension type insulator has three units with self-capacitance C and ground capacitance of 0.2 C having a string efficiency of?

78%

Electrical Engineering Paper III

APPSC Electrical Engineering Paper III 03 April 2019 Questions and answers

Grading of cables?

Reduces insulation cost and increases current rating

The intersheaths in cables are used to?

Provide proper stress distribution

Dielectric hysteresis loss in a cable varies as?

(Impressed voltage) 2

The maximum short-circuit current occurs in the case of?

Three-phase bolted fault

If the positive, negative and zero-sequence reactances of an element of a power system are 0.3, 0.3 and 0.8 p.u respectively, then the element would be a?

Transmission line

A 10 kVA, 400 V/200 V single-phase transformer with 10% impedance, draws a steady short-circuit current of?

250 A

In case of an unbalanced star-connected load supplied from an unbalanced 3-phase, 3-wire system, load currents will consists of?

Only Positive-sequence components and Negative-sequence components

APPSC  Electrical Engineering Paper III 03 April 2019 paper with  Key

The major function of the condenser is to?

Reduce the back pressure so that maximum heat energy can be extracted from steam

In coal-fired thermal power stations, what are the electrostatic precipitators used for?

To collect the dust particles from the flue gases

In a medium or high head hydroelectric power station, a surge tank is provided to?

Control the pressure variations in the penstock pipes due to sudden load changes

A hydel power plant of run-off-river type should be provided with pondage, so that the?

Firm capacity of the plant is increased

A super critical boiler is one that operates above the pressure and temperature of the following values?

218 kg/cm2 and 5400 degree C

Maximum efficiency of modern coal fired steam-raising thermal power plants is restricted to about 0.35, mainly because of?

High energy loss from turbine exhaust to condenser

Taking the density of water to be 1,000 kg/m3 , how much power would be developed by a hydroelectric generator unit, assuming 100% efficiency, with 1.0 m head and 1.0 m3 /s discharge?

9.80 Kw

APPSC Electrical Engineering Paper III Answers Key 03 April 2019

A heavy water reactor is …….?

Has higher neutron flux which can be produced at a given power level

Tarapur atomic power station has?

Boiling water reactors

In distance protection, the relay measures?

Positive sequence impedance of the line from relay up to the fault point

The most efficient torque-producing actuating structure for induction-type relay is?

Induction-cup structure

The operating characteristics of a reactance relay in the complex impedance plane is a?

Straight line parallel to the X-axis

The efficiency of a nuclear power plant is less than that of a conventional fuel fired thermal plant because of?

Low temperature and pressure conditions

The radiation shield for a nuclear power reactor for biological safety is provided by having the reactor?

Encased by thick concrete wall

APPSC Electrical Engineering Paper III 03 April 2019 Full Question Paper& Key

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