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In case of a steam engine an average coal consumption per km is nearly 28 to 30 kg.

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In the case of an unsymmetrical alternating current the average value must always be taken over?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
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asked May 8, 2018 in Electric Power Generation by Shimroz123
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 An independent voltage source in series with an impedance ZS=R+jXS delivers a maximum average power to a load impedance ZL when A) ZL = R B) ZL = jXS C) ZL = R-jXS D) ZL = R+jXS 

asked Jun 18, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased, then (A) It would over-run the other alternator (B) Its rotor will fall back in phase with respect to the other machine (C) Its portion of share in load will increase (D) Its power factor would be decreased.

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asked Apr 29, 2018 in Electric Power Generation by Shimroz123
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asked Sep 7, 2018 by Shimroz123
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asked Apr 29, 2018 in Electric Power Generation by Shimroz123
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asked Sep 7, 2018 by Shimroz123
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asked Apr 10, 2018 in Computer Engineering by Shimroz123
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A 10 kW electric motor drives a vehicle at an average speed of 50 Km/h. Ten, 12 V, 100A-h batteries supply the motor, the maximum distance that the vehicle may travel before the batteries must be recharged, will be : (A) 30 Km (B) 45 Km (C) 60 Km (D) 80 Km

asked Mar 31, 2018 in Electrical Engineering by Shimroz123
1 answer 17 views

In a 3-phase half-wave rectifier, if per phase input is 200 V, then the average output voltage is   (a) 233.91 V (b) 116.95V (c) 202.56 V (d) 101.28V 

asked May 13, 2018 in Power Electronics by Shimroz123
1 answer 15 views

The following formula is correct:  (A) Load factor=Average load for a period/ Peak load for the same period  (B) Load factor=Average load for a period x Peak load for the same period  (C) Load factor=Average load for a period + Peak load for the same period  (D) All of the above

asked May 8, 2018 in Power system by Shimroz123
1 answer 20 views

A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of the line, its ideal power transfer capability in MW is (A) 1204 MW (B) 1504 MW (C) 2085 MW (D) 2606 MW

asked May 25, 2018 in Power system by Shimroz123
0 answers 15 views

Voltages phasors at the two terminals of a transmission line of length 70 km have a magnitude of 1.0 per unit but are 180 degree out of phase. Assuming that the maximum load current in the line is 1/5th of minimum 3-phase fault current. Which one of the following transmission line protection schemes ... pick up at 1.25 times the maximum load current (C) Pilot relaying system with directional comparison scheme (D) Pilot relaying system with segregated phase comparison scheme

asked May 25, 2018 in Power system by Shimroz123
0 answers 17 views

A three phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 0.97 mH/km per phase and capacitance is 0.0115 mF/km per phase. Assume a loss less line. Determine the line wavelength (a line phase constant).  (A) 1250 km (B) 6578 km (C) 4990 km (D) 2445 km 

asked Apr 5, 2018 in Electrical Engineering by Shimroz123
1 answer 52 views

The corona loss on a particular system at 50 Hz is 1 kw/phase per km. The corona loss on the same system with supply frequency 25 Hz will be?

asked Mar 27, 2018 in Power system by Shimroz123
0 answers 14 views

Velocity of an electron (in km/S) starting at rest and travelling to a point 100 V above the starting potential is around  A) 3600 B) 4000 C) 5100 D) 6000

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 40 views

The inductance of single phase two wire power transmission line per km gets doubled when the  (a) Distance between wires is doubled  (b) Distance between the wires is increased four fold  (c) Distance between the wires is increased as square of the original distance  (d) Radius of the wire is doubled

asked May 13, 2018 in Electric Power Transmission by Shimroz123
1 answer 23 views

For 11kV line the inductance per km per phase will be of the order of:  (A) 1 H (B) 0.1 H (C) 1 mH (D) 0.1 mH

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 18 views

For 11 kV line the capacitance per km per phase will be of the order of:  (A) 1 Farad (B) 0.1 Farad (C) 0.01 Farad (D) 0.01 microF

asked May 8, 2018 in Electric Power Transmission by Shimroz123
0 answers 18 views

It is desired to illuminate a drawing hall with an average illumination of about 250 lux. The area of hall is 30 m × 20 m. The lamps are to be fitted at 5 m height. Find the number and size of incandescent lamps required for an efficiency of 12 lumen/watt. Utilization factor = 0.4 and maintenance factor = 0.85.   (a) 40 and 1000 W (b) 20 and 500 W (c) 60 and 1000 W (d) None of the above 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

 In the case of an instrument reading of 8.3 V with a 0 to 150 voltmeter having a guaranteed accuracy of 1% full scale reading, the percentage limiting error is   (A) 1.810% (B) 0.181% (C)12.45% (D) 0.0018%

asked May 17, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 91 views

An alternator has a phase sequence of RYB for its phase voltage. In case the direction of rotation of alternator is reversed, the phase sequence will become?

asked Mar 27, 2018 in Power system by Shimroz123
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1 answer 22 views

The steam input in to a turbogenerator connected to infinite bus is increased. Which of the events will take place? (a) The generator will feed more leading KVAR to bus bar and power angle will not change (b) The generator will feed more real power to bus bar and power angle will increase (c) The generator will feed more power to bus bar and power angle will decrease (d) The generator will feed more lagging KVAR to bus bar and power angle will not change

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
0 answers 18 views

The auxiliary power consumption in a thermal power plant is (A) 2-5% (B) 5-10% (C) 10-15 % (D) 15-20%

asked May 13, 2018 in Electric Power Generation by Shimroz123

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