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Recent questions tagged phase

1 answer 52 views

Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

asked Sep 22, 2018 in Energy Conservation And Audit by Shimroz123
1 answer 97 views

Split phase induction motor

asked Sep 20, 2018 in Electrical Machine by Zeeshan
1 answer 10 views

What is Phase sequence? Draw waveforms of 3 phase emf.

asked Sep 7, 2018 by Shimroz123
1 answer 7 views

Define balanced 3 phase load.

asked Sep 7, 2018 by Zeeshan
1 answer 15 views

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

asked Sep 6, 2018 by Shimroz123
1 answer 4 views

State the use of:- (i) Clip-on-ammeter (ii) Phase sequence indicator

asked Sep 6, 2018 by Shimroz123
2 answers 3 views

State the meaning of creeping error in 1 phase energy meter.

asked Sep 6, 2018 by Shimroz123
1 answer 11 views

List any two methods of reactive power measurement in 3 phase circuit.

asked Sep 6, 2018 by Shimroz123
1 answer 4 views

Define balanced and unbalanced load in three phase circuit.

asked Sep 6, 2018 by Shimroz123
1 answer 6 views

Describe the following errors and their compensation: (i) Phase error (ii) Speed error

asked Sep 6, 2018 by Shimroz123
2 answers 10 views

Describe with neat diagram phase sequence indicator.

asked Sep 6, 2018 by Shimroz123
1 answer 72 views

State any two disadvantages of one wattmeter method of measurement of 3 phase power.

asked Sep 6, 2018 by Shimroz123
1 answer 24 views

State the application of phase sequence indicator; clip on ammeter, frequency meter & P.F. meter.

asked Sep 5, 2018 by Shimroz123
1 answer 19 views

Draw and explain RC phase shift Oscillator.

asked Sep 4, 2018 by Shimroz123
1 answer 36 views

State any four applications of three phase circuits.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 45 views

For a balanced three phase star connected load for which line voltage is 230V and per phase resistance and reactance is 6 Ohm and 8 Ohm respectively. Calculate: 1) phase voltage 2) line current 3) power factor 4) total power absorbed

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
2 answers 50 views

Write the relation between phase and line current, phase and line voltage for Star connection.

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 50 views

What is line voltage and phase voltage? Draw balanced three phase star connected system. Show all the voltages and currents.

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 35 views

Define phase sequence of three phase supply with waveforms. What is normal phase sequence? Which 3 standard colours are used to denote the phase sequence?

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
1 answer 58 views
2 answers 62 views

State any four advantages of three phase over single phase.

asked Aug 11, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 65 views

Write short notes on 3 phase AC system.

asked Aug 11, 2018 in Electrical Engineering by Shimroz
1 answer 14 views

In an R-C phase shift oscillator, the minimum no. of R-C networks to be connected in cascade will be -

asked May 8, 2018 in Electrical Engineering 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
1 answer 45 views

A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

asked May 3, 2018 in Power system by Shimroz123
1 answer 11 views

Oscillator independent of phase shift is  (1) Relaxation (2) Wein bridge (3) Clapp (4) All of these

asked Apr 30, 2018 in Power Electronics by Shimroz123
1 answer 39 views

Phase margin is the amount of angle to make the system  (1) Oscillatory (2) Stable (3) Unstable (4) Exponential

asked Apr 30, 2018 in Control System by Shimroz123
1 answer 28 views

The armature current on symmetrical 3 phase short circuit of a synchronous machine (salient pole)  (A) has q -axis current only (B) has d -axis current only (C) has both d and q axis currents (D) cannot be divided between q and d axis currents

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 60 views

The slip of 400 V, three phase, 4 -pole induction motor when rotating at 1440 rpm is 

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 18 views

What is the slip (as a percentage) when a 6 pole single phase induction motor operating on 220 V and 60 Hz is rotating at speed of 1140 rpm? A) 60% B) 5% C) 10% D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 26 views

When the phase difference between two sinusoidal quantities is 90° they are said to be ______ A) Phase right angle B) Phase quadrature C) Phase sinuright D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 24 views

A 230 V, 50 Hz phase controlled single-phase full-controlled SCR bridge converter draws 15 A constant dc current. If the source inductance is 3 mH, the drop in dc output voltage is (A) 4.5 V (B) 6.75 V (C) 9 V (D) 13.5 V

asked Apr 28, 2018 in Power Electronics by Shimroz123
1 answer 33 views

In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell

asked Apr 28, 2018 in Electronics Engineering by Shimroz123
1 answer 446 views

A single core cable is designed to work for a single phase system with a peak voltage of 220 kV. The maximum permissible stress in the dielectric is not to exceed 20 kV/mm. For economical size, the overall core diameter of the cable is (A) 28.2 mm (B) 26.4 mm (C) 24.4 mm (D) 22.0 mm

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 23 views

When a V-V three phase transformer system is converted into a Δ-Δ system, increase in capacity of the system is (A) 86.6% (B) 50% (C) 57.7% (D) 73.2%

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 100 views

Phase modifier is normally installed

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 28 views

The disc of a single phase Induction-type energy meter makes 60 revolutions in 6 minutes. Meter Constant is 1200 rev/kWh. Power consumption in the load is (A) 1.2 kW (B) 1 kW (C) 600 W (D) 500 W

asked Apr 25, 2018 in Instrumentation and control by Shimroz123
1 answer 47 views

The potential coil of a single phase dynamometer wattmeter has 4840 Ohm resistance. Voltage across the load is 220 V. With the potential coil connected on the load side, the meter indicates 100 W. Approximate percentage error due to wattmeter connection is (A) 11% (B) 9% (C) 1.1% (D) 3%

asked Apr 25, 2018 in Instrumentation and control by Shimroz123
1 answer 54 views

The product of apparent power and cosine of the phase angle between circuit voltage and current is?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

In a three-phase supply floating neutral is undesirable because it way give rise to?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value ?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 600 views

The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
1 answer 73 views

The power consumed in a circuit element will be least when the phase difference between the current and voltage is?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Two waves of the same frequency have opposite phase when the phase angle between them is?

asked Mar 24, 2018 in Electrical Engineering by Shimroz123

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