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Recent questions tagged current

1 answer 7 views

Alternating current

asked Jul 6 in Wikipedia by Shimroz123
1 answer 14 views

A charge of 0.1 C moves past a given point every 0.01 s. How much is the current?

asked Jul 1 by Shimroz123
1 answer 36 views

Describe the difference between direct and alternating current.

asked Jun 29 by Shimroz123
0 answers 11 views

Explain why potential difference is necessary to produce current in a circuit.

asked Jun 29 by Shimroz123
1 answer 21 views

A) Watt B) Volts C) Farad D) Ampere

asked Jun 28 in Multiple Choice Questions by Shimroz123
1 answer 15 views

Kirchhoff's current law

asked Jun 11 by Shimroz123
1 answer 10 views

Current ratio

asked Jun 11 by Shimroz123
1 answer 15 views

Current divider rule

asked Jun 11 by Shimroz123
1 answer 12 views

Current formula

asked Jun 11 by Shimroz123
1 answer 17 views

Capacitive current

asked Jun 11 by Shimroz123
2 answers 46 views

How to find total impedance Z, current I and Impedance angle ?

asked May 30 by Shimroz123
1 answer 56 views

Why inductor current lags inductor voltage ?

asked May 24 by Shimroz123
1 answer 7 views

Explain lagging quantity and leading quantity, explain this concept with voltage and current waveform

asked Sep 7, 2018 by Shimroz123
1 answer 10 views

List out any four effects of electric current used in measuring instruments & write name of meter working on it.

asked Sep 6, 2018 by Shimroz123
2 answers 19 views

State various effects of electric current and explain any one.

asked Sep 4, 2018 by Shimroz123
1 answer 67 views

Define: 1) voltage ratio, 2) current ratio, 3) transformation ratio of transformer.

asked Aug 12, 2018 in Basic electrical and electronics engineering by Quiz
0 answers 28 views

Draw the Delta connected three phase system showing all the voltages and currents. Write the power equation.

asked Aug 11, 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
1 answer 27 views

A zener voltage regulator has load requirements of 12 V and 2 A. The zener diode minimum current requirement is 0.2 A. The minimum voltage at input is 24 V. What is the required value of series resistance with source? A) 5.45 Ω B) 6 Ω C) 7.2 Ω D) 6.38 Ω  

asked Jun 18, 2018 in Diode by Shimroz123
1 answer 78 views

 If the base current of a BJT is 250 µA and emitter current is 15 mA, then the common base current gain will be A) 0.98 B) 0.41 C) 59 D) 55  

asked Jun 18, 2018 in Bipolar Junction Transistor by Shimroz123
1 answer 14 views

In a series R-C circuit, with the increase in frequency, current (A) Reduces (B) Increases (C) Does not change (D) Becomes zero

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 12 views

A 1000Ohm, 1 Watt resistor can safely pass a current of

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

The operating point of a protective current transformer is near the

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 29 views

If the fault current is 6000 A, the relay plug setting is 150% and the CT ratio is 400/5, the plug setting multiplier will be

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 14 views

Leakage current flows through the thyristor in

asked May 8, 2018 in Power Electronics by Shimroz123
1 answer 42 views

If the % reactance upto the fault point is 20%, then the short circuit current will be

asked May 8, 2018 in Switchgear And Protection by Shimroz123
1 answer 36 views

Step-down transformer converts high voltage and low current into:  (A) How voltage and high current (B) High voltage and low current (C) Low voltage and high current (D) None of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

Which of the following is the least expensive protection for over current in low voltage system?  (A) Rewireable fuse (B) Isolator (C) Oil Circuit breaker (D) Air break circuit breaker

asked May 8, 2018 in Electrical Engineering by Zeeshan
1 answer 36 views

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

asked May 3, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

The coefficient of reflection for current wave is

asked May 3, 2018 in Physics by Shimroz123
1 answer 27 views

For a round wire, the approximate value of fusing current is given by

asked May 3, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

For arc welding current range is usually  (1) 10 to 15 A (2) 30 to 40 A (3) 50 to 100 A (4) 100 to 350 A

asked Apr 30, 2018 in Utilization of electrical energy by Shimroz123
1 answer 84 views

The skin effect in conductors is due to non uniform distribution of current in it and major portion of current is near the _______ of conductor.  (1) Surface (2) Center (3) Complete cross section area (4) Axis

asked Apr 30, 2018 in Power system by Shimroz123
1 answer 15 views

In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

asked Apr 30, 2018 in Power system by Shimroz123
2 answers 38 views

The inrush current of a transformer at no load is maximum if the supply voltage is switched on  (1) at peak voltage value (2) at zero voltage value (3) at half voltage value (4) at 0.866 time voltage value

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 32 views

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is :  (A) 256 W (B) 320 W (C) 500 W (D) 625 W

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 26 views

A current controlled voltage source is equivalent to :  (A) series voltage feed -back amplifier (B) shunt current feed -back amplifier (C) shunt voltage feed -back amplifier (D) series current feed -back amplifier

asked Apr 30, 2018 in Electrical Engineering 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 41 views

A 3 -phase, fully controlled, converter is feeding power into a DC load at a constant current of 150 A, the rms value of the current flowing through each thyristor of the converter is

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 25 views

When the firing angle a of a single-phase, fully controlled rectifier feeding constant direct current into a load is 30°, the displacement power factor of the rectifier is

asked Apr 29, 2018 in Power Electronics by Shimroz123
1 answer 21 views

In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 30 views

Which of the following theorems enables a number of voltage (or current) source to be combined directly into a single voltage (or current) source. (1) compensation theorem (2) reciprocity theorem (3) superposition theorem (4) Millman's theorem

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 19 views

If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400:5, the plug setting multiplier will be

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 13 views

Which of the following can reduce the Eddy current losses? A) By making the core of a stack of plates electrically insulated from each other B) By making the core of solid block C) By increasing the applied voltage  D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 21 views

A network that consists of at least a voltage source or current source is called A) Active network B) Ideal network C) Sourced network D) Outsourced network

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 25 views

The current flow in a battery is due to ______ A) movement of ions B) movement of protons C) movement of holes D) movement of neutrons

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

In the induction type directional over current relay, when a short-circuit occurs in the circuit (A) power flows in reverse direction (B) power flows in normal direction (C) directional power element does not operate (D) over current element is not energized

asked Apr 28, 2018 in Switchgear And Protection by Shimroz123
1 answer 283 views

The sequence components of current of a single-phase load connected to a 3-phase system are (A) equal positive and negative sequence components (B) equal positive, negative and zero sequence components (C) vector sum of sequence currents is zero (D) algebraic sum of sequence currents is zero

asked Apr 28, 2018 in Power system by Shimroz123
1 answer 26 views

In a single-phase transformer, the magnetizing current is (A) in phase with the no-load current (B) in quadrature with the no-load current (C) the product of no-load current and power factor (D) in phase with the flux in the core

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 16 views

The line current in a balanced delta system is 30 A. The load current is (A) 30√3 A (B) 30/√3 A (C) 10 A (D) 30/√2 A

asked Apr 28, 2018 in Network Analysis by Shimroz123

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