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What is the role of a capacitor in a circuit?

Recent questions tagged dc

1 answer 16 views

Why does the speed of a DC shunt motor decrease as the load increases?

asked Jul 5 in DC motor by Shimroz123
1 answer 31 views

Is the power line voltage available in our homes a dc or an ac voltage?

asked Jun 29 by Shimroz123
1 answer 51 views

Describe the reason of using dc series motor for electric trains.

asked Sep 18, 2018 in Electrical Machine by Shimroz123
1 answer 119 views

State superposition theorem applied to D.C. circuits.

asked Sep 6, 2018 by Shimroz123
1 answer 13 views

State maximum power transfer theorem for DC circuit.

asked Sep 6, 2018 by Shimroz123
2 answers 24 views

State any four advantages of A. C. over D. C . 

asked Sep 4, 2018 by Shimroz123
1 answer 20 views

Define- (i) Node (ii) Loop for a DC circuit

asked Sep 2, 2018 by Shimroz123
2 answers 360 views

Do you think is DC better than AC to transmit energy?

asked Aug 11, 2018 in Electric Power Transmission by nbattack
2 answers 317 views

Distinguish between AC and DC.

asked Aug 8, 2018 by Quiz
1 answer 23 views

For a DC circuit capacitor is

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 33 views

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 15 views

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 23 views

We connected a 35V dc supply to a resistance of 600 Ohm in series with an unknown resistance R.A. voltmeter having a resistance of 1.2 kOhm is connected across 600 Ohm resistance and read 5v. The value of resistance R will be

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

The main advantage of AC over DC is:  (A) Conversion flexibility from one voltage level to other (B) AC can be easily converted into DC by using a rectifier (C) AC is easy to maintain & can be easily distributed at long distances (D) All of the above

asked May 8, 2018 in Electrical Engineering by Shimroz123
1 answer 13 views

What will happen if the primary of a transformer is connected to D.C. supply?  (A) Transformer will operate with low efficiency (B) Transformer will operate with high efficiency (C) No effect (D) Transformer may start to smoke and burn 

asked May 8, 2018 in Electrical Engineering by Shimroz123
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 32 views

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively

asked May 3, 2018 in Electrical Machine by Shimroz123
2 answers 35 views

The fall in speed of a dc generator due to increase in load can be corrected by  (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

asked May 1, 2018 in Electrical Machine by Shimroz123
2 answers 43 views

In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 39 views

A dc chopper is fed from a constant voltage mains the duty ratio of chopper is progressively increased while the chopper feeds an RL load. The per unit current ripple would  (1) increase progressively  (2) decrease progressively  (3) decrease to a minimum value at α = 0.5 and then increase  (4) increase to a maximum value at α = 0.5 and then decrease

asked Apr 30, 2018 in Power Electronics 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 16 views

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor :  (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

asked Apr 30, 2018 in Electrical Engineering by Shimroz123
1 answer 9 views

Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and under compound  (C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

asked Apr 30, 2018 in Electrical Machine by Shimroz123
1 answer 15 views

In a 2 kW, 200 V, 1000 rpm. DC series motor the torque at full load was found to be 0.3 N -m. The torque at half full load in N -m is :

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

In a DC generator the windings of interpoles are connected :  (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation.  (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation.  (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.

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 16 views

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is  (1) 1000V (2) 100V (3) 600V (4) 10,000V

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 31 views

Aluminium is not used as winding wire for the armature of a dc machine because  (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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

The function of a brush and commutator arrangement in a dc motor is to  (1) produce unidirectional torque (2) produce unidirectional current in the armature (3) help in changing the direction of rotation of the armature (4) reduce sparking

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 17 views

In a dc machine, interpoles are used to  (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

asked Apr 29, 2018 in Electrical Machine by Shimroz123
1 answer 31 views

A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

asked Apr 29, 2018 in Network Analysis by Shimroz123
1 answer 9 views

In a DC motor, it is important to place the brushes along ______ A) Magnetic Neutral Axis B) Normal Geometric Axis C) Nominal Geometric Axis D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 27 views

Which of the following motors can run on both AC and DC? A) Universal motor B) Dual wattage motor C) Flexible motor D) All the above

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

A circuit that binds the upper or lower extreme of a waveform to a fixed DC voltage level is called ______ A) DC voltage restorer B) Clamping circuit C) Both A and B D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 80 views

Consider a circuit with three parallel branches connected across a DC supply. What is the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio of 2 : 3 : 4 respectively? A) 2 : 3 : 4 B) 6 : 4 : 3 C) 4 : 3 : 2 D) None of these

asked Apr 29, 2018 in Electrical Engineering by Shimroz123
1 answer 57 views

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

asked Apr 28, 2018 in Power Electronic Controlled Drives by Shimroz123
1 answer 23 views

The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 18 views

The magnetic neutral plane shifts in a dc machine (A) in the direction of motion of motor (B) in the direction of motion of generator (C) due to increase in the field flux (D) cause reduction of flash over between commutator segments

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

In a 4-pole wave winding connected dc motor, the cross-magnetizing AT/pole for a brush shift of θ radians (A) Armature amp-conductors × (θ/360o) (B) Armature amp-turns × (θ/360o) (C) Armature amp-conductors × (1/4 - θ/360o) (D) Armature amp-conductors × (1/8 - θ/360o)

asked Apr 28, 2018 in Electrical Engineering by Shimroz123
1 answer 19 views

A 200 V, 5 A d.c. energy meter is tested at its marked ratings. The resistance of the pressure circuit is 8000 Ω and that of current coil is 0.1 Ω. The power consumed when testing the meter with phantom loading with current circuit excited by a 6 V battery is (A) 2.5 W (B) 5 W (C) 32.5 W (D) 35 W

asked Apr 28, 2018 in Electrical Measurements and Instrumentation by Shimroz123
1 answer 14 views

A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 22 views

A d.c. motor can be looked upon as d.c. generator with the power flow?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 12 views

The Eb/V ratio of a d.c. motor is an indication of its?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 39 views

The normal value of the armature resistance of a d.c. motor is?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 15 views

The counter e.m.f. of a d.c. motor?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 30 views

In a d.c. motor, unidirectional torque is produced with the help of

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 66 views

In DC motor iron losses are occurred in?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 47 views

The power factor of a D.C. circuit is always?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123
1 answer 15 views

All the rules and laws of D.C. circuit also apply to A.C. circuit containing?

asked Mar 25, 2018 in Electrical Engineering by Shimroz123

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