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Why thyristor are not preferred for inverter?

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In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called armature.

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1 answer 15 views

The induced e.m.f. in the armature conductors of a d.c. motor is?

asked Mar 26, 2018 in DC motor by Shimroz123
2 answers 74 views

UNIT 1 fundamentals of AC rotating machine Contents 1.1 Introduction 1.2 Advantages 1.3 Parts of AC machines 1.4 Synchronous speed 1.5 AC winding 1.6 Winding factor (Coil pitch and distributed winding) 1.7 Distribution factor 1.8 EMF equation of alternator or generator 1.9 Numericals 1.10 Harmonic 1.11 Slot harmonics 1.12 Harmonics minimization

asked Aug 25, 2018 in Electrical Machine by Notes
1 answer 10 views

Which law states that induced e.m.f and current always opposes the cause producing them?

asked May 29, 2018 in Electrical Engineering 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 21 views

Which of the following quantity maintains the same direction whether a D.C. machine runs as a generator or as a motor a. Induced e.m.f. b. Armature Current c. Field Current d. Supply Current  

asked Sep 1, 2018 by Shimroz123
1 answer 15 views

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?

asked Mar 21, 2018 in DC generator by Shimroz123
1 answer 25 views

According to Fleming's right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of?

asked Mar 20, 2018 in DC generator by Shimroz123
2 answers 23 views

Losses which occur in rotating electric machines and do not occur in transformers are?

asked Mar 19, 2018 in Transformer 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 21 views

Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be?

asked Mar 25, 2018 in Basic concepts 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
0 answers 16 views

The voltage regulation of an alternator having 0.75 leading p.f. load, no-load induced e.m.f. of 2400V and rated terminal voltage of 3000V is —————————————  A) 20% B) —20% C) 150 D) -26.7

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 18 views

The e.m.f. induced in the primary of a transformer:  (A) is in phase with the flux (B) lags behind the flux by 90 degree (C) leads the flux by 90 degree (D) is in phase opposition to that of flux

asked Apr 9, 2018 in Electrical Engineering 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 55 views

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?

asked Mar 21, 2018 in DC generator by Shimroz123
1 answer 6 views

These self inductance of a circuit is defined as twice the work done against the induced e.m.f. on establishing unit current in the coil. If the current to be established in the coil is doubled, the work done against the induced e.m.f. will be  1. Doubled  2. Halved  3. four times  4. Quarter times 

asked May 13, 2018 in Electrical Engineering by Shimroz123
1 answer 54 views

The function of steel wire in ACSR conductors is (A) To take care of surges. (B) To reduce corona. (C) To reduce inductance. (D) To provide additional mechanical strength

asked May 8, 2018 in Electric Power Transmission by Shimroz123
1 answer 95 views

"In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order ... sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources". The above statement is associated with?

asked Mar 25, 2018 in Network Analysis by Shimroz123
1 answer 66 views

For protection of rotating machines against lightning surges _______ is used.  (1) lightning arrester (2) capacitor (3) combination of lightning arrester and capacitor (4) lightning conductor and arrester

asked Apr 30, 2018 in Switchgear And Protection by Shimroz123
1 answer 42 views

what is mean by rotating transformer ?

asked Aug 19, 2017 in Electrical Machine by Zeeshan
1 answer 14 views
1 answer 16 views

Which have more free electrons: conductors or insulators? 

asked Jul 1 by Zeeshan
1 answer 93 views

Why synchronous machine is called doubly excited machine?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 12 views

Name two good conductors, two good insulators, and two semiconductors.

asked Jun 29 by Shimroz123
0 answers 100 views

Analyze the differences of FOC and DTC. The switching frequency of FOC is 1.3 kHz and the average switching frequency of DTC is the same.

asked Jun 23, 2018 in Electrical Machine by Erdemuysal
1 answer 18 views

As there is no back e.m.f. at the instant of starting a D.C. motor, in order to prevent a heavy current from flowing though the armature circuit?

asked Mar 20, 2018 in Electrical Machine by Shimroz123
1 answer 17 views

Which machine is the exciter of synchronous machine?

asked Mar 18, 2018 in Synchronous 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 32 views

What is the percentage of stray losses in DC machine?

asked Mar 8, 2018 in Electronics Engineering by Quiz

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