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Between no-load and full-load, .......... motor develops the least torque.

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Between no-load and full-load, series motor develops the least torque.

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1 answer 14 views

An induction motor having full load torque of 60 Nm when delta connected develops a starting torque of 120 Nm. For the same supply voltage if the motor is changed to star connection, the starting torque developed will be  A) 40 Nm B) 60 Nm C) 90 Nm D) 120 Nm

asked May 17, 2018 in Induction Machine by Shimroz123
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A d.c. shunt motor runs at no load speed of 1140 r.p.m. At full load armature reaction weakens the main flux by 5%. Whereas the armature circuit voltage drops by 10%. The full load speed of the motor is (a) 1200 r.p.m. (b) 1080 r.p.m. (c) 1040 r.p.m. (d) 1000 r.p.m.

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asked Jun 4, 2018 in Induction Machine by Shimroz123
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asked May 17, 2018 in DC motor by Shimroz123
1 answer 16 views

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asked May 17, 2018 in Induction Machine by Shimroz123
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asked Apr 29, 2018 in Electrical Machine by Shimroz123
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asked Apr 25, 2018 in Electrical Engineering by Shimroz123
1 answer 16 views

As compared to shunt and compound motors, series motor has the highest torque because of its comparatively .......... at the start.

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 24 views

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asked Apr 29, 2018 in Electrical Engineering by Shimroz123
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1 answer 72 views

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asked Mar 27, 2018 in Transformer by Shimroz123
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asked May 17, 2018 in Induction Machine by Shimroz123
1 answer 9 views

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1 answer 8 views

A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to  (A) 0.75 p.u (B) 0.5 p.u (C) 0.25 p.u (D) 0.125 p.u

asked May 18, 2018 in DC motor by Shimroz123
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An ideal synchronous motor has no starting torque because the  (a) Rotor is made up of salient poles. (b) Relative velocity between the stator and rotor mmfs is zero. (c) Relative velocity between stator and rotor mmfs is not zero. (d) Rotor winding is highly inductive. 

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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 17 views

A 3-phase induction motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following statements relate to the new condition if stator resistance, leakage reactance and core loss are ignored  1. The difference between synchronous speed and actual speed remains same 2. The airgap flux remains same 3. The ... . slip remains same Among the above, current statements are  (A) All (B) 1, 2 and 3 (C) 2, 3 and 4 (D) 1 and 4

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1 answer 42 views

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1 answer 31 views

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A separately excited d.c. motor fed from single phase full converter with firing angle 60° runs at 1000 r.p.m. If motor is connected to single phase semiconverter with the same firing angle of 60°, it would run at (a) 2000 rpm (b) 1850 rpm (c) 1500 rpm (d) 1000 rpm 

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1 answer 22 views

Suggest the energy conservation techniques in following cases : (i) Motor is running with 70% loaded condition. (ii) Motor is continuously loaded at 50%. (iii) Motor runs with 30% loaded condition but sometimes rises to 50% loading condition. (iv) Motor runs continuously under no-load condition.

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A salient pole synchronous motor is running at no load. Its field current is switched off, the motor will (a) come to stop. (b) continue to run at synch. speed. (c) continue to run at a speed slightly less than synch. speed. (d) continue to run at a speed slightly more than the synch. speed. 

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asked May 17, 2018 in Electrical Machine by Shimroz123
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Under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value,  (A) the speed decreases and the stator current increases (B) both the speed and the stator current decreases (C) the speed and the stator current remain practically constant (D) there is negligible change in the speed but the stator current decreases

asked May 17, 2018 in Induction Machine by Shimroz123
1 answer 23 views

The power factor of an induction motor under no load conditions will be close to (A) 0.2 lagging (B) 0.2 leading (C) 0.5 lagging (D) Unity

asked May 12, 2018 in Induction Machine by Shimroz123
1 answer 56 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
0 answers 11 views

The reading of wattmeter in no load test of induction motor gives : (A) Friction and windage loss (B) Copper losses on no load in the stator (C) Core losses (D) Sum of all losses

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1 answer 8 views

Why shouldn’t a DC shunt motor start on the heavy load setting?

asked Jul 5 in DC motor by Shimroz123
1 answer 14 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 12 views

With the increase in load on a d.c. shunt motor, speed of the motor (a) increases proportionately (b) remains constant (c) increase slightly (d) reduces slightly 

asked May 25, 2018 in DC motor by Shimroz123
1 answer 10 views

To conduct load test on a dc shunt motor, it is coupled to a generator which is identical to the motor. The field of the generator is also connected to the same supply source as the motor. The armature of generator is connected to a load resistance. The armature resistance is 0.02 p.u. Armature reaction and mechanical losses can be neglected. ... rated armature current in both motor and generator. The p.u value of this load resistance is  (A) 1.0 (B) 0.98 (C) 0.96 (D) 0.94

asked May 18, 2018 in DC motor by Shimroz123

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