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The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as?

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1 answer 28 views

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as?

asked Mar 20, 2018 in Synchronous machine by Shimroz123
1 answer 38 views

What is the maximum value of torque angle in synchronous motor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 20 views

The synchronous motor will develop maximum power when the load angle is?

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

The maximum reluctance power of a salient-pole synchronous motor having direct-axis reactance, 1.0 pu and quadrature-axis reactance, 0.5 pu, and input voltage, 1.0 pu is (A) 0.25 pu (B) 0.5 pu (C) 1.0 pu (D) 1.5 pu

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 32 views

An electric motor in which both stator field and rotor rotates with same speed is called?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 20 views

A change of 4% in the supply voltage to an induction motor will produce a change of approximately

asked May 8, 2018 in Electrical Machine by Shimroz123
1 answer 29 views

The synchronous motor which works on leading power factor and does not drive any mechanical load is called?

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

In a self-controlled synchronous motor fed from a variable frequency inverter  (1) the rotor poles invariably have damper windings  (2) there are stability problems  (3) the speed of the rotor decides stator frequency  (4) the frequency of the stator decides the rotor speed

asked Apr 29, 2018 in Power system by Shimroz123
1 answer 22 views

Synchronous motor always runs at which speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 117 views

The torque developed by any 3-phase induction motor at 0.8 p.u. slip is (A) Full-load torque (B) unstable torque (C) starting torque (D) break down

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

If we change the excitation of synchronous machine will it affect on motor speed?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 28 views

If the load of the normally excited synchronous motor is increased the power factor will?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 22 views

If the field of synchronous motor is under excited, power factor will be?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 15 views

The maximum torque of d.c. motors is limited by?

asked Mar 26, 2018 in DC motor by Shimroz123
1 answer 145 views

what will happen when excitation of an unloaded salient pole synchronous motor suddenly gets disconnected?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 30 views

Torque angle for the synchronous machine is the angle between (A) stator magnetic field and rotor magnetic field (B) stator magnetic field and net magnetic field in the air gap (C) rotor magnetic field and net magnetic field in the air gap (D) excitation voltage and impedance voltage drop

asked Apr 28, 2018 in Electrical Machine by Shimroz123
1 answer 20 views

In a synchronous motor which losses varies with load?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 23 views

Three phase synchronous motor will have how many sliprings?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
0 answers 94 views

The SCR would be turned OFF by voltage reversal of applied anode-cathode ac supply frequency of A) 10 kHz B) 10 Hz C) 5 kHz D) 5 Hz 

asked Jun 18, 2018 in Power Electronics by Shimroz123
1 answer 38 views

The speed of a three-phase induction motor is controlled by variable voltage variable frequency control (i.e. keeping V/f constant). As the frequency is reduced, the slip at maximum torque  (1) Decreases (2) Increases (3) Remains constant (4) None of the above

asked May 1, 2018 in Electrical Machine by Shimroz123
1 answer 28 views

Which motor have more efficiency, synchronous motor or induction motor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 27 views

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

asked Mar 20, 2018 in Synchronous machine 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 35 views

How can we reverse the direction of rotation of synchronous motor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 19 views

The back emf of synchronous motor depends on?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
2 answers 58 views

The synchronous speed of an 8 pole induction motor supplied power from a 50 Hz source will be ?

asked Dec 31, 2017 in Electrical Engineering by Quiz
1 answer 17 views

A synchronous motor can be made self starting by providing?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 17 views

The damping winding in synchronous motor is generally used to?

asked Mar 18, 2018 in Synchronous machine by Shimroz123
1 answer 30 views

Can we use the synchronous motor as the synchronous capacitor?

asked Mar 18, 2018 in Synchronous machine by Shimroz123

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