# The operating speed of a synchronous motor can be changed to new fixed value by?

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The operating speed of a synchronous motor can be changed to new fixed value by changing frequency.

## Related questions

In a synchronous generator if the excitation increased from a low value to normal value, with a fixed load  (A) The armature current increases and the power factor decreases  (B) The armature current decreases and the power factor also decreases  (C) The armature current decreases and the power factor increases but is lagging  (D) The armature current decreases and the power factor increases and is leading

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

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

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

Synchronous motor always runs at which speed?

Why the speed of synchronous motor is constant?

A synchronous motor can be made self starting by providing?

The speed of a D.C. motor can be controlled by varying  1. Its flux per pole 2. Resistance of armature circuit 3. Applied voltage 4. All of the above

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

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

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz

Hunting in synchronous motor cannot be due to?

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

Can we use the synchronous motor as the synchronous capacitor?

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

In a single-phase induction motor, the operating direction is determined by the ________ A) Rotor B) Stator C) Starting circuit D) None of these

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?

The damping winding in synchronous motor is generally used to?

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

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

The speed of a 2-pole, 3-phase stepper motor operated by 1200 pulses/min (A) 100 rpm (B) 200 rpm (C) 400 rpm (D) 800 rpm

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

The back emf of synchronous motor depends on?