# For power factor correction, synchronous motors operate at?

20 views

For power factor correction, synchronous motors operate at no-load and greatly over-excited fields.

## Related questions

Draw and explain bulk correction method for power factor & control.

Capacitors for power factor correction are rated in?

The benefit of power factor correction in a power system is (A) lower power consumption (B) increased demand charge (C) reduced load carrying capabilities in existing lines (D) reduced voltage profile

What is the use of power factor correction?

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

If we change the excitation of synchronous machine will it affect on power factor?

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

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

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

In a synchronous generator delivering lagging power factor load  (1) the excitation emf leads terminal voltage by the power angle (2) the excitation emf lags terminal voltage by the power angle (3) excitation emf leads the terminal voltage by the power factor angle (4) excitation emf lags the terminal voltage by the power factor angle

The power factor angle and torque angle of a salient pole synchronous generator drawing a current of 1.0 pu from a lagging load are 45o and 15o, respectively. The direct axis and quadrature axis currents, respectively, are (A) 0.5 pu, 0.866 pu (B) 0.866 pu, 0.5 pu (C) 0.707 pu, 0.707 pu (D) 0.5 pu, 0.5 pu

Can a synchronous condenser improve power factor?

How can we improve power factor using synchronous motor?

Damper winding is provided in 3 phase synchronous motors to :

What is the difference between synchronous and asynchronous motors?

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

The efficiencies of transformers compared with that of electric motors of the same power are?

The power factor at resonance in R-L- C parallel circuit is?

At which power factor alternator is said to be overexcited?

In an alternator at lagging power factor the generated voltage per phase as compared to that at unity power factor?

At which time power factor of the induction motor is low?

What is the power factor when a single phase watt meter operating on 200 V and 5 A for 5 hours makes 2016 revolutions and the meter constant in revolution is 420? A) 0.04 B) 1.04 C) 0.96 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?

A three-phase synchronous motor connected to ac mains is running at full load and unity power factor. lf its shaft load is reduced by half and field current is held constant then its new power factor will be

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

Discuss how power factor tariff results into energy conservation.

State the incentives and penalties related with power factor tariff.

With a neat sketch explain working of 1 phase dynamometer type power factor meter.

State the significance of power factor.

A transformer has negative voltage regulation when its load power factor is   (1) Zero (2) Unity (3) Leading (4) Lagging

The power factor of dielectric :  (A) is a function of temperature of the dielectric only (B) depends only on voltage stress to which the dielectric is stressed (C) always constant (D) both (A) and (B)

Power station having Load factor = 70%, capacity factor = 50%, used factor = 60%, maximum demand = 20MW then annual energy production is  (1) 122.8 GWh (2) 198.55 GWh (3) 128.2 GWh (4) 188.82 GWh

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

The ratio of active power to apparent power is known as____ factor.

The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?