When a dc series motor is connected to AC supply the power factor will be low because of?

When a D.C. series motor is connected to A.C. supply, the power factor will be low because of high inductance of field and armature circuits.

When a dc series motor is connected to AC supply the power factor will be low because of MCQ?

When an AC supply is given to the DC series motor then there will be high inductance in field and armature circuits which causes low power factor.

What happens when a dc series motor is connected to AC supply?

What will happen if you connect a dc motor to an ac source? When the ac source changes polarity, the current in the motor will reverse. But the reversal will occur in both the armature winding and the field winding. Therefore, the torque on the armature will remain in the same direction.

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What will happen if a single phase supply is connected to an ordinary DC series motor?

The torque produced will be. of zero average value. pulsating and unidirectional.

Why field winding of a dc series motor is provided with thick wire?

in order to reduce eddy current to provide large flux. as it carries large load current. as it carries large load current. …

Which motor has no rotor winding?

The rotor of which motor does not have winding on it ? cause its somewhat works like squirrel cage induction motor.

When a universal motor is operated on no load its speed is limited by?

supply voltage frequency.

Can a DC fan run on AC?

Fans can run on both AC as well as DC according to the circuitry used inside it. … As our power sources are AC , so we have to convert a AC motor fan to DC to be able to use. DC fans consume 70% less power than the AC fans.

Can you convert a DC motor to AC?

Typically, converting from DC technology to AC will save your process 20-30% in energy consumption. The conversion not only changes the active motors to AC but also the controlling variable speed drives.

Which DC motor can run on AC supply?

AC motors can run on both single-phase and three-phase supplies. (1) Effect of AC supply on DC Shunt Motor: We already know that if we interchange the terminals of a DC shunt motor the rotation of the motor does not change. So you can say that a DC Shunt motor can run on AC Supply.

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How do I know if a motor is AC or DC?

Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).

What is cogging and crawling?

The important characteristics normally shown by a squirrel cage induction motors are crawling and cogging. These characteristics are the result of improper functioning of the motor that means either motor is running at very slow speed or it is not taking the load.

Which of the following is best braking method?

Explanation: Plugging is the best braking method among all braking techniques. In plugging the value of the armature current reverses and the mechanical energy is extracted. A very high braking torque is produced in case of plugging. 2.

Which DC motor has maximum self loading property?

Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load.

Why is the DC motor preferred over AC motor?

DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.

When load is removed motor will run at the highest speed?

1 Answer. When load is removed, series motor will run at the highest speed.