The universal motor
is a type of electric motor that can operate on either AC or DC power and uses an electromagnet as its stator to create its magnetic field.
Which motor can operate on AC as well as DC voltage?
A universal motor
is a special type of motor which is designed to run on either DC or single phase AC supply. These motors are generally series wound (armature and field winding are in series), and hence produce high starting torque (See characteristics of DC motors here).
Which motor can be run either with AC or DC supply Mcq?
25.
A universal motor
can be run either on a.c. or d.c. true.
Can a DC motor run on AC?
In fact,
DC Series can run on both AC and DC supply
. But the original AC series motor has the different construction from a DC series motor. Because of the manufacturer design the AC Series motor to reduce losses.
Which motor works with both AC and DC supply?
The universal motor
can work on both AC and DC. However, a series motor that is mainly designed for DC operation, it works on single-phase AC supply suffers from the following drawbacks.
Which power is mentioned on a name plate of a motor?
Which power is mentioned on a name plate of a motor? Explanation: Name plate of the motor shows
rated values i.e. rated speed, rated current, rated voltage
. It also shows output power available at shaft when all other quantities are set to rated values.
What is the speed of DC motor?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and
1000-5000 rpm for DC fractional hp motors
.
Do all motors have capacitors?
Answer: There are three common types of single-phase motors named capacitor motor, shaded pole motor and split phase motors. Shaded pole and split phase single-phase motors do not require a capacitor to run. While
capacitor motors run with the help of capacitors
.
What will happen if we give DC supply to AC motor?
The D.C. motor may run if the A.C. supply is given. If there is a parallel connection, it
won’t rotate at all
and will start humming, as the positive and negative cycle will cancel out each other.
Why are DC motors more expensive than AC?
Cost. DC motors generally cost significantly more than AC motors
due to their higher manufacturing costs
. Also, because AC induction motors have such widespread use, economies of scale contribute to their relatively lower price.
Why are starters required in a DC motor?
Starters are used
to protect DC motors from damage
that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.
What are the three basic principles that allow an electric motor to operate?
Types. Electric motors operate on three distinct physical principles:
magnetism, electrostatics and piezoelectricity
. In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force, and thus a torque on the motor shaft.
What will happen if by mistake the primary of a transformer is connected to the DC supply?
If the primary of a transformer is connected to the DC supply,
the flux produced in the primary will be of constant magnitude because of DC current
. … So the transformer can be damaged due to this high current, if it is connected to DC supply.
Which DC motor is universal motor?
This is a type of
AC commutator motor
. Although mainly used on single-phase AC, it rotates on both AC and DC power. It is also called a “universal motor” or “commutator motor”.
Which DC motor has maximum self loading property?
You can study other questions, MCQs, videos and tests for Electrical Engineering (EE) on EduRev and even discuss your questions like Which DC motor has got maximum self-loading property? a)Series motorb)Shunt motorc)Cumulatively compounded motord)Differentially compounded motorCorrect answer is option ‘D’.
Why is the DC motor preferred over AC motor?
Because DC motors have
higher starting torque compared to AC motors
, they are preferred for applications like electrical traction. They are considered ideal for dealing with heavy loads for starting conditions in machines such as locomotives and cranes.
