NEW
Font size
Worksheetsdc motor
Total questions: 11
Worksheet time: 6mins
In a DC Motor, the coil of the rotor turns into an electromagnet when
the rotor rotates inside the stator
electricity (current) flows through the coil
the rotor is turned by the axle
the it sits int the field of the stator
The part of an electric motor that doesn't spin is called the...
armature
commutator
stator
bearings
A coil carries a current in a magnetic field. The coil experiences a turning effect.
Which device uses this effect?
a DC motor
an electromagnet
a relay
a transformer
How do u obtain desired speed of an armature controlled DC motor ?
by varying armature current
by varying the armature voltage
by varying emf
by varying transformer voltage
Which factors not
affecting the speed of dc motors?
Flux
Current
Applied voltage.
Voltage across the armature
GENERATOR CONVERTS ------ ENERGY INTO ----- ENERGY
MECHANICAL, ELECTRICAL
ELECTRICAL, MECHANICAL
POTENTIAL,KINETIC
BACK EMF OF DC MOTOR IS----------
Eb = PΦNZ / 60A
EB = PΦN / 60AZ
EB = PΦZ / 120AN
WHAT IS BACK EMF?
THE VOLTAGE OPPOSES THE SUPPLY VOLTAGE
THE VOLTAGE DOES NOT OPPOSE THE SUPPLY VOLTAGE
SUPPLY VOLTAGE
WHAT IS TORQUE?
TWISTING FORCE
KINETIC FORCE
MAGNETIC FORCE
WHICH DEVICE IS CONSTRUCTION-WISE THE SAME AS DC MOTOR?
DC GENERATOR
TRANSFORMER
INDUCTOR
THE WORKING PRINCIPLE OF DC MOTOR IS---------
MUTUAL INDUCTION
FLEMING'S RIGHT HAND
LORENTZ LAW
