WorksheetsDC MOTOR
Total questions: 16
Worksheet time: 9mins
DC MOTOR CONVERTS ------- ENERGY INTO ----------ENERGY
MECHANICAL, ELECTRICAL
ELECTRICAL, MECHANICAL
KINETIC, POTENTIAL
WHICH DEVICE IS CONSTRUCTION-WISE THE SAME AS DC MOTOR?
DC GENERATOR
TRANSFORMER
INDUCTOR
AS PER FLEMING'S LEFT-HAND RULE THUMB FINGER SHOWS THE
DIRECTION OF MAGNETIC FIELD
DIRECTION OF CURRENT
DIRECTION OF FORCE
AS PER FLEMING'S LEFT-HAND RULE MIDDLE FINGER SHOWS THE---------
DIRECTION OF FORCE
DIRECTION OF MAGNETIC FIELD
DIRECTION OF CURRENT
WHAT IS BACK EMF?
THE VOLTAGE OPPOSES THE SUPPLY VOLTAGE
THE VOLTAGE DOES NOT OPPOSE THE SUPPLY VOLTAGE
SUPPLY VOLTAGE
BACK EMF OF DC MOTOR IS----------
Eb = PΦNZ / 60A
EB = PΦN / 60AZ
EB = PΦZ / 120AN
The brushes in an electric motor
the split rings that rotate in a motor
the coil that create the electromagnetic field
Are spring loaded connectors that carry electricity to the rotor by brushing against the commutator as it rotates
the magnets surrounding the rotor
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
The input power to a DC Motor is 40kW. If the efficiency is 80%, determine the output power of the motor?
(a)
The part of an electric motor that doesn't spin is called the...
armature
commutator
stator
bearings
In the image shown, the dark grey shapes are called:
Brushes
Armatures
Commutators
Windings
WHAT IS TORQUE?
TWISTING FORCE
KINETIC FORCE
MAGNETIC FORCE
The rotor is the name of the part that is
the rotating coil inside the stator's field
the stationary magnets around the rotating coil
the spring loaded parts that contact the commutator
the split ring that carries electricity to the coil
The brushes in an electric motor
the split rings that rotate in a motor
the coil that create the electromagnetic field
Are spring loaded connectors that carry electricity to the rotor by brushing against the commutator as it rotates
the magnets surrounding the rotor
Which rule can be used to work out which way a coil of wire rotates in a motor?
Fleming's left-hand rule
Fleming's right-hand rule
The input power to a DC Motor is 40kW. If the efficiency is 80%, determine the output power of the motor?
(a)
