WorksheetsGATE -Electrical Machines
Total questions: 20
Worksheet time: 10mins
____ is followed to determine the direction of coil movement for electric motors
Fleming's left hand rule
Faraday's left hand rule
Faraday's right hand rule
Fleming's right hand rule
What does the thumb indicate in Fleming's left hand rule
Force
Current
Magnetic field
Voltage
What is the direction of coil movement in the image shown
Towards the magnet
Away from the magnet
In the direction of current flow
Downwards
Choose all that applies to a DC Shunt motor
Field winding has more number of turns of thin wires
High starting torque
Constant Speed Motor
Used in electric cars
A d.c. generator whose field magnet winding is supplied from an independent external d.c. source:
Self Excited DC generator
Separately excited DC generator
The direction of the induced emf in generators is found out using:
Fleming's right hand rule
Fleming's left hand rule
Faraday's left hand rule
Right hand thumb rule
Speed of the induction motor reduces with the load applied
True
False
The difference between the speed of the stator and the actual speed is called
(a)
- In DC motor speeds above the rated speed are usually increased by changing which of the following winding current:
field winding
armature winding
either field or armature winding
none of these
which symbol is used to represent electrical flux?
ϕ
H
B
A
how can we select the thickness of fuse wire?
based on load current
based on voltage
both
none
