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Physics 10 Chapter 15 - Electromagnetism - 6
1.
A D.C. motor converts......................?
a) Mechanical energy into electrical energy
b) Electrical energy into chemical energy
c) Electrical energy into mechanical energy
d) Mechanical energy into chemical energy
2.
What is input in case of D.C motor?
a) Electrical energy
b) Mechanical energy
c) Sound energy
d) Kinetic energy
3.
What is output in case of D.C motor?
a) Sound energy
b) Mechanical energy
c) Light energy
d) Electrical energy
4.
Where are the loops of armature mounted?
a) On the brushes
b) On a commutator
c) On a slip ring
d) On a shaft
5.
Where are the loops of armature mounted?
a) On the brushes
b) On an axle
c) On a slip ring
d) On a commutator
6.
The total force acting on the armature can be increased by?
a) Decreasing the current in the coil
b) Increasing the number of turns of the coil
c) Decreasing the strength of the magnetic field
d) Decreasing the area of the coil
7.
The total force acting on the armature can be increased by?
a) Decreasing the strength of the magnetic field
b) Increasing the current in the coil
c) Decreasing the area of the coil
d) Decreasing the number of turns of the coil
8.
The total force acting on the armature can be increased by?
a) Decreasing the number of turns of the coil
b) Decreasing the area of the coil
c) Decreasing the current in the coil
d) Increasing the strength of the magnetic field
9.
The total force acting on the armature can be increased by?
a) Decreasing the number of turns of the coil
b) Increasing the area of the coil
c) Decreasing the strength of the magnetic field
d) Decreasing the current in the coil
10.
In a practical electric motor, what is the coil called?
a) Brushes
b) Commutator
c) Armature
d) Slip rings
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