What material is use for making the armature of an electric bell?
Soft iron
Silver
An alloy of iron and steel
Copper
The materials which are attracted by magnets are called
Ferromagnetic
Paramagnetic
Bar magnets
Electromagnets
Removal of the property of magnetization is called
Magnetization
Electromagnetic induction
Demagnetization
Paramagnetism
Which of the following is used to decrease a.c potential?
A.C generator
D.C generator
Step-up transformer
Step-down transformer
Which of the following is used to measure the current in a circuit ?
Galvanometer
Ammeter
Voltmeter
Rheostat
Which of the following is most commonly used galvanometer?
Pivoted type galvanometer
Suspended type galvanometer
Moving coil galvanometer
All the above
Which of the following gives the presence and direction of flow of current in any circuit?
Most electric motors used in industry are
Induction motors
D.c generator
The speed of the motor can be increased by increasing
Magnetic strength
Current
Number of turns in the coil
Which of the following is used to increase a.c potential?
Step-down transformers