Which of the following converts mechanical energy to electrical energy?
Electric bell
Electric heater
Generator
Electric iron
The speed of the motor can be increased by increasing
Magnetic strength
Current
Number of turns in the coil
All the above
Which of the following is used to increase a.c potential?
A.C generator
D.C generator
Step-up transformer
Step-down transformers
Which of the following gives the presence and direction of flow of current in any circuit?
Ammeter
Galvanometer
Voltmeter
Rheostat
Which of the following is most commonly used galvanometer?
Pivoted type galvanometer
Suspended type galvanometer
Moving coil galvanometer
Which of the following is used to increase or decrease the amplitude of alternating current?
Transformer
Electromagnets
Which of the following statement is true?
The magnetism induced in iron and steel is temporary
The magnetism induced in iron and steel is permanent
The magnetism induced in iron is permanent while in steel is temporary
The magnetism induced in iron is temporary while in steel is permanent
The materials which are attracted by magnets are called
Ferromagnetic
Paramagnetic
Bar magnets
Direction of induced current is given by
Fleming’s left hand rule
Fleming’s right hand rule
Lenz’s law
Newton’s law
What material is use for making the armature of an electric bell?
Soft iron
Silver
An alloy of iron and steel
Copper