Which of the following galvanometer has very high sensitivity?
Pivoted type galvanometer
Suspended type galvanometer
Moving coil galvanometer
All the above
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
Direction of induced current is given by
Fleming’s left hand rule
Fleming’s right hand rule
Lenz’s law
Newton’s law
Most electric motors used in industry are
Induction motors
D.c generator
Step-up transformer
Step-down transformer
A device is used to transform 12 V d.c. to 200 V a.c.What is the name of the device?
Generator
The strength of an electromagnet increases if
The current in the coil increases
The number of turns in the coil increases
the poles are moved close together
Which of the following is used to decrease a.c potential?
A.C generator
D.C generator
What material is use for making the armature of an electric bell?
Soft iron
Silver
An alloy of iron and steel
Copper
Which of the following converts mechanical energy to electrical energy?
Electric bell
Electric heater
Electric iron
Which of the following is used to increase a.c potential?
Step-down transformers
