Which of the following is used to increase or decrease the amplitude of alternating current?
Transformer
Generator
Electromagnets
Galvanometer
When a low resistance wire is connected in parellel to the coil of galvanometer, it works as
Voltmeter
Ammeter
Electromagnet
The speed of the motor can be increased by increasing
Magnetic strength
Current
Number of turns in the coil
All the above
A d.c motor converts
Electrical energy into mechanical energy
Mechanical energy into electrical energy
Electrical energy into heat energy
Mechanical energy into heat energy
Which of the following converts mechanical energy to electrical energy?
Electric bell
Electric heater
Electric iron
A device is used to transform 12 V d.c. to 200 V a.c.What is the name of the device?
Step-up transformer
Step-down transformer
Moving coil galvanometer
Which of the following is used to measure the current in a circuit?
Rheostat
Which of the following law states the law of conservation of energy?
Fleming’s left hand rule
Fleming’s right hand rule
Lenz’s law
Name the law which helped you to find the direction of the magnetic field lines:
Maxwell’s screw law
Which of the following galvanometer has very high sensitivity?
Pivoted type galvanometer
Suspended type galvanometer
All the above.
