Electric Generator

Q. What is the speed of electricity ?

Q.

What is meant by electric polarization?

Q.

The device used for converting mechanical energy to electrical energy is called a/an________.

1. motor

2. galvanometer

3. dynamo

4. ammeter

Q.

What is the function of brushes in an electric generator ?

Q.

Explain the construction and working principle of an electric motor.

Q. Explain the working of AC generator.

Q. Give three advantages of DC over AC..

Q.

A cylindrical lens is used by a person suffering from?

1. presbyopia

2. myopia

3. astigmatism

4. hypermetropia

Q.

What is myopia? How can it be corrected?

Q.

Which of the following devices works on the principle of electromagnetic induction?

1. Galvanometer

2. Voltmeter

3. Generator

4. Ammeter

Q.

An electric generator converts :

(a) electrical energy into mechanical energy

(b) mechanical energy into hear eneregy

(c) electrical energy into chemical energy

(d) mechanical energy into electrical energy

Q.

What are the practical applications of the maximum power transfer theorem?

Q. Why does USA use DC instead of AC

Q.

What is the function of brushes in electric motor and generator?

Q.

How many types of transformers are there?

Q.

An electric generator converts ----------------energy into electrical energy

Q.

What type of generator is used at Power Stations ?

Q. Question 16
Explain the underlying principle and working of an electric generator by drawing a labelled diagram. What is the function of brushes?

Q.

State one advantage of using an A.C over D.C.

Q.

At what (i) voltage and (ii) frequency is the a.c supplied to our houses?

Q.

An electric generator works on the principle of electromagnetic induction.

1. True
2. False

Q.

Which of the following devices convert electrical energy into mechanical energy?

1. Electric generator

2. Ammeter

3. Loud speaker

4. Electric motor

Q.

The essential difference between an AC generator and a DC generator is that:

1. AC generator has an electromagnet while a DC generator has permanent magnet.

2. AC generator has split rings while DC generator has slip rings.

3. AC generator has slip rings while DC generator has split rings.

4. AC generator will generate a higher voltage.

Q.

Does a transformer convert $AC$ to$DC$$?$

Q.

What is the SI unit of magnetic induction?

Q.

In an A.C. generator, the speed at which the coil rotates is doubled. How would this effect (a) the frequency of the output voltage, (b) the maximum output voltage?

Q. Describe the principle, construction and working of AC and DC generator.

Q.

What determines the frequency of a.c. produced in a generator ?

Q. what is the energy density of electric field at a distance of 5m from a point source of EMwave if the electric field strength at that point be 100v/m

Q.

Out of an A.C . generator and a D.C. generator:

(a) which one uses a commutator (split rings) ?

(b) which on uses slip rings ?