AC and DC Generators

What is commulator?

In a $\mathrm{DC}$ generator, brushes are made of

What converts mechanical energy to electrical energy.

Which device uses slip rings?

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

Which of the following statements is correct?

Draw a diagram of an AC generator and describe it. Derive an expression for instantaneous value of induced emf.

How can we simply connect AC generator into DC generator:

Differentiate Between AC and DC generator

What Does an AC Generator Mean.

Which of the following statements is correct.

If frequency of an AC generator is doubled, the maximum value of emf induced in its coil will:

A coil of $500$ turns and area $100 {\mathrm{cm}}^2$ is placed at right angles to a magnetic field of $5\times {10}^{-2} \mathrm{Wb}/{\mathrm{m}}^2$. If the speed of rotation is $300 \mathrm{rps}$, what is the maximum value of induced e.m.f. in the coil?

At which position of the plane of the rotating coil with the direction of magnetic field, the e.m.f. induced in the coil is maximum?

In most AC generators, the coils are held stationary and magnetic field is rotated.

A square coil of $20$ turns has sides of length $10 \mathrm{cm}$. The flux density in which the coil rotates is $10 \mathrm{Wb}/{\mathrm{m}}^2$. What is the angular velocity of the coil if the maximum e.m.f. produced is $200 \mathrm{V}$?

A coil of $200$ turns and area $200 {\mathrm{cm}}^2$ is placed at right angles to a magnetic field of $3\times {10}^{-2} \mathrm{Wb}/{\mathrm{m}}^2$. If the speed of rotation is $400 \mathrm{rps}$, what is the maximum value of induced e.m.f. in the coil?

At time $t=0 \mathrm{s}$, voltage of an A.C. Generator starts from $0 \mathrm{V}$ and becomes $2 \mathrm{V}$ at time $t=\frac{1}{100\pi }$ second. The voltage keeps on increasing up $100 \mathrm{V}$, after which it starts to decrease. Find the frequency of the Generator.

In an AC generator, a coil with $N$ turns, all of the same area $A$ and total resistance $R$, rotates with angular frequency $\omega$ in a magnetic field $B$. The maximum value of emf generated in the coil is