Alternating Current Test

Result

Alternating Current Test - 3

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Question 1
1 / -0

Alternating current cannot be measured by dc ammeter because

A
AC cannot pass through dc ammeter

B
Average value of complete cycle is zero

C
AC is virtual

D
AC changes its direction

Solution

n dc ammeter, a coil is free to rotate in the magnetic field of a fixed magnet. If an alternating current is passed through such a coil, the torque will reverse its direction each time the current changes direction and the average value of the torque will be zero.
Question 2
1 / -0

AC generator is based on the principle of ___________.

A
potential energy

B
electromagnetic difference

C
electromagnetic induction

D
potential difference

Solution

AC generator produces electrical energy from mechanical work. It is based on the principle of electromagnetic induction which states that the whenever magnetic flux linked with conductor changes, an emf is produced.
Question 3
1 / -0

Which of the following statement is true about the AC generator?

A
It works on the principle of electromagnetic induction.

B
a pair of slip rings are used in the AC generator

C
it converts the mechanical work into electrical energy.

D
All of the above.

Solution

AC generator produces electrical energy from mechanical work. It is based on the principle of electromagnetic induction which states that the whenever magnetic flux linked with conductor changes, an emf is produced.

The end of the coil is connected to two slip rings used to commutate the power to the circuit connected with loads.
Question 4
1 / -0

The currents induced in a bulk pieces of conductor, where the magnetic flux linked with it changes, are known as ____________.

A
induced current

B
back current

C
eddy current

D
none of the above

Solution

The currents induced in a bulk pieces of conductor, where the magnetic flux linked with it changes, are known as eddy current. When bulk pieces of conductors are subjected to changing magnetic flux, induced currents are produced in them. Since their flow patterns resemble swirling eddies in water, it was called eddy current.