In an a.c. electric motor, the direction of current in the coil change

1.	In an a.c. electric motor, the direction of current in the coil changes once in every:
A.	two rotations of the coil
B.	one rotation of the coil
C.	half rotation of the coil
D.	one-fourth rotation of the coil
Answer» D. one-fourth rotation of the coil

Discussion

No Comment Found

Related MCQs

Absolute permeability of a free space is:
In an electric magnetic circuit, for establishing a magnetic field:
Calculate the value of current flowing through a conductor (at rest) when a straight wire 3 m long (denoted as AB in the given figure) of resistance 3 ohm is placed in the magnetic field with the magnetic induction of 0.3 T.The conductor is connected to a voltage source of 3 V.
A rectangular iron core has three coils as shown in the given figure. The number of turns of the coils are Na = 300, Nb = 600 and Nc = 600, and the respective currents are 1.5 A, 4 A and 3 A. Find the total magnetomotive force.
In parallel magnetic circuit, the total ampere turn is equal to the:
In the magnetic circuit shown, below what is the flux density produced if the relative permeability of the core material under the given condition is 1000?
A solid non-magnetic conductor of circular cross section has its axis on z-axis and carries a uniformly distributed total current of 60 A in the az direction. If the radius of the conductor is 4 mm, find the magnetic flux density at ρ = 5 mm
A conductor of axial length 30 cm carries a current of 100 A and lies at right angle to a magnetic field of strength 0.4 tesla. What is the force exerted on it?
If the current element represented by 4 × 10-4 ây Amp-m is placed in a magnetic field of \(\bar H = \frac{{5{{\hat a}_x}}}{\mu }A/m\), the force on the current element is
Consider a scenario in a DC motor. When a conductor of Length "L" is placed inside a magnetic field of strength "H", flux density "B" and current "I" is flowing through the conductor, then what will be the magnitude of force F acting on it?

In an a.c. electric motor, the direction of current in the coil changes once in every:

Discussion

No Comment Found

Related MCQs

Reply to Comment