DC Generators

In DC machines, lap winding is used for

A dc machine has 8 poles and a rated current of 100A. How much current will flow in each conductor at rated condition if the armature is simplex lap wound?

Shunt generators are used where the main requirement is constant

A 4-pole lap-wound armature has 480 conductors and a flux per pole of 25mWb. What is the emf generated, when running at 600 rpm?

What is the nature of the current flowing in the armature of dc machine?

The current flowing in the armature conductors of a dc motor is

A 10 kW, 110 volts dc series generator has a 2 volts brush drop, an armature resistance \(R_a\) of 0.1 Ω and a series field resistance \(R_s\) of 0.05 Ω. Calculate the generated emf when delivering rated current at rated speed.

Lap winding is best siuited for voltage, current dc generators.

The field current of a 200 kW, 230 volts shunt generator is 8 A when running full-load at rated terminal voltage. If the combined brush and armature resistance is 0.03 Ω, solve for the electrical efficiency of the generator.

The dc armature winding in which the coil sides are placed a pole pitch apart is called winding.

In a 12-Pole duplex lap wound dc armature, each conductor can carry a current of 50 amperes. If the total armature conductor is 600, what is the rated current of the armature?

A 4 pole dc generator has a total of 600 conductors in its lap wound armature. The flux per pole is \(10^{6}\) lines. Determine the generated emf if it is driven at 2400 rpm.

Once residual magnetism of a shunt generator is lost, it may be restored by connecting its shunt field.

A 6-pole lap wound dc generator has 240 armature conductors, a flux of 0.04 Wb per pole and runs at 1,500 rpm. If the armature resistance is 0.8 Ω, determine the current through each conductor.

In a 4-pole dynamo, the flux per pole is 15 mWb. Calculate the maximum emf induced in one of the armature conductors if armature is driven at 600 rpm.

With reference to armature windings, wave windings are often called __________ windings.

The active length of each conductor placed in a DC generator armature is 0.4 m. The armature is rotated at a speed of 1,800 rpm in a magnetic field of average flux density 1.2 T. The diameter of the armature is 0.5 m. Find the emf induced in the conductor when it cuts the magnetic field at right angles.

The purpose of providing dummy coils in a generator is

In a generator, if the voltage regulation is 5.5% and the full-load voltage is 220 volts, what is the no-load voltage?

A 4-pole wave wound generator has 220 coils of 10 turns each. The resistance of each turn is 0.02 Ω. Find the resistance of the armature winding.