DC GENERATORS QUIZ

For a D.C. machines laboratory following type of D.C. supply will be suitable

Induction motor D.C. generator set

Synchronous motor D.C. generator set

Mercury are rectifier

Rotary converter

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The armature core of a D.C. generator is usually made of

Nonferrous material

Copper

Silicon steel

Cast-iron

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In a wave winding, the commutator pitch is approximately equal to

Twice the pole pitch

Pole pitch

Thrice the pole pitch

None of the listed here

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While applying Fleming's right-hand rule to and the direction of induced e.m.f., the thumb points towards

Direction of flux

Direction of motion of the conductor if forefinger points in the direction of generated e.m.f.

Direction of motion of conductor, if forefinger points along the lines of flux

Direction of induced e.m.f.

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The yoke of a dc machine is made of

Silicon steel

Soft iron

Aluminum

Cast steel

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The armature copper loss in a dc generator is a

Variable loss

Stray loss

None of the listed here

Constant loss

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In case of D.C. machine winding, number of commutator segments is equal to

Number of armature coils

Number of armature conductors

Number of armature coil sides

Number of armature turns

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In a dc generator, armature reaction _____ pole tip.

Strengthns the flux at the leading

Weaknes the flux at the leading

Weaknes the flux at the trailing

None of the listed here

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In a commutator

Mica is harder than copper

None of the listed here

Copper is harder than mica

Mica and copper are equally hard

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The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be

600 V

620 V

640 V

580 V

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