Q1:- The emf of a dc generator
depends on
1.
Commutation
2.
Speed
3.
Frequency
4.
Brush contact drop
ANSWER:-2
Q2:- The function of the starter
in a dc machines is
1.
To avoid the excessive current at starting
2.
To control the speed
3.
To avoid armature reaction
4.
To avoid excess heating
ANSWER:-1
Q3:- An external resistance added
in the field of a dc shunt generator will
1.
Increase the speed of the generator
2.
Increase the voltage of the generator
3.
Decrease the voltage of the generator
4.
Increase the power delivered
ANSWER:-3
Q4:- The speed of a D.C. shunt
motor is required to be more than F.L. speed. This is possible by
1.
Increasing the armature current
2.
Decreasing the armature current
3.
Increasing the excitation current
4.
Reducing the field current
ANSWER:-4
Q5:- An emf is induced in the
windings of an armature of a dc generator when the armature rotates in
1.
Alternating magnetic flux
2.
Magnetic field
3.
Electrostatic field
4.
Electromagnetic flux
ANSWER:-2
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