Q1:- A simple method of increasing
the voltage of and dc generator is
1.
To decrease the air gap flux density
2.
To increase the speed of rotation
3.
To decrease the speed of rotation
4.
To increase the length of the armature
ANSWER:-2
Q2:- An external resistance is added in the series with the field of a dc shunt motor .When the motor runs the effect of resistance is
1. To reduce the speed of the motor
2.
To increase the speed of the motor
3.
To reduce the armature current drawn by the
motor
4.
To reduce the losses
ANSWER:-2
Q3:- If the speed of dc generator
is increased the generated emf
1.
Increases
2.
Decreases
3.
Remains constant
4.
First decreases and then increases
ANSWER:-1
Q4:- If the speed of a shunt motor
increases the back emf
1. Increases
2.
Decreases
3.
Remains constant
4.
First decreases and the increases
ANSWER:-1
Q5:- The function of a commutator
in dc generator is
1. To collect current from conductor
2.
To change dc to ac
3.
To conductor the current to the brushes
4.
To change ac to dc
ANSWER:-4
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