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56) As the load is increased, the speed of the shunt motor
remains constant
2) The rotating part of a dc motor is known as
pole
49) For which of the following dc motors is the typical field of application mentioned?
Shunt motor : electric trains
7) The speed of a dc motor is
Directly proportional to back emf and inversely proportional to flux
5) Voltage equation for dc motor is
V = Eb + IaRa
3) The function of the commutator in dc machine is
To change alternating current to direct current
4) Carbon brushes are used in electric motors to
Brush off carbon deposits on the commutator
13) If speed of a dc shunt motor increases, the back emf
increases
8) The highest speed attained by a dc shunt motor is
equal to infinity of rated flux
12) The speed of a dc shunt motor is required to be more than F.L. speed. This is possible by
increasing the armature current
11) 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
to reduce the speed of the motor
9) In a dc motor iron losses occur in
the yoke
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