111. If the back emf in a dc motor vanishes suddenly, the motor will
- start hunting
- burn
- run at very high speed
- run at very slow speed
112. The output power of any electrical motor is taken from the
- armature
- field
- coupling mounted on the shaft
- motor frame
113. The armature shaft must be able to withstand
- any unbalanced magnetic pull on the armature core
- twisting strains due to transmission of torque
- bending moment due to weight of the armature and commutator
- all of the above
114. The direction of rotation of a dc motor can be determined by
- fleming’s right hand rule
- fleming’s left hand rule.
- lenz’s law
- ampere law.
115. The direction of rotation of a dc shunt motor can be reversed by interchanging
- the supply terminals
- the field terminals only
- the armature terminals only
- either field or armature terminals
116. When the supply terminals of a dc shunt motor are interchanged
- the motor will stop the motor will run at its normal speed in
- the same direction as before
- the direction of rotation will reverse
- the motor will run much faster in the same direction
117. The direction of rotation of a dc series motor can be reversed
- by interchanging supply terminals
- by interchanging field terminals
- either by interchanging supply terminals or by interchanging field terminals
- by interchanging supply terminals as well as field terminals
118. The direction of rotation of a dc compound motor can be reversed by interchanging ________ Connections
- armature
- series field
- shunt field
- armature and series field both
119. The speed of the dc motor is
- directly proportional to back emf and flux
- directly proportional to its back emf and inversely proportional to flux
- inversely proportional to both back emf and flux
- directly proportional to flux and inversely proportional to back emf
120. When is the mechanical power developed by a dc motor maximum?
- back emf is equal to applied voltage
- back emf is equal to zero
- back emf is equal to half the applied voltage
- none of the above
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