191. The current drawn by a dc motor at starting is
- zero
- very low
- normal
- very high
192. High inrush of current during a starting of a dc motor can efficiently be restricted to a safer value by increasing the ________ resistance.
- Shunt field
- armature circuit
- both (1) and (2)
- none of these
193. For efficient operation of a dc motor, the additional resistance inserted in the armature circuit should be
- increased in steps
- cut-out in steps
- left in the armature circuit
- removed immediately after start
194. In dc shunt motors, at start, the field excitation is kept at maximum value in order to
- reduce starting torque
- increase acceleration duration
- reduce armature heating
- avoid voltage dip in the supply mains
195. If starter is not used with large dc motor for starting, it will draw a starting current which
- is many times its rated full load current
- will produce excessive voltage drop in line
- may damage the armature and commutator
- all the above
196. The function of a starter in a dc motor is to
- control its speed
- increase its starting torque
- limit the starting current to a safer value
- reduce armature reaction effect
197. Direct-on-line(DOL) starters are not suitable for starting large dc motors, because
- the starting current will be enormously high, which will cause large voltage drop in the supply mains
- the motor may not start
- the motor may run away
- the starting torque becomes low
198. In a dc shunt motor, the three point starter
- limits the starting current to a safer value
- provides overload protection
- provides no-volt protection
- all of the above
199. A 3-point starter is considered suitable for dc ______ motors.
- series
- shunt
- compound
- shunt as well as compound
200. The dc motor started handle should be moved
- very slowly in steps
- smoothly in steps
- quickly
- with a jerk to final position
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