161. The ratio of the starting torque to full load torque is minimum in case oft be used for centrifugal pumps?
- cumulative compound motors
- differential compound motors
- shunt motors
- series motors
162. Which of the following dc motors will have highest percentage increase of input current, for the same percentage increase in torque?
- series
- shunt
- cumulative compound
- all equal
163. Which of the following dc motor has least drop in speed from no load to rated full load?
- series motors with interpoles
- series motor without interpoles
- shunt motor with interpoles
- cumulative compound motors with interpoles
164. A dc motor is drive the load which is almost nil for certain part of the load cycle and peak value for short duration. The most suitable dc motor is
- cumulative compound
- differential compound
- shunt
- series
165. The motor used for punching machine is usually subjected to
- full load continuously
- part of full load continuously
- no load
- intermittent load
166. The speed of the dc motor depends upon
- flux per pole
- applied voltage to armature
- voltage drop in armature circuit resistance
- all of the above
167. The field flux method of speed control of dc shunt motor is generally used for which one of the following
- constant hp drive below the base speed
- constant torque drive above the base speed
- constant torque drive below the base speed
- constant hp drive above the base speed
168. The resistance of the field regulator of a dc shunt motor is of the order of
- 100
- 10
- 2
- 0.5
169. A dc shunt motor is fitted with the field regulator for speed control. For a constant load torque the speed will be minimum for a regulator resistance of
- infinite
- zero
- half
- none of these
170. The dc shunt motor is supplying the load at its rated speed. The speed can be reduced by
- armature circuit resistance control
- field resistance control
- ward leonard control
- any of the above
Please ,send the answer because I need answer to correct my result
Click the “correct answer” under each question to see the answer.