Single Phase Motor Questions Answers

121. The rotor of a stepper motor has

(a) no windings.
(b) no commutator.
(c) no brushes.
(d) all of the above. [A.M.I.E. Sec B. Summer 2004]

122. In a stepper motor, the detent torque means

(a) minimum of the static torque with the phase winding excited.
(b) maximum of the static torque with the phase winding excited.
(c) minimum of the static torque with the phase winding unexcited.
(d) maximum of the static torque with the phase winding unexcited. [GATE E.E. 2008]

123. For a given stepper motor, the following torque has the highest numerical value

(a) Detent torque.
(b) Pull-in torque.
(c) Pull-out torque.
(d) Holding torque. [GATE E.E. 2004]

124. Which one among the following has the highest numerical value in a stepper motor?

(a) detent torque.
(b) Holding torque.
(c) Dynamic torque.
(d) Ripple torque.

125. Switched reluctance motor means

(a) salient pole synchronous motor without excitation winding.
(b) a stepper motor with salient poles.
(c) synchronous motor with salient poles on stator and rotor.
(d) a stepper motor with closed loop control and with rotor position sensor. [I.E.S. E.E.-II, 2001]

126. The following motor definitely has a permanent magnet rotor:

(a) DC commutator motor.
(b) Brushless dc motor.
(c) Stepper motor.
(d) Reluctance motor. [GATE E.E. 2004]

127. The motor which can produce uniform torque from standstill to synchronous speeds is

(a) universal motor.
(b) stepper motor.
(c) reluctance motor.
(d) hysteresis motor. [A.M.I.E. Sec B. Summer 2004]

128. Stepper motors are mostly used for

(a) high power requirements.
(b) control system applications.
(c) very high speed of operation.
(d) very low speed of operation. [A.M.I.E. Sec B. Summer 2000] [U.P.S.C. I.E.S. E.E.-II, 2002]

129. Stepper motors are widely used because of

(a) wide speed range.
(b) large rating.
(c) no need for field control.
(d) compatibility with digital systems. [U.PS.C. I.E.S. E.E.-11, 2002]

130. Which one of the following types of motors is most suitable for a computer printer drive?

(a) Reluctance motor.
(b) Hysteresis motor.
(c) Shaded pole motor.
(d) Stepper motor. [I.E.S. 2004; GATE 1996]

 

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