Stepper Motors MCQ’s

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This set of Control Systems Multiple Choice Questions & Answers (MCQs) focuses on “Stepper Motors”.

1. In a three-stack 12/8-pole VR motor, the rotor pole pitch is
a) 15º
b) 30º
c) 45º
d) 60º

2. A stepper motor having a resolution of 300 steps/rev and running at 2400 rpm has a pulse rate of- pps.
a) 4000
b) 8000
c) 6000
d) 10,000

3. A variable reluctance stepper motor is constructed of ______________ material with salient poles.
a) Paramagnetic
b) Ferromagnetic
c) Diamagnetic
d) Non-magnetic

4. If a hybrid stepper motor has a rotor pitch of 36º and a step angle of 9º, the number of its phases must be
a) 4
b) 2
c) 3
d) 6

5. A stepping motor is a ____________ device.
a) Mechanical
b) Electrical
c) Analogue
d) Incremental

6. Which of the following phase switching sequence represents half-step operation of a VR stepper motor ?
a) A, B, C,A……..
b) A, C, B,A…….
c) AB, BC, CA, AB……..
d) A, AB, B, BC……..

7. The rotor of a stepper motor has no
a) Windings
b) Commutator
c) Brushes
d) All of the mentioned

8. The rotational speed of a given stepper motor is determined solely by the
a) Shaft load
b) Step pulse frequency
c) Polarity of stator current
d) Magnitude of stator current.

9. A stepper motor may be considered as a ____________ converter.
a) Dc to dc
b) Ac to ac
c) Dc to ac
d) Digital-to-analogue

10. What is the step angle of a permanent-magnet stepper motor having 8 stator poles and 4 rotor poles?
a) 60º
b) 45º
c) 30º
d) 15º

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