SEM III YEAR

Which of the following motor rotates in discrete angular steps?

• 1. Servo motor

• 1. DC motor

• 1. Stepper motor

• 1. Linear Induction Motor (LIM)

The stator and rotor of the ________ have the same number of poles and hence, the same pole pitch.

• 1. Single stack variable reluctance stepper motor

• 1. Multi stack variable reluctance stepper motor

• 1. Permanent Magnet stepper motor

• 1. Hybrid stepper motor

The _________ is a combination of the features of the Variable Reluctance Stepper Motor and Permanent Magnet Stepper Motor.

• 1. Multi stack variable reluctance stepper motor

• 1. Hybrid stepper motor

• 1. Servo motor

• 1. None of the above

The rotational speed of a given stepper motor depends on

• 1. Magnitude of supply voltage.

• 1. Polarity of stator current.

• 1. Magnitude of stator current.

• 1. Step pulse frequency.

What is the angle between stator direct axis and quadrature axis?

• 90°

• 0°

• 45°

• 60°

The variation of reluctance Rl with space angle θ_r depends on the shape of __________

• stator poles

• rotor poles

• stator or rotor poles

• both stator and rotor poles

For a given reluctance motor, Rl_d and Rl_q are ________

• constant

• varying

• zero

• all of the mentioned

. For which of the applications a reluctance motor is preferred

• Electric shavers

• Refrigerators

• Singnalling and timing devices

• Lifts and hoists

Which of the following motors is generally used for electric shavers

• Universal motor

• Shaded-pole motor

• Reluctance motor

• Hysteresis motor

Which of the following motors is generally used in toys

• Reluctance motor

• Hysteresis motor

• Shaded-pole motor

• Two-value capacitor motor