Connect 1 Semester Access Card For Electric Motors And Control Systems
Connect 1 Semester Access Card For Electric Motors And Control Systems
2nd Edition
ISBN: 9781259550195
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
Question
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Chapter 2.4, Problem 8RQ
To determine

(a)

Motor terminology used to define the current drawn by motor at standstill with rated voltage and rated frequency applied.

To determine

(b)

Motor terminology used to define the twisting and turning force of a motor.

To determine

(c)

Motor terminology used to define difference between speed of rotating magnetic field and speed of rotor shaft of motor.

To determine

(d)

Motor terminology used to define a device which provides adjustable time period to perform function.

To determine

(e)

Motor terminology used to define a device which is operated by change in one electrical circuit to control a device in same circuit or in other circuit.

To determine

(f)

Motor terminology used to define running overcurrent motor protection.

To determine

(g)

Motor terminology used for braking a motor by reversing its direction of rotation.

To determine

(h)

Motor terminology used for reduced voltage applied at motor during starting.

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If we double the number of poles on the stator of an induction motor, will its syn- chronous speed also double? The rotor of an induction should never be locked while full voltage is being applied to the stator. Explain. Why does the rotor of an induction motor turn slower than the revolving field?
a. Calculate the synchronous speed of a 3-phase, 12-pole induction motor that is excited by a 60 Hz source. b. What is the nominal speed if the slip at full-load is 6 percent?
A 3-phase, 75 hp, 440 V induction motor has a full-load efficiency of 91 percent and a power factor of 83 percent. Calculate the nominal current per phase.

Chapter 2 Solutions

Connect 1 Semester Access Card For Electric Motors And Control Systems

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