Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 26, Problem 6SQ
To determine
Explain how the starter provides smooth acceleration and a gradual increase of torque.
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what article of NEC states ungrounded conductor of the motor starter is it necessary to open both the ungrounded conductor and the neutral in a single phase motor
A generating station is to supply four regions of load [15MW,10 MW,20MW,3MW].
The diversity factor at the station is 1-6. Calculate:
(i) The maximum demand on the station.
(ii) Suggest the installed capacity and the number of units.
NOT: Taking installed capacity to be 20% more than the maximum demand.
Pick up the correct answer
1. Most of the high-voltage transmission lines are
A. Underground.
B. Overhead
2. High-voltage transmission lines use
A. Suspension insulators
C. Wireless D. None of them.
B. Pin insulators
C. Both A and B
D. None of them.
C. Either of the above
D. None of the above
3. The load on distributors systems are generally
A. Balanced
B. Unbalanced
4. A feeder in a transmission system feeds power to
A. Distributors B. Generating stations C. Service mains D. All of the above
5. Corona loss increases with
A. Decrease in conductor size & increase in supply frequency.
B. increase in both conductor size and supply frequency.
C. Decrease in both conductor size and supply frequency.
D. Increase in conductor size and decrease in supply frequency.
6. If the length of a cable is doubled. Its capacitance is
C. Quadrupled D. None of the above
7. The distributors for residential areas are
B. 3-D three wire
B. 20V
C. 3-0 four wire D. None of the above
8. Five photocells are…
Chapter 26 Solutions
Electric Motor Control
Ch. 26 - What is the purpose of inserting resistance in the...Ch. 26 - Why is the power not interrupted when the motor...Ch. 26 - If the starter is to function properly and a...Ch. 26 - How may additional steps of acceleration be added?Ch. 26 - What is meant by the low or poor starting economy...Ch. 26 - Prob. 6SQ
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