Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 8SQ
If there is a locked rotor in the secondary circuit, what will be the value of the frequency?
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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 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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