Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 4, Problem 4RQ
All values of a transformer are proportional to its _________________.
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Service output is used only to experience the system.
true or false
Choice the correct answer of the following statements:
1. The power transmitted of two pulleys connected by an open belt or crossed belt is
a) directly proportional to their diameters; b) inversely proportional to their diameters;
proportional to the square of their diameters;
c) directly
d) inversely proportional to the square of their diameters.
2. Two pulleys of diameters d1 and d2 and at distance x apart are connected by means of an open belt
drive. The length of the belt is:
a) π/2 (d: + d₂) 2x + (d: + dz)/4x; b) n/2 (d₁-dz) 2x + (di-dz)/4x; c) n/2 (d: +d₂) 2x + (di-d₂}/4x;
d) π/2 (d₁-də) 2x + (d: +d₂)²/4x.
3. In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then:
a) open belt drive is recommended; b) cross belt drive is recommended; c) both open belt drive and
cross belt drive are recommended; d) the drive is recommended depending upon the torque
transmitted.
4. Due to not slip of the belt, the power transmitted of the belt drive:…
The value of Vg-Vf at critical
point is *
O infinity
two
O one
zero
Chapter 4 Solutions
Electrical Transformers and Rotating Machines
Ch. 4 - What is a transformer?Ch. 4 - What are common efficiencies for transformers?
Ch. 4 - What is an isolation transformer?Ch. 4 - All values of a transformer are proportional to...Ch. 4 - A transformer has a primary voltage of 480 volts...Ch. 4 - If the secondary of the transformer in question 5...Ch. 4 - Explain the difference between a step-up and a...Ch. 4 - A transformer has a primary voltage of 240 volts...Ch. 4 - A transformer has an output of 750 VA. The primary...Ch. 4 - A transformer has a turns ratio of 1:6. The...
Ch. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - The primary leads of a transformer are labeled 1...Ch. 4 - The local utility company must provide service to...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Refer to Figure 4-79 to answer the following...Ch. 4 - Prob. 7PCh. 4 - Prob. 8P
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