Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 10, Problem 2SQ
What type of pressure switch is generally used to sense small changes in low- pressure systems?
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can you show me full workings for this problem. the solution is -
v0 = 10i2 = 2.941 volts, i0 = i1 – i2 = (5/3)i2 = 490.2mA.
Q4.
a)
Consider a transmission line modelled as a four-terminal network with an
unknown configuration. You are provided with the following measured
parameters at the operating frequency:
Open-circuit voltage ratio: 0.9521°
• Short-circuit impedance: 40+j80
• Open-circuit admittance: -j2 × 10-4 S
Use the four terminal equations and the provided measurements to
mathematically derive the A, B, C, and D parameters of the network and
explain their physical significance. Show your work and formulas used in
the derivation.
Q1.
Consider a single-phase step-down transformer with primary and
secondary turns of 600 and 100 respectively and a primary voltage of
11 kV.
(i) An open circuit test was conducted on the transformer and the primary
current was measured as:
I₁ = 2.20 A
Use these results to calculate the magnetising reactance in the equivalent
circuit (X) given that Rm, representing the core loss, has a value of 21 km.
(ii) The remaining equivalent circuit parameters are as follows:
R₁ = 40, X₁ = 25 N, R₂ = 0.4 N, X₂ = 0.3 N
Draw the complete simplified equivalent circuit, by referring series
components on the primary side to the secondary, giving all component
values.
(iii) The transformer is connected, on its secondary side, to a load of 10
at a power factor of 1. Calculate the voltage across the load.
(iv) Calculate the efficiency of the transformer when operating at the load
given in part (iii).
Chapter 10 Solutions
Electric Motor Control
Ch. 10 - Describe how pressure switches are connected to...Ch. 10 - What type of pressure switch is generally used to...Ch. 10 - A pressure switch is set to cut in at a pressure...Ch. 10 - A pressure switch is to be installed on a system...Ch. 10 - A pressure switch is to be installed in a circuit...Ch. 10 - Refer to the circuit shown in Figure 105. If the...Ch. 10 - Refer to the circuit shown in Figure 105. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to Figure 106. When the thermostat contact...
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