ENGINEERING CIRCUIT...(LL)>CUSTOM PKG.<
9th Edition
ISBN: 9781260540666
Author: Hayt
Publisher: MCG CUSTOM
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Question
Chapter 3, Problem 15E
To determine
Draw the circuit for a four walled room which has a single electrical outlet per wall, with a lamp (represented by a
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1- The stator core of a 3- phase induction motor is laminated in order to reduce the
Eddy current loss
) Weight of the stator
(B) Hysteresis loss (C) Both eddy current and hysteresis loss
- In cumulatively cascade method for speed controlling of a 3-phase induction motor, if PA is the
number of poles of main motor and P, is the number of poles of auxiliary motor. Then the speed of the
motor B is given by
Ⓐ120f/ PA + PB
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(B) 120f/PA-Ps
(C) 120f/PA (D) 120f/ Ps
3-Direct online starter is used for 3- phase induction motors having capacity
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⑭Ⓐ Less than 5 h.p. (B) Less than 10 h.p. (C) Greater than 10 h.p. (D) For any capacity motor
4-Crawling of a 3- phase induction motor is a phenomena mainly associated with
(B) 5th harmonics Ⓒ) 7 th harmonics (D) 2nd harmonics
(A) 3rd harmonics
5-Cogging in a 3- phase induction motor is caused ---------
(Ⓐ) If the number of stator slots are equal to number of rotor slots
(B) If the motor is running at fraction of its…
Choose the correct answer:
1-We avoid line starting of induction motor and use starter because...
(A) It will run in reverse direction (B) It will pick up very high speed and may go out of step
Motor takes five to seven times its full load current (D) Starting torque is very high
2-DOL starting of induction motors is usually restricted to...........
A Low horsepower motors
(D) High speed motors
(B) Variable speed motors (C) High horsepower motors
3- The method which can be used for the speed control of induction motor from stator side is.........
(A) V/f control
(B) Controlling number of stator poles to control Ns
(C) Adding rheostats in stator circuit
All of these
4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor
and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by
120f/PA + PB (B) 120f/PA-PB
(C) 120f/PA
5-The crawling in the induction motor is caused by..............
(A) low voltage supply (B)…
For the picture attached below the parameters are the following:
f1 = 400 Hz
m(t) = sin(2 fmt), where fm = 300 Hz.
Assume ideal LPFs with a cut-o frequency of f1.
What would be the value of frequency f2 be so that the carrier frequency is 2.5kHz?
What modification of this system is required to generate USSB (at the same carrier frequency)? ( Note: this does not involbe changing the oscillator frequencies)
Chapter 3 Solutions
ENGINEERING CIRCUIT...(LL)>CUSTOM PKG.<
Ch. 3.2 - 3.1 (a) Count the number of branches and nodes in...Ch. 3.3 - Determine ix and vx in the circuit of Fig. 3.7....Ch. 3.3 - For the circuit of Fig. 3.9, if vR1=1V, determine...Ch. 3.3 - Determine vx in the circuit of Fig. 3.11.Ch. 3.4 - In the circuit of Fig. 3.12b, vs1 = 120 V, vs2 =...Ch. 3.4 - 3.6 In the circuit of Fig. 3.14, find the power...Ch. 3.5 - Determine v in the circuit of Fig. 3.16.Ch. 3.5 - For the single-node-pair circuit of Fig. 3.18,...Ch. 3.6 - Determine the current i in the circuit of Fig....Ch. 3.6 - Determine the voltage v in the circuit of Fig....
Ch. 3.6 - Determine whether the circuit of Fig. 3.25...Ch. 3.7 - 3.12 Determine a single-value equivalent...Ch. 3.7 - 3.13 Determine i in the circuit of Fig. 3.29....Ch. 3.7 - Determine v in the circuit of Fig. 3.31 by first...Ch. 3.7 - 3.15 For the circuit of Fig. 3.33, calculate the...Ch. 3.8 - 3.16 Use voltage division to determine vx in the...Ch. 3.8 - In the circuit of Fig. 3.40, use resistance...Ch. 3 - Referring to the circuit depicted in Fig. 3.45,...Ch. 3 - Referring to the circuit depicted in Fig. 3.46,...Ch. 3 - For the circuit of Fig. 3.47: (a) Count the number...Ch. 3 - For the circuit of Fig. 3.47: (a) Count the number...Ch. 3 - Refer to the circuit of Fig. 3.48, and answer the...Ch. 3 - A local restaurant has a neon sign constructed...Ch. 3 - Referring to the single-node diagram of Fig. 3.50,...Ch. 3 - Determine the current labeled I in each of the...Ch. 3 - In the circuit shown in Fig. 3.52, the resistor...Ch. 3 - The circuit of Fig. 3.53 represents a system...Ch. 3 - In the circuit depicted in Fig. 3.54, ix is...Ch. 3 - For the circuit of Fig. 3.55 (which employs a...Ch. 3 - Determine the current labeled I3 in the circuit of...Ch. 3 - Study the circuit depicted in Fig. 3.57, and...Ch. 3 - Prob. 15ECh. 3 - For the circuit of Fig. 3.58: (a) Determine the...Ch. 3 - For each of the circuits in Fig. 3.59, determine...Ch. 3 - Use KVL to obtain a numerical value for the...Ch. 3 - Prob. 19ECh. 3 - In the circuit of Fig. 3.55, calculate the voltage...Ch. 3 - Determine the value of vx as labeled in the...Ch. 3 - Consider the simple circuit shown in Fig. 3.63....Ch. 3 - (a) Determine a numerical value for each current...Ch. 3 - The circuit shown in Fig. 3.65 includes a device...Ch. 3 - The circuit of Fig. 3.12b is constructed with the...Ch. 3 - Obtain a numerical value for the power absorbed by...Ch. 3 - Compute the power absorbed by each element of the...Ch. 3 - Compute the power absorbed by each element in the...Ch. 3 - Kirchhoffs laws apply whether or not Ohms law...Ch. 3 - Referring to the circuit of Fig. 3.70, (a)...Ch. 3 - Determine a value for the voltage v as labeled in...Ch. 3 - Referring to the circuit depicted in Fig. 3.72,...Ch. 3 - Determine the voltage v as labeled in Fig. 3.73,...Ch. 3 - Although drawn so that it may not appear obvious...Ch. 3 - Determine the numerical value for veq in Fig....Ch. 3 - Determine the numerical value for ieq in Fig....Ch. 3 - For the circuit presented in Fig. 3.76. determine...Ch. 3 - Determine the value of v1 required to obtain a...Ch. 3 - (a) For the circuit of Fig. 3.78, determine the...Ch. 3 - What value of IS in the circuit of Fig. 3.79 will...Ch. 3 - (a) Determine the values for IX and VY in the...Ch. 3 - Determine the equivalent resistance of each of the...Ch. 3 - For each network depicted in Fig. 3.82, determine...Ch. 3 - (a) Simplify the circuit of Fig. 3.83 as much as...Ch. 3 - (a) Simplify the circuit of Fig. 3.84, using...Ch. 3 - Making appropriate use of resistor combination...Ch. 3 - Calculate the voltage labeled vx in the circuit of...Ch. 3 - Determine the power absorbed by the 15 resistor...Ch. 3 - Calculate the equivalent resistance Req of the...Ch. 3 - Show how to combine four 100 resistors to obtain...Ch. 3 - Prob. 51ECh. 3 - Prob. 52ECh. 3 - Prob. 53ECh. 3 - Prob. 54ECh. 3 - Prob. 55ECh. 3 - Prob. 56ECh. 3 - Prob. 57ECh. 3 - Prob. 58ECh. 3 - Prob. 59ECh. 3 - Prob. 60ECh. 3 - With regard to the circuit shown in Fig. 3.98,...Ch. 3 - Delete the leftmost 10 resistor in the circuit of...Ch. 3 - Consider the seven-element circuit depicted in...
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