Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 48, Problem 7SQ
What happens if the reverse push button is closed when the motor is running in the forward direction as in Figure 48–5?
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1.51. Determine whether or not each of the following signals is periodic. If a signal is periodic,
determine its fundamental period.
(a) x(t)= cos 21+
cos(21
TT
me
// (d)_x(t) = ejπt
n
TT N
(g) x[n] = cos
COS
Ans. (a) Periodic, period = πT
(g) Nonperiodic
(d) Periodic, period = 2
Q1) [60p] Given the following message and carrier signal
m(t) = cos 2000nt + 2cos 6000лt + cos 10000πt
c(t) = 20 cos 320000πt
The signal is passed through following nonlinear device and a subsequent filter to generate
DSB-AM signal. The nonlinear device has the input-output relation y(t) = x²(t) + 10x(t).
y(t)
u(t)
m(t).
Non-Linear
Device
Filter
c(t)
a) Determine y(t).
b) Determine type of filter (BPF, HPF, LPF) and the bandwidth to obtain a DSB-AM
signal (Conventional AM)
c) What is the modulation index?
d) Determine power of m(t), u(t), and the ratio of power in side bands to carrier.
e) Assume that modulation signal u(t) is going to be demodulated by an envelope
detector. The resistor is selected as R = 1 K. What is the minimum and maximum
value of capacitor for a good detector.
Q2) [40p] Given the following message and carrier signal
m(t) = cos 2000πt + 2cos 6000πt + cos 10000πt
c(t) 20 cos 320000лt
a) Determine the Hilbert transform of m(t).
b) Determine the Single Side Band (SSB)…
Thermal power station of 5MW
• has plant capacity factor of 0.7;
Calorife Value of fuel is 8500 kcal
"The efficiens of station is 40%;
kg
Find The Total Fuel Consumption
in Tons unit for 12 days.
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Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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