Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 26, Problem 6SQ
To determine
Explain how the starter provides smooth acceleration and a gradual increase of torque.
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Choose the correct answer to the following questions:
1- What is the total power radiated in Watts for the power density W =
a) 4π²
b) 8m²/3
2- Fresnel zone is also called as
sine
W/m²?
3r²
c) 4π²/3
d) 2π²/3
a) Near Field b) Far Field
c) Electrostatic Field
d) Reactive Field
3- The far-field distance at 900 MHz, if the maximum antenna dimension is 0.75 m is....
a) 3.375 m
b) 3.5m
c) 3.375 cm
d) none
4- The antenna gain is
on input power to antenna and
on power due to ohmic losses.
c) Independent, dependent d)
a) Independent, independent b) Dependent, independent
Dependent, dependent
5- If beam width of the antenna increases, then directivity.
a) Decreases b) Increases c) Remains unchanged d) Depends on type of antenna
please solve this and clarify each step. thanks
The input reactance of 1/2 dipole with radius of 1/30 is given as shown in figure below,
Assuming the wire of dipole is conductor 5.6*107
S/m, determine at f=1 GHz the
a- Loss resistance, b- Radiation efficiency
c- Reflection efficiency when the antenna is
connected to T.L shown in the figure.
Rr
Ro= 50 2
Avg/4
RL
-j100
[In(l/a) 1.5]
tan(ẞ1)
Chapter 26 Solutions
Electric Motor Control
Ch. 26 - What is the purpose of inserting resistance in the...Ch. 26 - Why is the power not interrupted when the motor...Ch. 26 - If the starter is to function properly and a...Ch. 26 - How may additional steps of acceleration be added?Ch. 26 - What is meant by the low or poor starting economy...Ch. 26 - Prob. 6SQ
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