Number 9
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
Related questions
Question
Number 9
![2.
to
The only drawback of PM motors is the rela-
uvely high cost of the magnets and the inability to
obtain higher speeds by field weakening.
b. The m
A separat
1200 r/m
12
to a 115
voltage r
1500 r/m
Questions and Problems
Practical Level
The follo
13
Name three types of dc motors and make a
250 hp, 2
sketch of the connections.
nominal
Explain what is meant by the generator ef-
insulatio
fect in a motor.
weight: 3
What determines the magnitude and polarity
cdocu
Couzed
3.
of the counter-emf in a dc motor?
external
4.
The counter-emf of a motor is always ed
slightly less than the applied armature volt-
length of
a. Calcu
at full
b. Calcu
age. Explain.
5.
Name two methods that are used to vary the
speed of a dc motor.
exciti
9.
Explain why the armature current of a shunt
motor decreases as the motor accelerates.
20 pe
c. Calcu
resist
7 Why is a starting resistor needed to bring a
motor up to speed?
know
at ful
d. If we
8 Show one way to reverse the direction of ro-
tation of a compound motor.
what
A 230 V shunt motor has a nominal arma-
curre:
6.
ture current of 60 A. If the armature resist-
14
We wish
ance is 0.15 N, calculate the following:
a. The counter-emf [V]
b. The power supplied to the armature [W]
c. The mechanical power developed by the
motor, [kW] and [hp]
10 a. In Problem 9 calculate the initial starting
current if the motor is directly connected
across the 230 V line.
b. Calculate the value of the starting resistor
needed to limit the initial current to 115 A.
motor b"
shown in
current i
a. The v
want
curre
b. The b
O r/m
Intermediate level
15
a. The r
11 The compound motor of Fig. 12 has 1200
by us
turns on the shunt winding and 0](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F585e4a80-646c-4418-ada9-cb992a2ce44b%2F21485c18-2e58-428a-9c7f-97f04f1dbe03%2Frkl74gp.jpeg&w=3840&q=75)
Transcribed Image Text:2.
to
The only drawback of PM motors is the rela-
uvely high cost of the magnets and the inability to
obtain higher speeds by field weakening.
b. The m
A separat
1200 r/m
12
to a 115
voltage r
1500 r/m
Questions and Problems
Practical Level
The follo
13
Name three types of dc motors and make a
250 hp, 2
sketch of the connections.
nominal
Explain what is meant by the generator ef-
insulatio
fect in a motor.
weight: 3
What determines the magnitude and polarity
cdocu
Couzed
3.
of the counter-emf in a dc motor?
external
4.
The counter-emf of a motor is always ed
slightly less than the applied armature volt-
length of
a. Calcu
at full
b. Calcu
age. Explain.
5.
Name two methods that are used to vary the
speed of a dc motor.
exciti
9.
Explain why the armature current of a shunt
motor decreases as the motor accelerates.
20 pe
c. Calcu
resist
7 Why is a starting resistor needed to bring a
motor up to speed?
know
at ful
d. If we
8 Show one way to reverse the direction of ro-
tation of a compound motor.
what
A 230 V shunt motor has a nominal arma-
curre:
6.
ture current of 60 A. If the armature resist-
14
We wish
ance is 0.15 N, calculate the following:
a. The counter-emf [V]
b. The power supplied to the armature [W]
c. The mechanical power developed by the
motor, [kW] and [hp]
10 a. In Problem 9 calculate the initial starting
current if the motor is directly connected
across the 230 V line.
b. Calculate the value of the starting resistor
needed to limit the initial current to 115 A.
motor b"
shown in
current i
a. The v
want
curre
b. The b
O r/m
Intermediate level
15
a. The r
11 The compound motor of Fig. 12 has 1200
by us
turns on the shunt winding and 0
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