Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Chapter 36, Problem 7RQ
To determine
The type of relay which is used to disconnect the start winding and also to double as an overload protector.
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Temperature
EXAMPLE 1: A diesel engine is fitted with a turbocharger,
which comprises a radial compressor driven by a radial
exhaust gas turbine. The air is drawn into the compressor at
a pressure of 0.95 bar and at a temperature of 15°C, and
is delivered to the engine at a pressure of 2.0 bar. The
engine is operating on a gravimetric air/fuel ratio of 18: 1,
and the exhaust leaves the engine at a temperature of
600°C and at a pressure of 1.8 bar; the turbine exhausts at
1.05 bar. The isentropic efficiencies of the compressor and T(K)
turbine are 70 per cent and 80 per cent, respectively.
Calculate (i) the temperature of the air leaving the
compressor (ii) the temperature of the gases leaving the
turbine (iii) the mechanical power loss in the turbocharger
expressed as a percentage of the power generated in the
turbine. Using the values of : Cpair = 1.01 kJ/kg K, Vair = 1.4
Cpex = 1.15 kJ/kg K, Yex = 1.33
and
2s
с
P2
Engine
P3
W
W₁ = mexpex (T3-TA)
At
W₁ = mair Cpex
(T2-T₁)
4
P4…
Problem 8.28
Part A
10 of 10
■Review
The uniform crate resting on the dolly has a mass of 530 kg and
mass center at G as shown in (Figure 1).
If the front casters contact a high step, and the coefficient of static friction between the crate and the dolly is μs = 0.45, determine the greatest force P that can be
applied without causing motion of the crate. The dolly does not move.
Express your answer to three significant figures and include the appropriate units.
Figure
-0.5 m-
0.6 m
0.3 m
0.1 m
B
0.4 m 0.3 m
>
☐
P = 1210
Submit
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Q1:
For the system shown in Fig. 6.7, the following data are applicable
P1 = 7 bar
Q=0.002 m3/sec
Pipe: total length 15m and ID 38mm
Oil: SG-0.90 and kinematic viscosity (v-0.0001 m2/s)
Solve for P2 in units of bars.
Motor
OH
Pump
Breather
P1
Pipe length = 3m
90' elbow
☐
38 mm (ID)
Pipe length = 2m
P2
Load force
Pipe length 4 m
=
Pipe length=6m
90' elbow
Chapter 36 Solutions
Industrial Motor Control
Ch. 36 - List five common starting methods for three-phase...Ch. 36 - Prob. 2RQCh. 36 - A squirrel-cage motor produces 1100 pound-feet of...Ch. 36 - What is the most common device used to disconnect...Ch. 36 - Prob. 5RQCh. 36 - Prob. 6RQCh. 36 - Prob. 7RQCh. 36 - Prob. 8RQCh. 36 - Prob. 9RQCh. 36 - Prob. 10RQ
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