INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780357670590
Author: Herman
Publisher: CENGAGE L
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Chapter 33, Problem 3RQ
Why are clapper-type contactors generally used to control DC devices?
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1.21 A one-dimensional plane wall is exposed to convective
and radiative conditions at x = 0. The ambient and sur-
rounding temperatures are T = 20°C and Tur = 40°C,
respectively. The convection heat transfer coefficient is
h=20 W/m² K, and the absorptivity of the exposed sur-
face is α=0.78. Determine the convective and radiative
heat fluxes to the wall at x = 0 if the wall surface tem-
perature is T, = 24°C. Assume the exposed wall surface
is gray, and the surroundings are large.
1.12 You've experienced convection cooling if you've ever
extended your hand out the window of a moving vehi-
cle or into a flowing water stream. With the surface of
your hand at a temperature of 30°C, determine the con-
vection heat flux for (a) a vehicle speed of 40 km/h in
air at -8°C with a convection coefficient of 40 W/m² K
and (b) a velocity of 0.2 m/s in a water stream at 10°C
with a convection coefficient of 900 W/m²K. Which
condition would feel colder? Contrast these results with
a heat flux of approximately 30 W/m² under normal
room conditions.
PLEASE SOLVE STEP BY STEP WITHOUT ARTIFICIAL INTELLIGENCE OR CHATGPT
SOLVE BY HAND STEP BY STEP
Chapter 33 Solutions
INDUSTRIAL MOTOR CONTROL
Ch. 33 - Prob. 1RQCh. 33 - Why is direct current more difficult to interrupt...Ch. 33 - Why are clapper-type contactors generally used to...Ch. 33 - Prob. 4RQCh. 33 - How is the inrush current to large DC motors often...Ch. 33 - Prob. 6RQCh. 33 - How is the FCR connected in relationship to the...Ch. 33 - Prob. 8RQCh. 33 - Prob. 9RQ
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