Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781337264419
Author: Stephen L. Herman
Publisher: Cengage Learning US
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Question
Chapter 20, Problem 1RQ
To determine
The indication shown by TENV on the nameplate of the motor.
Expert Solution & Answer
Explanation of Solution
The National Electrical Manufacturers Association defines some basic parameters regarding the design and dimensions in order to define the basic performance and mounting parameters.
These parameters are coded on the motor nameplate in order to define the key features of the motor. The information which is inscribed on the motor nameplate is arranged by categories.
TEMV stands for totally enclosed non ventilated type motor which indicates that the motor is sealed in such a way that it is totally safe from dirt and humidity although hot environment is not favorable for these kind of motors.
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Students have asked these similar questions
13.38 Consider the attic of a home located in a hot climate.
The floor of the attic is characterized by a width of
L₁ = 8 m while the roof makes an angle of 0 = 30° from
the horizontal direction, as shown in the schematic.
The homeowner wishes to reduce the heat load to the
home by adhering bright aluminum foil (ε = 0.07) onto
the surfaces of the attic space. Prior to installation of
the foil, the surfaces are of emissivity & = 0.90.
Attic
A2, 82, T2 0 = 30°
A1, E1, T₁
土
L₁ = 8 m
(a) Consider installation on the bottom of the attic
roof only. Determine the ratio of the radiation heat
transfer after to before the installation of the foil.
(b) Determine the ratio of the radiation heat transfer
after to before installation if the foil is installed
only on the top of the attic floor.
(c) Determine the ratio of the radiation heat transfer if
the foil is installed on both the roof bottom and the
floor top.
13.1
Determine F2 and F2 for the following configura-
tions using the reciprocity theorem and other basic
shape factor relations. Do not use tables or charts.
(a) Small sphere of area A, under a concentric hemi-
sphere of area A₂ = 3A₁
A₂
A1
(a)
(b) Long duct. Also, what is F₁₂?
A₂
Αν
(b)
(c) Long inclined plates (point B is directly above the
center of A₁)
B
100 mm
A₂
- 220 mm
(c)
(d) Long cylinder lying on infinite plane
+
A₁
Az
(d)
(e) Hemisphere-disk arrangement
-A₂, hemisphere,
diameter D
A₂
A₁, disk,
diameter D/2
(e)
(f) Long, open channel
1 m
AA₂
2 m
(f)
(g) Long cylinders with A₁ = 4A₁. Also, what is F₁₂?
-D₁
A1
-A₂
-D2
(e)
(h) Long, square rod in a long cylinder. Also, what
is F22?
w=D/5
18
A₁
-A2
(h)
-D
13.9 Determine the shape factor, F12, for the rectangles
shown.
6 m
1
3 m
6 m
1 m
2
6 m
1
0.5 m
2
1 m
(a) Perpendicular rectangles
without a common edge.
-1 m.
(b) Parallel rectangles of
unequal areas.
Chapter 20 Solutions
Electrical Transformers and Rotating Machines
Ch. 20 - Prob. 1RQCh. 20 - Prob. 2RQCh. 20 - Prob. 3RQCh. 20 - A motor nameplate indicates an insulation...Ch. 20 - What is the most common NEMA design code found on...Ch. 20 - A motor develops 225 ft-lb of torque at 860 RPM....Ch. 20 - The nameplate of a motor lists the frame as 256T....Ch. 20 - A motor develops 189 ft-lb of torque at 1745 RPM....Ch. 20 - Prob. 9RQCh. 20 - A motor nameplate lists the voltage as...
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