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home / study / engineering / mechanical engineering / classical mechanics / classical mechanics solutions manuals / automotive technology: a systems approach / 6th edition / chapter 21 / problem 1
Automotive Technology: A Systems Approach
(6th Edition)
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Which of the following uses a permanent magnet and two electromagnets?
a. Air-core gauge
b. Balancing coil gauge
c. Quartz analog gauge
d. D’ Arsonval gauge
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Step-by-step solution
Step 1 of 5
Balancing coil gauge operates on the principle of magnetism. However permanent magnet is not
used. The bottom of the indicative of upper limb is pivoted on an armature. Two or three coils are
located on each side of armature. Hence from this discussion we conclude that the balancing coil
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gauge does not uses permanent magnet with two electromagnets. Hence option (b) is NOT
CORRECT choice of answer
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Step 2 of 5
My Textbook Solutions
D’Arsonval gages be the magnetic gages. The ohm meters, ammeter, voltmeters are called as
D’Arsonval gauges. These gauges use electromagnet core and single permanent magnet. When
current flows all the way through the armature a magnetic field is produced. This magnetic field
opposes the stable magnet. An attractive or repulsive force is the reason to needle sway left to
right. As this gauge has permanent magnet but single electromagnetic core. Hence (d) NOT
CORRECT choice of answer.
Automotive
Electronic
Discrete
Technology:... Devices and... Mathemati
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6th Edition
Step 3 of 5
Air core gauge design relies on interaction of two electromagnets and result of the strength of the
field of the permanent magnets. Hence this gauge uses two electromagnets and permanent
magnets. Air core gauge is the correct answer. Hence the CORRECT choice of answer is (a).
Comment
Step 4 of 5
11th Edition
1st Edition
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analog gauge
is the
computerMy
controlled
analog gauge.
These gauges
operateLife
as air core
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gauge. But not controlled as per air core gauge. For its procedure stepper motor is used. This
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has two electromagnets and single permanent magnet. Hence CORRECT choice of answer is
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Chapter
21, Problem 12RQ
(c).
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Comment
Step 5 of 5
Form above discussion it is concluded that the Air core gauge, Quartz analog gauge have
permanent magnet and two electromagnets. Balancing coil gauge has no permanent magnet
hence not correct choice but D’Arsonval gauge has also permanent magnet but single
electromagnetic core. Hence CORRECT choice of answer is (a) and (c).
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