MATERIALS SCIENCE AND ENGINEERING -PACK
10th Edition
ISBN: 9781119721857
Author: Callister
Publisher: WILEY
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Chapter 4, Problem 9QAP
To determine
The radius of the impurity atom that will just fit into a BCC tetrahedral site in terms of the atomic radius of the host atom.
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4- A 75 KW, 250 V shunt generator has R₁ = 0.03 2 and RF =50 2. The generator has 6 poles and is lap wound with totally 400
conductors. The generator runs at 600 rpm on full load. The bore of the machine is 42 cm (in diameter), its axial length is 28 cm
and each pole subtends an angle of 54 °.
Field
pole
a)
b)
c)
Find the airgap flux density. (10 pt)
Find the induced voltage under full load. (10 pt)
Find the average number of active conductors. (5 pts)
28 cm
21 cm
60°
Armature
a) The phase currents in a delta - connected three-phase load are as follows: between the
red and yellow lines, 60 A at p.f. 0.9 leading; between the yellow and blue lines, 40 A at
0.95 p.f lagging; between the blue and red lines, 50 A at p.f. 0.8 lagging. The supply
voltage is 240 V. Draw a labeled diagram of the circuit and calculate the line currents.
Note: Use VRY as the reference phasor.
b) The two-wattmeter method is used to measure the total power drawn by the load in 1 (a)
above. Wattmeter one has its current coil connected in the yellow line and its voltage coil
connected between the yellow and red lines. Calculate:
i. The power measured by each wattmeter.
ii. The power factor of the load.
QUESTION NO. 1
a) State Lenz Law
b) Explain Flux density
c) A wire, 100 mm long, is moved at a uniform speed of 4 m/s at right angles to its
length and to a uniform magnetic field. Calculate the density of the field if the e.m.f.
generated in the wire is 0.15 V. If the wire forms part of a closed circuit having a
total resistance of 0.04 2, calculate the force on the wire in newtons.
Chapter 4 Solutions
MATERIALS SCIENCE AND ENGINEERING -PACK
Ch. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAPCh. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAP
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