EBK PRINCIPLES OF ELECTRIC CIRCUITS
10th Edition
ISBN: 9780134880068
Author: Buchla
Publisher: VST
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Students have asked these similar questions
A balanced three-phase, A - connected induction motor consumes 3246 W when the l
voltage is 208 V, and the line current is 10.6 A. Calculate:
i. The motor's winding resistance.
ii.
The motor's winding reactance.
12 m
a) An iron ring, having a mean circumference of 250 mm and a cross-sectional area of 400
mm², is wound with a coil of 70 turns. Using the following data, calculate the current
required to set up a flux of 510µWb in the ring.
H (A/m) 350
600
1250
B (T)
1.0
1.2
1.4
b) Calculate also:
i. The inductance of the coil at the current obtained in Question 2 (a) above.
ii. The self-induced e.m.f. if this current is switched off in 0.005 s. Assume that there
is no residual flux.
A balanced three-phase, 1351-V, 60-Hz, A-connected source feeds a balanced Y-
connected load with a per-phase impedance of 360 + j150 Q as shown in Figure 1.
Calculate:
i. The readings on each of the wattmeters
ii. The power factor of the load using the wattmeter readings.
NOTE:
i.
ii.
Let VAN be the reference phasor, and the phase sequence be ABC
anticlockwise.
Assume the voltage-drop on the conductors between the source and the load
to be zero volts.
V b
V₁
W
000
000 ;
A
360 + j150
360 + j150
4
b
0000
000
B
360 + j150
C
W₂
Figure 1
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- A three-phase load consists of three identical impedances connected in delta. The impedances have a value of (100 + j40) Q. The supply voltage is 440 V. The two- wattmeter method is used to determine the total power drawn by the load. One wattmeter, W₁, has its current coil connected in the blue line and its voltage coil connected between the yellow and blue lines. Calculate: a) The power measured by each wattmeter b) The power factor of the load using the wattmeter readings c) The apparent power supplied to the load d) The reactive power drawn by the load.arrow_forward4- 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° Armaturearrow_forwarda) 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.arrow_forward
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