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A 7.5 HP 230 volt three phase motor takes a line current of 18.4 A when operating at
rated output at an efficiency of 88%. Calculate the indications on wattmeters when
these are inserted to measure power (a) by two wattmeter method, (b) by the artificial
neutral method and (c) by the T method.
When a voltage of 100 volts at 50 Hz is applied to a series connection of a resistor A
and an inductor A, the current taken is 8 A and the power is 120 watts. When applied
to another series connection of a resistor B and an inductor B, the current is 10 A and
the power is 500 watts. What current and power will be taken when 100 V is applied
to the two coils in series?
A coil is wound with 300 turns over a stee ring of relative permeability 900 having a mean circumference of 400 mm and a cross-sectional area of 500 mm2 . If the coil has a resistance of 8Ω and is connected across a 20V dc supply, using a neat sketch, calculate:
a).The coil magneto-motive force
b).The magnetic field strength
c).The total flux
d).The reluctance of the ring
e).The permeance of the ring and
f).The flux density in the ring
A coil is wound with 300 turns over a stee ring of relative permeability 900 having a mean circumference of 400 mm and a cross-sectional area of 500 mm2 . If the coil has a resistance of 8Ω and is connected across a 20V dc supply, using a neat sketch, calculate:
a).The coil magneto-motive force
b).The magnetic field strength
c).The total flux
d).The reluctance of the ring
e).The permeance of the ring and
f).The flux density in the ring
Develop a double layer winding diagram having: S=48, P= 8 and m=3
Develop a double layer winding diagram having: S=48, P= 8 and m=3
4. Develop a double layer winding diagram having: S=48, P= 8 and m=3
Luke Autbeloe drops a pile of roof shingles from the top of a roof located 8.52 meters above the ground. Determine the time required for the shingles to reach the ground.
Draw the phasor diagram and find the sum of the currents i1=141.42sin(wt+90),i2=-70 71ciswt,i3=50e^j60,i4=100(-120),i5=50(cos60+jsin60)
A parallel plate capacitor has an area of 5.00 cm 2 and a capacitance of 3.50 pF. The capacitor is connected to a 12.0 V battery. After the capacitor is completely charged up, the battery is removed.
a) If the sheet of Mica has an area of 3.00 cm 2 so that it does not cover the whole area of the plates, what would be the effective capacitance of this arrangement?
b) If the Mica sheet is removed and the plates are moved 1.00 mm farther from each other, what will be the voltage between the plates, and how much work will it take to move the plates apart?
