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A 250V, 50Hz single-phase supply feeds the following loads
(i) incandescent lamps taking a current of 10A at unity power factor,
(ii) fluorescent lamps taking 8A at a power factor of 0.7 lagging,
(iii) a 3kVA motor operating at full load and at a power factor of 0.8 lagging and
(iv) a static capacitor
Determine, for the lamps and motor,
(a) the total current,
(b) the overall power factor and
(c) the total power.
(d) Find the value of the static capacitor to improve the overall power factor to 0.975 lagging.
Two thin convex lenses of focal lengths 0.15m and 0.2m are separated by a distance of 0.6m. Determine the effective focal length of the combination.
Specified a set of equipotential surfaces how does one determine the corresponding set of electric field lines? Feedback: An equipotential surface signifies a set of poin
Properties of laser: Lasers have applications in various disciplines of science and technology. They also find applications in industry, medicine and defence and space science
A flow rate of 200 gpm of oil with u=1.5 x 10 -3 lb-sec/ft2 and p=1.7 slug/ft3 occurs in a 4-in pipe. Determine the Reynolds number. Classify the flow as laminar or turbulent. Wha
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how to find resultant?
A silicon material is subjected to a magnetic field of strength 1000A/m. If the magnetic susceptibility of silicon is -0.3x10-5, calculate its magnetization and magnetic flux densi
It normally takes maria 10 minutes to travel 5.0 miles to UTPA along a straight road. Maria leaves home 15 minutes before class begins. Delays caused by a broken traffic light slow
What are capacitors used for in induction coils
The greatest induced EMF will occur in a straight wire moving at constant speed through a uniform magnetic field when the angle between the direction of the wire's motion and the d
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