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Q. A 230-V, single-phase, 60-Hz source supplies two loads in parallel. One draws 10 kVA at a lagging power factor of 0.80 and the other draws 6 kWat a lagging power factor of 0.90. Compute the source current.
Q. A 300-kVA transformer has a core loss of 1.5 kW and a full-load copper loss of 4.5 kW. (a) Calculate its efficiency corresponding to 25, 50, 75, 100, and 125% loads at unity
One battery having of four cells, connected in series. Emf of each cell is 1.45V and internal resistance of 0.04Ω. if a load resistance of 5Ω is connected to the battery, draw the
Particles of mass M and m separated in space by a distance R exert a mutually attractive gravitational force F on one another given by where G is the universal gravitationa
Explain the discovery of neutron. Mention its properties. Discovery of Neutron: The existence of neutron was first predicted by Rutherford in the year 1920. But it was discov
Responses to Exponential Excitations Let us consider Aest as a typical exponential excitation in which A is a constant and s is a complex- frequency variablewith a dimension of
There is a limitation on the size of data. Most Microprocessor does not maintain floating-point operations.
Explain ferroelectricity. Ferroelectricity: - Materials of ferroelectric have a high dielectric constant that is non-linear that is, this depends to a considerable extent on t
The field resistance of a dc machine is 50 ohm at 20 o C. The resistance increases to 55 ohm at 50 o C. Find the temperature coefficient of the resistance material. Ans: Sol
When I read the details of how a transformer works and apply those rules to a transformer where the primary core cross-sectional area is twice that of the secondary, I come up with
Q. A satellite radio transmitter has P in = 3 W and G t = 30 dB. The receiving antenna has a circular aperture with radius r at the ground station 30,000 km away. Find r in meter
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