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Q. A 230-Vdc shuntmotor delivers 30 hp at the shaft at 1120 r/min. If the motor has an efficiency of 87% at this load, find: (a) The total input power. (b) The line current.
20 cells with emf 1.45V and internal resistance 0.5Ω for each cells is linked 4 rows which every rows having of 5 cells in series. Load resistance 15Ω is connected to the battery.
digital voltmeter working principle
Transistor as a switch: Transistors are generally employed as electronic switches, for both of the high power applications including switched-mode power supplies and low power
Comparison of Induction and Dielectric Heating After studying the induction and dielectric heating followings points may consider for comparison between induction an
Q. Illustrate Power Semiconductor Devices? Since the advent of the first thyristor or silicon-controlled rectifier (SCR) in 1957, tremendous advances have been made in power se
A 3 phase 60 hertz induction motor has 8 poles and operates with a slip of .05 for a certain load. Compute in r.p.m. the (a)speed of the rotor with respect to the stator, (b)spe
A three-phase, wye-connected, four-pole, 400- V, 60-Hz, 15-hp synchronous motor has a synchronous reactance of 3 per phase and negligible armature resistance. The data for its no
Q. Explain Cellular Telephone Systems? Today radio-based systems make it possible for mobile people to communicate via cellular telephone systems while traveling on airplanes a
Q. The N-coil windings of a three-phase, two-pole machine are supplied with currents ia,ib, and ic, which producemmfs given by F a = Ni a cos θm; F b = Ni b cos(θm - 120°); and
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