An electric motor delivers 23 HP of mechanical power into a load. It runs on sin

Question

An electric motor delivers 23 HP of mechanical power into a load. It runs on single phase 440 VaC running current. Find a- running current. b- starting current. c- suitable circuit breaker value, justify your choice of value. d- phase angle between current and voltage in the motor. Since the motor is 85 percent efficient, where does the 15 percent of the input the power go? at room temperature a power transistor has a beta of 160 and it is used in a DC dimmer circuit to control a 24 volt 120 watt lamp. The lamp power supply is 48 volts DC maximum of 21 ampreres of current. a-sketch a diagram of the dimmer circuit. b- calculate lamp current at 100 percent brightness c- find base current of the transistor

Explanation / Answer

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