13) What is the typical efficiency of an AC motor? The electric element on a stove? 13) What is the typical efficiency of an AC motor? The electric element on a stove?
An ac electric motor drives a dc electric voltage generator. If the motor operates a an efficiency of 90% and the generator at an efficiency of 80%, and if the input power to the motor is 5 kW, what is the output power of the generator?
The efficiency of the motor of an electric vehicle is 80% both in motor and generator mode. At velocities up to 50km/h the friction force of 500 N has to be overcome. The mass of the vehicle equals one ton. The velocity diagram below describes the motion pattern of the vehicle on a rectilinear path. Calculate the energy recovered during braking phase an the net energy consumed. v in km/h 50+ 3/5 tins 600 615
III. A 3.5 in3 hydraulic motor has a mechanical efficiency of 0.61 and a volumetric efficiency of 0.73. It produces 650 lb in of torque at 1220 rpm. System flow is provided by a piston pump that has a theoretical flow rate of 42 gpm and a mechanical efficiency of 0.71. The pump is driven by horsepower and kilowatts required to operate the system. What is the overall efficiency of the system? an electric motor with a 0.71 efficiency. Find...
(11%) Problem 2: The winding of an AC electric motor has an inductance of 29 mH and a resistance of 19 2. The motor runs on a 60-Hz rms voltage of 120 V. 33% Part (a) What is the rms current that the motor draws, in amperes? Ims = 5.61 ✓ Correct! * 33% Part (b) By what angle, in degrees, does the current lag the input voltage? 33% Part (c) What is the capacitance, in microfarads, of the capacitor...
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,200. A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 92%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period. a. Which motor should be chosen? b. For...
If an AC induction motor says in nameplate that the power is 100 HP, and it has an efficiency of 88%. It is operating at a 90% of full load. What is the input kW to the motor?
A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2.200 A second 30-horsepower high-efficiency motor can be purchased for $3,200, and its efficiency is 93%. Either motor will be operated 4,000 hours per year at full load, and electricity costs $0.10 per kilowatt-hour (kWh). MARR= 15% per year, and neither motor will have a market value at the end of the eight-year study period. Most motors are operated at a fraction of their...
Problem 6-16 (algorithmic) Question Help A special-purpose 30-horsepower electric motor has an efficiency of 90%. Its purchase and installation price is $2,100. A second 30-horsepower high-efficiency motor can be purchased for $3,100, and its efficiency is 94%. Either motor will be operated 3,500 hours per year at full load, and electricity costs $0.09 per kilowatt-hour (kWh). MARR = 12% per year, and neither motor will have a market value at the end of the eight-year study period a. Which motor...
Question 13 5 pts An electric motor delivers 67-HP mechanical power when its shaft turns at 2,832 RPM. What is the shaft torque in N.m? 1 HP = 746 W. Question 14 5 pts Copy of A DC motor supplied from 48 V draws 5 amps and turns at 157 rad/sec when the load torque is 1.45 N.m. What is the efficiency in percent?
A typical electric water heater has a heating element rated at 4500 Watts and is connected across a 240 Volt power source. When operated normally, find the resistance of the heating element, the current drawn by the heating element, and the cost of heating water for 45.0 minutes. Assume electricity costs $.10/kw * hr