8-What is the efficiency of a motor with a resistance of 6 ohms and a zit emf of 12 V when operating with a current of 2 A? A) 50 B) 75 C) 25 D) 100 E) 10
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8-What is the efficiency of a motor with a resistance of 6 ohms and a zit emf of 12 V when operating with a current of 2 A?
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- You are working as an electrician in a large steel manufacturing plant, and you are in the process of doing preventive maintenance on a large DC generator. You have megged both the series and shunt field windings and found that each has over 10 M to ground. Your ohmmeter, however, indicates a resistance of 1.5 across terminals S1andS2. The ohmmeter indicates a resistance of 225 between terminals F1andF2. Are these readings normal for this type machine, or is there a likely problem? Explain your answer.You have been given the task of connecting a nine-lead three-phase dual-voltage motor to a 240-V line. You discover that the nameplate has been painted and you cannot see the connection diagram. To make the proper connections, you must know if the motor stator winding is connected wye or delta. How could you determine this using an ohmmeter? Explain your answer.A three-blade wind turbine has a speed of 140 rpm for a rated speed of 8 m/s, coefficient of power= 0.43, mechanical efficiency of 90% and electrical efficiency of 82%. Estimate the electrical output of a turbine having a blade length of 12 m. Take Air density= 1.226kg/m3.
- A Series motor a current of 25 A when the supply voltage is 230V. If the total resistance of the motor is 3 0 and the Iron, Friction, Windage losses are 250 W. Find the efficiency of the motor.Two 70 horsepower motors are being considered for use. If power costs $0.18 per kWh, and if the interest rate is 15%, how many hours of operation per year is required to justify the purchase of XYZ brand motor? (1 HP=0.746 kW) Which motor would you select if the motor is expected to operate 2500 hours per year?A 240 V dc motor on brake test took 52 Amp when running at 1500 rpm. The spring balance at the end of the 76 cm brake arm reads 93.5 N. What is the efficiency of the motor at this load. [Ans. 90 %] write solution neatly
- In a break test of an elevator door, the ammeter and voltmeter measuring the input read 34 A at 220 V. The speed of the motor is found to be 910 rpm and the 0.61m break arm reads 11.9kg. the dead weight of the arm is found to be 1.09kg. what is the hp output of the motor?An electric motor takes 82 A at 600 Volts and has an efficiency of 78 %. Determine (a) the horsepower which it delivers; (b) total electric energy consumed after a day of operation; (c) total costof energy when unit cost is 12.00 Php per kW-Hr.The fan is rated to deliver 600m3/min when running at 350rpm and required 7kw motor to drive it. If the fan speed is changed to 600rpm and the air handled at 55C instead of 28C, find the power in kw. a. 32.36kw b. 40.25kw c. 36.5kw d. 45kw
- Calculate the efficiency of the 2.2 kW axial smart motor. note: If there is a value you want to be known, you can give it yourself.A motor rated at 30 horsepower is actually developing 35 horsepower.What is the percent of horsepower overload? Round to the nearest tenth.16 - An electric motor with a resistance of 8ohm draws a current of 1A from a battery with an internal resistance of 3ohm and an emf of 15V. What is the zit emf of the motor in volts? A) 3 B) 1 C) 5 D) 2 E) 4
