A 6-pole. 50-Hz 3-ϕ induction motor is running at 950 rpm and has rotor loss of 5 kW. Its rotor input is ...... kW a) 100 b) 10 c) 95 d) 5.3
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A 6-pole. 50-Hz 3-ϕ induction motor is running at 950 rpm and has rotor loss of 5 kW. Its rotor input is ...... kW
a) 100
b) 10
c) 95
d) 5.3
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- The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 is short-pitched by ........... degrees. 150 40. 90 20 Brushless excitation system consisting of: Stator field winding and power diodes stator and rotor field winding and capacitor stator and rotor field winding and power diodes Everything mentioned in the options Full Name : *8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 WThe maximum speed of an alternator working at 60 Hz is possible when the number of poles of the machine is ........ a. 4 b. 5 c. 3 d. 2
- 1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turnAn induction motor is rated 5 HP, 75% power factor and 220 V. What approximate size of capacitor (VAR) is necessary to raise the power factor to about 95%?P4. An 8 pole alternator runs at 750 rpm, and supplies power to a 6 pole, three-phase induction motor which runs at 970 rpm What is the slip of induction motor?
- The rotor of a 220 –V 60 Hz, 4-pole induction motor has a power input of 80kW is observed that the rotor emf makes 90 cycles per minute. Calculate the rotor copper loss. (a). 2kW (b). 5kW (c). 3kW (d). 4kWWhat is The efficiency of 3-ph induction motor. at (Is=4.5A, T=13 N.m, N=1333 rpm, Pph=864 watt ) ?the field windings of a series motor has a resistance of 120 ohms at 15° c. after running for 2 hours, the resistance has increases to 140 ohms. if the temperature coefficient of the windings at 0°C is 0.004, find the new temperature of the windings
- The speed of an induction motor fed from a 3-phase and 50 Hz source is 1440 rpm, so which of the following is the number of poles of the motor?a)2b)4C)6d)8f) 12A four-pole induction motor drives a load at 2575 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. ▾ Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit ▾ Part B Value μÀ Submit I= Value Provide Feedback ^ Request Answer If the dc-to-ac converter has a power efficiency of 85 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. 4 Ò Request Answer Units ? Units ?A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?