2. An alternator operates at a speed of 176.5 rpm. How many poles does it have if the voltage is generated at 50 cycles? and also What is the rotor speed (rpm) of a 4-pair generator supplied at 40 hz?
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2. An alternator operates at a speed of 176.5 rpm. How many poles does it have if the voltage is generated at 50 cycles? and also What is the rotor speed (rpm) of a 4-pair generator supplied at 40 hz?
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- The 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. 2An alternator has a poles a) At what speed must the machine be driven to develop 60 cycles? 25cycles? What frequency is developed if the speed is 1,000 rpm?Shunt generator running at 1000 rpm, if flux is reduced by half, then what is the new speed 1000 r.p.m O 2000 r.p.m 500 r.p.m O Or.p.m
- The maximum speed of an alternator working at 60 Hz is possible when the number of poles of the machine is **.***LEE a. 2 b.4 C. 5 d. 3 The cerrecttanswer is 2A three-phase synchronous generator is rotating at 1000 RPM synchronous speed. The output power of this generator is 8.5 KW and its efficiency is 88%. If the copper losses are neglected. Calculate the induced torque by this generator. Select one: O a. Tind = 73.04 N.m. O b. tind = 8,48 N.m. O c. Tind = 81.1 N.m. O d. None O e. tind = 90.16 N.m. Clear my choice4. An a-c generator has six poles and operates at 1,200 rpm. (a) What frequency does it generate? (b) At what speed must the generator operate to develop 25 cycles? 50 cycles? (c) How many poles are there in a generator that operates at a speed of 240 rpm and develops a frequency of 60 cycles? () -I Cycle- (0) Two poles - one cycle per revolution. N N -2 Cycles (A Four poles-two cycles per revolution. AN LS ANA LEJ ANA LSJ -3 Cycles (c) Six poles -three cycles per revolution. Sketch illustrating the relation between the number of poles and the generated a-c frequency in cycles per revolution. Current Current Current
- An ideal dc generator has regulation of 40% 20% O 30% ZeroAn AC generator has a no-load voltage setpoint of 610 V and a full-load voltage of 595 V. What is the voltage droop of the machine?In a motor-generator set, calculate the number of poles required in the motor to convert AC 60 Hz input, to AC 50 Hz output. Given that the number of poles of the generator is given as 10 poles. Select one: O a. Pm = 18 poles O b. Pm = 12 poles O c. Pm = 8 poles O d. None O e. Pm = 10 poles Clear my choice
- A 4-pole dc generator with duplex lap winding has 48 slots and 4 elements per slot. The flux per pole is 2.5 x 106 maxwells and it runs at 1500 rpm. Find the output voltage.A DC generator with 8 pole, duplex lap winding excited with a flux of 3mWb/ pole. The number of parallel path in the winding is A 12 B 8 C 16 D 4Q- In a DC generator, what will be change in emf induced if flux is reduced by 20% and the speed is increased by 20%.