Given that
F=60 Hz
P= 8
N = ?
WE HAVE N= (120*F)/P
N = (120*60)/8
N = 900 RPM
HENCE, MECHANICAL SPEED = 900 RPM
4. What would be the steady-state mechanical speed in revolutions per minute (RPM) for an 8-...
1. An eight pole synchronous generator used in a WECS is connected to power grid having 50 Hz frequency. What would be the rotational speed of the rotor? If this machine is connected to US grid what would be its rpm? What would be the rpm of two pole and four pole machine for US grid? (Points 5+5+5+5 20)
A DVD has a maximum speed of 7200 revolutions per minute(rpm). If a DVD diameter is 12cm, what is the linear speed in km/h of a point form the disc's center if it is spinning at 5400 rpm?
A three-phase 4 pole wye connected 220 V, 15 Hp, 50 Hz induction machine (rated conditions) has the following parameters per phase refereed to the stator. RI : 0.29 Ω , R2 0. 14 Ω , Xi-0.50 Ω , X2-0.20 Ω , Xm-1 0.53 Ω The total windage and core losses can be assumed to be a constant 350 W. If the machine is operating at rated voltage and frequency with a 5.5% slip, find the steady-state: (a) 10pts. Mechanical...
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An electric motor of mass 100Kg runs at 1000...
4-pole, 50-Hz synchronous generator has a rating of 200 MVA, 0.8 power factor lagging. The kinetic energy of the machine at synchronous speed is 1000 MJ. The machine is running steadily at synchronous speed and delivering 50 MW to a load at a power angle of 8 electrical degrees. The load is suddenly removed. Determine the acceleration of the rotor in rpm/S. If the acceleration computed for the generator is constant for a period of 8 cycles, determine the following...
A centrifuge in a medical laboratory rotates at an angular speed of 2650 rpm (revolutions per minute). When switched off, it rotates 59.5 times before coming to rest. Find the constant angular acceleration of the centrifuge. (Assume the initial direction of rotation is the positive direction. Indicate the direction with the sign of your answer.)
QUESTION 9 Dotermi ine the synchronous speed, in revimin, of a 4-pole synchronous motor operating from a 60-Hz supply Enter the one best answer (as a number without the units) from the following choices 450 rpm 600 rpm 720 rpm 900 rpm 1200 rpm 1800 rpm 3600rpm
What is the magnitude of the acceleration of a speck of clay on the edge of a potter's wheel turning at 41 rpm (revolutions per minute) if the wheel's diameter is 38 cm ?
A 12 KV, 60 MVA, unity PF, 60 Hz, 4-Pole ,Y connected synchronous generator has a reactance of 0.2 Ohms, and its armature resistance is ignorably small, its friction and windage losses are 1 MW and its core losses are 1.5 MW a) What is the mechanical speed of the prime mover in this machine? b) What is the internal voltage (EA) of this machine under rated conditions? c) What is the voltage regulation of this machine under rated conditions?...
Example 7.1 Whirlybirds Goal Convert an angular speed in revolutions per minute to radians per second. Problem The rotor on a helicopter turns at an angular speed of 3.40 x 102 revolutions per minute. Express the angular speed in radians per second. Strategy During one revolution, the rotor turns through an angle of 27 radians. Use this relationship as a conversion factor. Solution Apply the conversion factors 1 rev = 2r and 60 S = 1 min. = 3.40 x...