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A 60 Hz, three-phase. 6 – pole, Y-connected induction motor produces 100 hp at 1150 rpm. The
friction and windage losses of the motor are 1.2 kW, the stator copper and core losses are 2.1.kW
Compute the input power and the efficiency of the motor.
A 0.5 hp, 6-pole induction motor is excited by a 3 –phase, 60 Hz source. If the full-load speed is
1140 rpm, calculate the slip.
A cell of emf 3v an internal resistance 0.5ohms passes current through an external resistor of 7o.calculate the potential drop across the cell
instantaneous velocity for a displacement function d(t)= 2-2t at any time is given by
The current in a conductor varies as follows : during the first 8 secs there is a linear change from zero to 4 amp; during the next 15 sec the current is constant at 4 amp, during the third period of 20 secs the current decreases linearly to 3 amp. Determine (a) the total charge transferred in the elapsed time of 43 secs, (b) the average current.
