- A 208 V, 50 Hz six pole, Y-connected, 27 hp design class B induction motor is tested in the laboratory, with the following results: No load: 208 V, 22.0 A, 1200 W, 50 Hz Locked rotor: 24.6 V, 64.5 A, 2200 W, 15 Hz DC test: 13.5 V, 64 A Find the equivalent circuit of this motor, and plot its torque-speed characteristic

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk