The power input to a 3-phase induction motor is 60 kW. Total stator losses are 1000 W, the % efficiency of the motor if it is running at a slip of 4% is. (Assume negligible mechanical losses) 35 X

List 3 differences between how 3 phase induction motors and single phase induction motors work.

How do we increase or decrease the generated voltage output in the operation of a factory finished Alternator?

A 240 V, 50 Hz, single-phase capacitor start a.c. motor is loaded such that the ship is 6% The motor constants referred to the stator are: Stator resistance = 2-22; Rotor resistance = 3-852 Stator reactance = 3.0; Rotor reactance = 2-12 Magnetising reactance = 862; Iron and friction loss = 50 W Draw the equivalent circuit and from it find the output power and efficiency at the given loading.

A 460 V, 25 hp, 60 Hz, wye-connected, four-pole induction motor has the following impedances in ohms per phase referred to the stator circuit: R1=0.641W, R2=0.332W, X1-1.106W, X2=0.464W, Xm=26.3W The total rotational losses are 1100 W and are assumed to be constant. Core losses are grouped with rotational losses. For a rotor slip of 2.2% at rated voltage and frequency, find the following motor quantities: a) Speed, b) Stator current, c) Power factor, d) Pd and Pout. e) td and tload f) Efficiency

Fhe number of parallel paths and the number of series conductrs required for a given kW reting are determined by. System voltage Armature resistance Type of winding Field current

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Electrical Machines A 4-pole single-phase induction motor is rotating in a clockwise direction at a speed of 1000 rpm having a voltage of 100 V with a frequency of 50 Hz. At a standstill, if the rotor resistance is 1.70, then in the backward branch what will be the effective resistance?

The torque developed by a dc series motor is 12 N-m when drawing 23 A. If the current is doubled, the torque developed becomes N-m.

At rest condition, the slip of induction motor is 0. Select one: True False