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An induction motor has a starting current that is 6 times the full-load current and a per-unit full- load slip of 0.04. The machine is to be provided with an autotransformer starter. If the minimum starting torque must be 0.3 times the full-load torque, determine the required tapping on the transformer and the per-unit supply-source line current at starting.
Q. List and explain the factors involved in the voltage build up of shunt generator. Ans. following factors are involved in voltage build up of shunt generation
Q. Determine the armature current and torque angle? A 1500-hp, 6600-V, six-pole, 60-Hz, three-phase, wye-connected, synchronous motor, with a synchronous reactance of 36 , neg
if load is removed so which motor will run fast? series or shunt?
CPI Compare Immediate Instruction The 8 bit data specified in the instruction is compared with the contents of the accumulator. The comparison is done by subtracting
Q. How oscillations start up in an oscillator? The noise voltage produced due to the random motion of electrons in resistors or in active devices provides the starting voltage
what is the formula for sag?
Q. What layers are covered under end to end layer connectivity? Layers 4-7 of ISO-OSI reference model communicate with peer entities in end systems. In intermediate systems,th
3) The impedance for a 120 km, 230-kV line is given as j 0.9 ohm/km and j 0.6 ohm/km for self and mutual terms respectively; resistance is neglected. The mho characteristic for the
Q. A current i(t) = 20 cos(2π × 60)t A flows through a wire. Find the charge flowing, and the number of electrons per second that are passing some point in the wire.
Q. Slip-power controlled wound-rotor induction-motor drives? Slip power is that portion of the air-gap power that is not converted into mechanical power. The methods involving
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