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The stator and rotor of a three-phase, 440-V, 15-hp, 60-Hz, eight-pole, wound-rotor induction motor are both connected in wye and have the following parameters per phase: R1 = 0.5 , R2 = 0.1 , Xl1 = 1.25 , and Xl2 = 0.2 . The magnetizing impedance is 40and the core loss impedance is 360 , both referred to the stator. The ratio of effective stator turns to effective rotor turns is 2.5. The friction andwindage losses total 200 W, and the stray-load loss is estimated as 100 W. Using the equivalent circuit, calculate the following values for a slip of 0.05 when the motor is operated at rated voltage and frequency applied to the stator, with the rotor slip rings short-circuited: stator input current, power factor at the stator terminals, current in the rotor winding, output power, output torque, and ef?ciency.
Q. If a feeder circuit-breaker trips, what action is needed? Ans: First isolate the faulty feeder check the faulty area on which fault the breaker was tripped (open circuit,
NOP No Operation Instruction No operation is performed when this instruction is executed. The instruction format is NOP All registers and flags re
Q. Basic working of Star Topology? In Star topology, all user nodes are connected to central node point that interconnects all individual users links and nodes. Data flows from
Q. In plotting a hysteresis loop the following scales are used: 1 cm = 400 At / mand 1 cm=0.3 T. The area of the loop for a certain magnetic material is found to be 6.2 cm 2 . Calc
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explain the waorking principle of function generator
Define a voltmeter A voltmeter is an instrument used to measure p.d. and must be linked in parallel with the part of the circuit whose p.d. is required.
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Using the BC548B BJT transistor amplifier biasing circuit of Lab 2 build an amplifier with the voltage gain of |A V | = 30 v/v ± = 10%. Measure all necessary parameters of the amp
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