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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.
It is required that the current floor position be displayed as a number 1, 2, or 3 on a seven segment LED display on floor 1, which is quite close to the LCU. Data Storage It
Calculate the N.A of a step index fibre having n 1 =1.48 and n 2 =1.46. What is the maximum entrance angle ψ max for this fibre if the outer medium is air with n 1 =1.0? Given
Q. Obtain a block diagram of a shift-left/right register using D flip-flops. Q. Design a 4-bit universal shift register. Q. (a) Show a block diagram of an SRFF connected to s
A 3-phase, wye-connected, 11.8 kV, 100 MVA turbo- generator of 0.8 power factor lagging has a synchronous reactance of 2.0 p.u. on rating. The generator is driven by a steam turbin
Role of GIS in Distribution Reforms: You will agree which distribution is the weakest link in the chain of power supply and has been identified as the key focus area in power
Ferroelectric materials are characterised by (A) Very high degree of polarisation. (B) A sharp dependence of polarisation on temperature. (C) Non-linear dependence o
reading type of cro probe
Holding current The holding current is the value of on state current required to maintain conduction once the device the device has fully timed on and the gate
Static Electricity : This is produced when two substances are rubbed together; the substances may be solids, liquids, or gases. Typical sources of static electricity are: i) dr
stress
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