Electrical Engineering Answers

A 3-phase, 50 Hz, 4-pole, 400 V, wound rotor induction motor has a Δ-connected stator winding and Y-connected rotor winding. There are 80% as many rotor conductors as stator conductors. For speed of 1425 rpm, calculate the rotor induced emf between the two slip rings.

Connect two conductors to the sheath. Measure the capacitance, Cd between the remaining single conductor and the two other conductors and the sheath. Take the capacitance between the shorted cores and the sheath as Cb. Now determine the effective capacitance of each conductor to the grounded neutral.

1.How can i know the right frequency for operating any ferrite Core transformer that i have winded? 2. Enlighten me as to how to calculate for primary turns and voltage, and secondary turns and voltage.

(5) Threshold voltage of a short channel MOS transistor is smaller than the one of a

long channel MOS as ( ).

A. It occupies smaller area

B. The number of technological processes is small

C. Gate controls smaller number of charge

D. There are piled charges on the boundary of oxide-semiconductor junction

(6) The drain induced barrier lowering happens because of ( ).

A. High gate voltage in an NMOS device

B. High drain voltage that contributes in reducing the threshold voltage

C. The decrease in current in the channel due to high drain voltage

D. All of the above

What is the MOSFET short-channel effect, what causes it, and why is it 

undesirable?

 What is the cause of channel length modulation in a MOSFET?

explain the working principle and operation of BLDC motor

Find the impulse response h[n] for a causal LTI discrete-time systems satisfying the given

difference equations and indicate whether the system is a FIR or an IIR system.

y[n] + y[n - 1] = x[n] - 2x [n - 1]

Find the impulse response h[n] for a causal LTI discrete-time systems satisfying the given 
difference equations and indicate whether the system is a FIR or an IIR system.
y[n] = x[n] + 1/2 x[n - 1] + 2x [n - 2] + 4x[n - 3] - x[n - 5]

Determine the impulse response h of the following FIR system:

y[n] = x[n] + 1/2 x[n - 1] + 2x [n - 2] + 4x [n - 3] - x[n - 5]