Consider GaAsP system. Determine the range of the direct bandgap energies possible and the corresponding range of wavelength.

A three-phase line has an impedance of 1 + j2 Ω per phase. The line feeds two balanced three-phase loads that are connected in parallel. The first load is Y-connected and has an impedance of 20+j40 Ω per phase. The second load is ∆-connected and has an impedance of 30-j60 Ω per phase. The line-to-line voltage at the load end of the line is 415V. Taking the phase voltage Va as reference, determine: a) The total current per phase from the source end .b) The magnitude of the line voltage at the source end of the line c) The total 3-phase real and reactive powers absorbed by each load . d) The total 3-phase real and reactive power losses in the line. e) The real power and reactive power supplied at the source end of the line. f) If the second load is now connected in Y-connection with the same impedance of 30-j60 Ω per phase, what would be the current per phase supplied by the source

^{The secondary of a 500kVA, 4400/500 V, 50Hz, single-phase transformer has 500 turns.}

^{A) determine emf per unit.}

^{B) primary turns.}

^{C) secondary full load current}

^{D) maximum flux}

^{E) gross cross-sectional area of the core for flux density of 1.2 tesla}

^{F) if the core is square cross-section find the width of the limb}

Explain why several semiconductor materials might be put together to obtain more efficient solar cells.

Q1 (a)

(i) Mention the types of short circuit fault in power system network.

(ii) Briefly explain the effects of short-circuit type of faults on a power system network.

Design a Mealy state diagram for a sequence detector that has a single input and a single output. The output is to be “1” unless the input has been “0” for four consecutive clock pulses or “1” for three consecutive pulses. Implement your design using D flip-flops and any logic gates. Assume non-overlapping input sequences are to be detected.

The principle of “Hall Effect” is used in measuring high direct currents. Sketch the schematic diagram of Hall generator and explain how the working principle of high current measurement. In your explanation, write the mathematical equations related to the circuit ( if any).

what is the advantages to use PID controller in control system design ?

Illustrate the difference between different types of insulation and enumerate the various classes of electrical equipment. Give examples for each class.

Derive wave equation for H (eq. 9.7 in the textbook) from Maxwell’s equations for
source-free region filled with linear, homogeneous, and lossless material of permittivity ε and
permeability μ.

TE and TM Modes in rectangular waveguides and define the parameters of rectangular waveguides.

Assume $s0 = 0x00000005, compute the contents of the specified register after every step:

sll $s1, $s0, 2 #$s1 = ?

or $s1, $s1, $s0 #$s1 = ?

andi $s1, $s1, 15 #$s1 = ?

andi $s2, $s2, 0 #$s2 = ?

nor $s2, $s2, $s1 #$s2 = ?

Determine the stability region using the Jury criterion for a system whose characteristic equation P(z). Plot the stability region on a plane determined by a-k.
P(z)=z^4+kz^3+2z^2+az+3=0