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How would you create a Magic Cube using a 3D matrix of size 3 x 3 x 3.
How would you visualise this data?

9)a)Design a Mod 12 counter.
b)Explain the ALT and CHOP modes of dual trace oscilloscope.

1. State with reasons whether the following statements are True or False.

i) The sound (audio) signal in television is transmitted using rastering.
ii) Reflection coefficient of a flat transmission line is unity.
iii) In amplitude shift keying (ASK) analog signal is modulated over a digital carrier signal.
iv) FDM and WDM are basically the same multiplexing techniques.
v) The listening experience is better in AM than in FM.
vi) In superheterodyne receiver it is impossible to avoid double spotting.
vii) Vestigial side band modulation reduces the band width of transmission.
viii) To split a microwave signal in two equal parts with opposite phases, H-plane
magic-T is used.
ix) Mesh topology is the most cost effective topology of computer network.
x) WAP reduces cluttering of wire connections in computers.

1.Identify imaging capabilities of the SEM
2.There is a collector situated in front of the scintillator in the Everhart-Thornley detector. Let us assume that this collector is under a voltage of i) +200 V, ii) 0 V, and iii) –100 V. Explain the differences, if any, in collection of signals by the detector for three above-listed SEM working conditions.
3: Calculate the maximum theoretical brightness for thermionic (tungsten) emitter operated at 5 kV accelerating voltage and a temperature of 2700K.
4. The filament made of lanthanum hexaboride (LaB6) can produce 5-10 times brighter electron beam than tungsten (W) filament does. Also lifetime of the LaB6 filament is 10 times longer than for the W filament. Explain why we cannot install the LaB6 filament in the JEOL JSM-35C SEM instrument, used in our laboratory sessions