ECE :: Exam Questions Paper
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It is required to match a 200 Ω load to a 450 Ω transmission line. To reduce the SWR along the line to 1, what must be the characteristic impedance of the quarter-wave transformer used for this purpose, if it is connected directly to the load?
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In an n-type silicon crystal at room temperature, which of the following can have a concentration of 4 x 1019 cm-3?
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Consider the following assertions
SI: For Zener effect at occur, a very abrupt junction is required
S2: For quantum tunnelling to occur, a very narrow energy barrier is required
Which of the following is correct? -
Given below a block diagram of oscillator circuit with various reactance elements.
For colpitts oscillator which is correct? -
For a series R-L-C circuit, the characteristic equation is given as
If
is denoted by a and 
by β, then under the condition of β2 > a2, the system will be -
In the epitaxial diffused method of fabricating integrating circuits the process involved are __________
- Epitaxial growth
- Diffusion
- Silicon diode growth
- Vacuum evaporation of aluminium
- Photoetching
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The switch in the circuit shown was on position a for a long time, and is moved to position b at time t = 0. The current i(t) for t > 0 is given by
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For a standard 2nd order system the maximum overshoot is 10% to an unit step input. If the magnitude of the input is doubled, then maximum overshoot and percentage of maximum overshoot is:
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A.
maximum overshoot doubles and percentage of maximum overshoot is less than double
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B.
maximum overshoot doubles and percentage of maximum overshoot do not change
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C.
maximum overshoot remain same and percentage of maximum overshoot is double
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D.
maximum overshoot more than double and percentage of maximum overshoot is less than double
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