A dc circuit can be represented by an internal voltage source of 50 V with an output resistance of 100 kΩ. In order to achieve accuracy better than 99% for voltage measurement across terminals, the voltage measuring device should have a resistance of at least _____ MΩ.
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Solution
In an oscilloscope, two Lissajous figure(X) and(Y) are observed. This indicates that ratio of vertical input signal frequency to that of horizontal input frequency are
In a dual stop integrating type digital voltmeter, the first integration is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is
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Solution
The characteristics polynomial of a system is
q(s) = 2s5+ s4 + 4s3 + 2s2 + 2s + 1.
The system is
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Solution
Characteristics equation is
(2s+ 1) (s4+ 2s2+ 1) =0
The roots are s= – 0.5
s= +j, ± j
Since double roots are present on the imaginary axis and one root at negative real axis, there fore system response will be oscillatory.
Eigen values of the matrix A= \(\begin{bmatrix} 8\: -6\: 2 & & \\ -6\: 7\: -4 & & \\ 2\: -4\: 3 & & \end{bmatrix}\) are
In the TTL circuit in the figure given below S2 to S0 are select lines and X7 to X0 are input lines. S0 and X0 are LSBs. The output Y is
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Solution
In the figure given below, assume the OP-AMPs to be ideal. The output v0 of the circuit is
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Solution
Equation of the plane which passes through the point(3, –3, 1) and is parallel to the plane 2x+ 3y+ 5z+ 6 =0 is
The inverting OP-AMP shown in the figure below has an open-loop gian of 100. The closed-loop gain \(\frac{V_{0}}{V_{s}}\) is
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Solution
If \(\bar{R}=x\hat{i}+y\hat{j}-z\hat{k}\), then \(\bar{V}.\bar{R}\) is _________
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Solution
3