QUESTIONS CARRY TWO MARKS EACH.
An OPAMP. has an offset voltage of 1 mV and is ideal in all other respects. If this OPAMP. is used in the circuit shown in the figure below, then output voltage will be(select nearest value)
-
Solution
QUESTIONS CARRY TWO MARKS EACH.
JEFT in the circuit shown in the given figure has an IDSS = 10 mA and Vp= 5V.The value of resistance Rs for a drain current IDS= 6.4 mA is (select nearest value)
-
Solution
QUESTIONS CARRY TWO MARKS EACH.
For good stabilised biasing of the transistor of the CE amplifier of given figure
-
Solution
QUESTIONS CARRY TWO MARKS EACH.
Two networks are connected in cascade as shown in the figure. With usual notations the equivalent A, B, C and D constants are obtained. Given that, C = 0.025 ∠45°,the value of Z2 is
-
10∠30° Ω
-
40∠45° Ω
-
1 Ω
-
0 Ω
-
Solution
QUESTIONS CARRY TWO MARKS EACH.
The circuit of given figure uses an ideal op amp. For small positive values of Vin, the circuit works as a/an
-
half wave rectifier
-
differentiator
-
logarithmic amplifier
-
exponential amplifier
-
Solution
QUESTIONS CARRY TWO MARKS EACH.
In the network shown, switch is opened at t= 0. Prior to that, network was in the steady-state, Vs (t) at 6 = 0 is _________
-
Solution
Since voltage across a capacitor can not change instantaneously, therefore at t= 0,i(0+) = 1A, Vs(t) =5V, Vc= 0
For the transfer function :
\(G(s)H(s)=\frac{1}{s(s+1)(s+0.5)}\)the phase cross-over frequency is_______ .
-
Solution
The system matrix of a continuous-time system, described in the state variable form is
\(A=\begin{bmatrix} x &0 &0 \\ 0 &y &-1 \\ 0 &1 &-2 \end{bmatrix}\)The system is stable for all values x and y satisfying
-
x < 1/2,y < 1/2
-
x > 1/2,y > 0
-
x< 0,y < 2
-
x< 0,y< 1/2
-
Solution
A control system is as shown in the figure below.The maximum value of gain K for which the system stable is
-
√3
-
3
-
4
-
5
-
Solution
A single phase 10 kVA, 50 Hz transformer with 1 kV primary winding draws 0.5 A and 55 W,at rated voltage and frequency,on no load. A second transformer has acore with all its linear dimensions √2 times the corresponding dimensions of the first transformer. The core material and lamination thickness are the same in both transformer. The primary winding of both the transformers have the save number of turns. If a rate voltage of 2 kV at 50 Hz is applied to the primary of the second transformer, then the no load current and power,respectively, are
-
0.7 A, 77.8 A
-
0.7 A, 155.6 W
-
1A, 110 W
-
1A, 220 W
-
Solution