1
GATE ECE 2015 Set 1
MCQ (Single Correct Answer)
+2
-0.6
The circuit shown in the figure has an ideal opamp. The oscillation frequency and the condition to sustain the oscillations, respectively, are
A
$${1 \over {CR}}$$ and $$\,{R_1}\,\, = \,\,{R_2}$$
B
$${1 \over {CR}}$$ and $${R_1}\, = \,4{R_2}$$
C
$${1 \over {2CR}}$$ and $${R_1}\, = \,{R_2}$$
D
$${1 \over {2CR}}$$ and $${R_1}\,$$ = 4$${R_2}$$
2
GATE ECE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
Assuming that the Op-amp in the circuit shown is ideal, V0 is given by
A
$${5 \over 2}{V_1} - 3{V_2}$$
B
$$2{V_1} - {5 \over 2}{V_2}$$
C
$$- {3 \over 2}{V_1} + {7 \over 2}{V_2}$$
D
$$- 3{V_1} + {{11} \over 2}{V_2}$$
3
GATE ECE 2014 Set 1
Numerical
+2
-0
In the voltage regulator circuit shown in the figure, the op - amp is ideal. The BJT has VBE = 0.7 V and $$\beta$$ = 100, and the Zener voltage is 4.7 V. For a regulated output of 9 V, the value of R (in $$\Omega$$) is ______
4
GATE ECE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
In the circuit shown, the op-amp has finite input impedance, infinite voltage gain and zero input offset voltage. The output voltage Vout is
A
$$- {I_2}\left( {{R_1} + {R_2}} \right)$$
B
$${I_2}{R_2}$$
C
$${I_1}{R_2}$$
D
$$- {I_1}\left( {{R_1} + {R_2}} \right)$$
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