1
GATE EE 2008
+2
-0.6
A waveform generator circuit using $$OPAMPs$$ is shown in the figure. It produces a triangular wave at point $$'P'$$ with a peak to peak voltage of $$5V$$ for $${v_1} = 0\,V.$$

If the voltage $${v_1}$$ is made $$+2.5$$ $$V,$$ the voltage waveform at $$'P'$$ will become.

A
B
C
D
2
GATE EE 2007
+2
-0.6
The switch $$'S'$$ is the circuit of the figure is initially closed. It is opened at time $$t=0.$$ You may neglect the zener diode forward voltage drops. What is the behavior of $${V_{OUT}}$$ for $$t > 0$$
A
It makes a transition from $$- 5V$$ to $$+ 5V$$ at $$t=12.98$$$$\mu \sec .$$
B
It makes a transition from $$- 5V$$ to $$+ 5V$$ at $$t=2.57$$$$\mu \sec .$$
C
It makes a transition from $$+ 5V$$ to $$- 5V$$ at $$t=12.98$$$$\mu \sec .$$
D
It makes a transition from $$+ 5V$$ to $$- 5V$$ at $$t=2.57$$$$\mu \sec .$$
3
GATE EE 2007
+2
-0.6
The input signal $${V_{in}}$$ shown in the figure is a $$1$$ $$kHz$$ square wave voltage that alternates between $$+7V$$ and $$-7V$$ with a $$50\%$$ duty cycle. Both transistors have the same current gain, which is large. The circuit delivers power to the load resistor $${R_L}.$$ What is the efficiency of this circuit for the given input? Choose the closest answer.
A
$$46\%$$
B
$$55\%$$
C
$$63\%$$
D
$$92\%$$
4
GATE EE 2006
+2
-0.6
A relaxation oscillator is made using op-amp as shown in figure. The supply Voltage of the op-amp are $$\pm 12$$ the voltage waveform at point $$'p'$$ will be
A
B
C
D
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