User:Dadianilprasad

QUIZ QUESTIONS ON OPERATIONAL AMPLIFIERS

1.	Op-amp is ideal except finite gain A. V0=4V when Vi=4V. What is Op-amp gain A. [1M] A) 1000			B) 1001		C) 101			D) 100 2.	An op amp with an open-loop gain A=1000 is used in the inverting configuration. If in this application the output voltage ranges from −10 V to +10 V, what is the maximum voltage by which the “virtual ground node” departs from its ideal value? [1M] A) ±10mV		B) ±20mV			C) 10V			D) 20V 3.	Find the current io. Assume Op-amp is ideal. [2M] A) 1mA		B) 0.5mA		C) 5mA 		D) None of the above

4.	Consider the following circuit using an ideal OP-AMP. The I-V characteristic of the diode is described by the relation I=I0{exp(V/VT)-1} where VT= 25mV, I0=1μA and V is the voltage across the diode (taken as positive for forward bias). For an input voltage Vi = -1V, the output voltage V0 is 							[2M] A) 0.1V		B) 0.7V		C) 0.74V		D) None of the above 5.	In the circuit shown below the op-amps are ideal. Then, Vout in Volts is [2M] A) 4		B) 8			C) 12			D) 10

6.	For the Op-Amp circuit shown in the figure, V0 is			[2M][L3] A) -2V		B) -1V			C) -0.5V			D) 0.5V 7.	Find the output voltage of the given circuit if v1=3V and v2= -3V	 [1M] A) -1.5V			B) +1.5V		C) -0.5V		D) None of the above 8.	In the Op-Amp circuit shown, assume that the diode current follows the equation I=I0exp(V/VT) where VT= 25mV, I0=1μA and V is the voltage across the diode (taken as positive for forward bias). For an input voltage vi = 1V, the output voltage v0 =? [2M] A) -0.155V			B) +0.155V		C) -0.7V		D) 0.7V 9.	Find V0 of the circuit shown below. Assume Op-amp is ideal. [1M] A) -1V			B) +1V		C) +15V		D) -15V

10.	Consider the differentiator circuit using op-amp shown below. Assume Op-amp is ideal. If vi is a square wave, then v0 will be						[1M] A) positive spike 			B) negative spike C) positive spike & negative spike  	D) triangular wave 11.	Given Slew rate =1V/μs, fmax=2KHz. Find the maximum input signal allowed to have output without any distortion. [1M][L2][CO4] A) 25V 		B) 50V 		C) 15V			D) 30V 12.	The output voltage V0 of the circuit shown in the figure is		[2M] A) -2.75V 		B) +2.75V 		C) 0.2V			D) -2V