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Friday, February 15, 2019

Operational Amplifier (Objective Questions With Answers)

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[1]. A non inverting closed loop op amp circuit generally has a gain factor 
A. Less than one 
B. Greater than one 
C. Of zero 
D. Equal to one

[2]. If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will 
A. Not need an input resistor 
B. Be virtual ground 
C. Have high reverse current
D. Not invert the signal

[3] The closed-loop voltage gain of an inverting amplifier equal to 
A. The ratio of the input resistance to feedback resistance 
B. The open-loop voltage gain 
C. The feedback resistance divided by the input resistance 
D. The input resistance

[4]. When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains 
A. True 
B. False

[5]. An ideal OP-AMP is an ideal 
a) Current controlled Current source 
b) Current controlled voltage source 
c) Voltage controlled voltage source 
d) voltage controlled current source 

[6]. The ideal OP-AMP has the following characteristics. 
a) Ri=∞ ,A=∞ ,R0=0 
b) Ri=0 ,A=∞ ,R0=0 
c) Ri=∞ ,A=∞ ,R0=∞ 
d) Ri=0 ,A=∞ ,R0=∞

[7].Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5kΩ and C1 = 0.05Μf 
A. 1.273kHz 
B. 12.73kHz 
C. 127.3 kHz 
D. 127.3 Hz

[8]. How many op-amps are required to implement this equation
A. 2 
B. 3
C. 4 
D. 1

[9]. How many op-amps are required to implement this equation Vo = V1 

[10]. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is
A. 10 volts
B. 5 volts
C. 5/ volts 
D. 5/2 volts

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