## 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
A.4
B.3
C.2
D.1

[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