# Competitive Exams: Electronics MCQs (Practice_Test 8 of 13)

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- A non inverting closed loop op amp circuit generally has a gain factor
- Less than one
- Greater than one
- Of zero
- Equal to one

Answer: b

- If ground is applied to the (+) terminal of an inverting op-amp, the (—) terminal will
- Not need an input resistor
- Be virtual ground
- Have high reverse current
- Not invert the signal

Answer: b

- The closed-loop voltage gain of an inverting amplifier equal to
- The ratio of the input resistance to feedback resistance
- The open-loop voltage gain
- The feedback resistance divided by the input resistance
- The input resistance

Answer: c

- An ideal OP-AMP is an ideal
- Current controlled Current source
- Current controlled voltage source
- Voltage controlled voltage source
- voltage controlled current source

Answer: b

- Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5 k and C1 = 0.05 F
- 1.273kHz
- 12.73kHz
- 127.3 kHz
- 127.3 Hz

Answer: a

- How many op-amps are required to implement this equation Vo = V1
- 4
- 3
- 2
- 1

Answer: d

- An OPAMP has a slew rate of 5 V/µS. The largest sine wave O/P voltage possible at a frequency of 1 MHZ is
- 10 volts
- 5 volts
- volts
- volts

Answer: d