Competitive Exams: Electronics MCQs (Practice-Test 8 of 13)

  1. A non inverting closed loop op amp circuit generally has a gain factor

    1. Less than one

    2. Greater than one

    3. Of zero

    4. Equal to one

    Answer: b

  2. If ground is applied to the ( + ) terminal of an inverting op-amp, the ( — ) terminal will

    1. Not need an input resistor

    2. Be virtual ground

    3. Have high reverse current

    4. Not invert the signal

    Answer: b

  3. The closed-loop voltage gain of an inverting amplifier equal to

    1. The ratio of the input resistance to feedback resistance

    2. The open-loop voltage gain

    3. The feedback resistance divided by the input resistance

    4. The input resistance

    Answer: c

  4. An ideal OP-AMP is an ideal

    1. Current controlled Current source

    2. Current controlled voltage source

    3. Voltage controlled voltage source

    4. voltage controlled current source

    Answer: b

  5. Calculate the cutoff frequency of a first-order low-pass filter for R1 = 2.5 k and C1 = 0.05 F

    1. 1.273kHz

    2. 12.73kHz

    3. 127.3 kHz

    4. 127.3 Hz

    Answer: a

  6. How many op-amps are required to implement this equation Vo = V1

    1. 4

    2. 3

    3. 2

    4. 1

    Answer: d

  7. 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

    1. 10 volts

    2. 5 volts

    3. 5/3 volts

    4. 5/2 volts

    Answer: d