Which of the following is an Operational amplifier?

This question was previously asked in
RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. IC 8085
  2. IC 7805
  3. IC 741
  4. IC 555

Answer (Detailed Solution Below)

Option 3 : IC 741
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Detailed Solution

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The Pin diagram of 741 IC Op-amp is shown

  • 8 Pin IC
  • Pin 1 & 5 offset null pins
  • Pin 2 is inverting Input (V-)
  • Pin 3 is non-inverting Input (V+)
  • Pin 4 is - VEE supply
  • Pin 6 is for Output
  • Pin 7 is + Vcc supply


Pin 8 is not connected and not used

1. IC 8085 is a microprocessor programmable electronics chip. A single IC has a decision-making capability similar to that of a CPU present in mobile phones, washing machines, radars, satellites, etc. 

2. IC 7805 is a voltage regulator with output fixed at 5 V.

3. The IC 555 timer is an integrated circuit used in a variety of timer, pulse generation, and oscillator applications.

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