Characteristic of ideal Op-Amp

Q.  Which among the following is an incorrect characteristic of an ideal Op-Amp?
- Published on 23 Oct 15

a. Infinite CMRR & Slew Rate
b. Infinite Voltage gain
c. Infinite Bandwidth
d. Infinite output offset voltage when input voltage is zero

ANSWER: Infinite output offset voltage when input voltage is zero
 
An ideal Op-Amp has an infinite CMRR, Slew Rate & Bandwidth. But, the output voltage is absolutely zero when the input voltage is zero. All the mentioned parameters tend to infinity except output voltage & resistance so that it becomes feasible for an output to drive infinite number of other devices.

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