Operational Amplifier – 1 – 1

1. The ‘slew rate’ of an operational amplifier indicates (when a step input signal is given) :

(a) how fast its output current can change
(b) how fast its output impedance can change
(c) how fast its output power can change
(d) how fast its output voltage can change

ANSWER

EXPLANATION

2. The large signal bandwidth of an op-amp is limited by its :

(a) loop gain
(b) slew rate
(c) output impedance
(d) input frequency

ANSWER

EXPLANATION

3. The open-loop gain of an op-amp available in the market may be around.

(a) 10–1
(b) 101
(c) 105
(d) 10
2

ANSWER

EXPLANATION

4. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by :

(a) Av+Ac
(b) Av/Ac
(c) (Av/Ac)+1

(d) Ac/Av

ANSWER

EXPLANATION

5.  A differential amplifier ………..

(a) is a part of an OP-amp
(b) has one input and one output
(c) has two outputs
(d) a and c

ANSWER

EXPLANATION

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