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Operational Amplifier – 1 – 2

6. When a differential amplifier is operated single-ended, …………..

(a) the output is grounded
(b) one input is grounded and signal is applied to the other
(c) both inputs are connected together
(d) 
the output is not inverted

ANSWER

EXPLANATION

7. In differential-mode, …………..

(a) opposite polarity signals are applied to the inputs
(b) the gain is one
(c) the outputs are of different amplitudes
(d) 
only one supply voltage is used

ANSWER

EXPLANATION

8. In the common-mode, …………..

(a) both inputs are grounded
(b) the outputs are connected together
(c) an identical signal appears on both inputs
(d) 
the output signals are in-phase

ANSWER

EXPLANATION

9. The common-mode gain is ….

(a) very high
(b) very low
(c) always unity
(d) 
unpredictable

ANSWER

EXPLANATION

10. The differential gain is ….

(a) very high
(b) very low
(c) dependent on input voltage
(d) 
about 100

ANSWER

EXPLANATION

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