811. Which of the following are integrating instruments ?
A. Ammeters
B. Voltmeters
C. Wattmeters
D. Ampere-hour and watt-hour meters

812. The tail current of a differential amplifier is_______________?
A. half of either collector current
B. equal to either collector current
C. two times either collector current
D. equal to the difference in base currents

813. A differential amplifier______________?
A. is a part of an Op-amp
B. has one input and one output
C. has two outputs
D. answers (A) and (B)

814. In the common mode, _______________?
A. both inputs are grounded
B. the outputs are connected together
C. an identical signal appears on both the inputs
D. the output signal are in-phase

815. With zero volts on both inputs, an OP-amp ideally should have an output _______________?
A. equal to the positive supply voltage
B. equal to the negative supply voltage
C. equal to zero
D. equal to CMRR

816. 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

817. The differential gain is _____________?
A. very high
B. very low
C. dependent on input voltage
D. about 100

818. 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

819. The common-mode gain is ________________?
A. very high
B. very low
C. always unity
D. unpredictable

820. If ADM = 3500 and ACM = 0.35, the CMRR is _______________?
A. 1225
B. 10,000
C. 80 dB
D. answers (A) and (B)

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