1. Monolithic ICs are
a. Forms of discrete circuits
b. On a single chip
c. Combinations of thin-film and thick-film circuits
d. Also called hybrid ICs
b
2. The op amp can amplify
a. AC signals only
b. DC signals only
c. Both ac and dc signals
d. Neither ac nor dc signals
c
3. Components are soldered together in
a. Discrete circuits
b. Integrated circuits
c. SSI
d. Monolithic ICs
a
4. The tail current of a diff amp 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
c
5. The node voltage at the top of the tail resistor is closest to
a. Collector supply voltage
b. Zero
c. Emitter supply voltage
d. Tail current times base resistance
b
6. The input offset current equals the
a. Difference between two base currents
b. Average of two base currents
c. Collector current divided by current gain
d. Difference between two base-emitter voltages
a
7. The tail current equals the
a. Difference between two emitter currents
b. Sum of two emitter currents
c. Collector current divided by current gain
d. Collector voltage divided by collector resistance
b
8.The voltage gain of a diff amp with a differential output is equal to RC divided by
a. re'
b. re'/2
c. 2re'
d. RE
a
9. The input impedance of a diff amp equals re' times
a. 0
b. RC
c. RE
d. 2 times Beta
d
10. A dc signal has a frequency of
a. 0
b. 60 Hz
c. 0 to over 1 MHz
d. 1 MHz
a
11. When the two input terminals of a diff amp are grounded,
a. The base currents are equal
b. The collector currents are equal
c. An output error voltage usually exists
d. The ac output voltage is zero
c
12. One source of output error voltage is
a. Input bias current
b. Difference in collector resistors
c. Tail current
d. Common-mode voltage gain
b
13. A common-mode signal is applied to
a. The noninverting input
b. The inverting input
c. Both inputs
d. Top of the tail resistor
c
14. The common-mode voltage gain is
a. Smaller than voltage gain
b. Equal to voltage gain
c. Greater than voltage gain
d. None of the above
a
15. The input stage of an op amp is usually a
a. Diff amp
b. Class B push-pull amplifier
c. CE amplifier
d. Swamped amplifier
a
16. The tail of a diff amp acts like a
a. Battery
b. Current source
c. Transistor
d. Diode
b
17. The common-mode voltage gain of a diff amp is equal to RC divided by
a. re'
b. re'/2
c. 2re'
d. 2RE
d
18. When the two bases are grounded in a diff amp, the voltage across each emitter diode is
a. Zero
b. 0.7 V
c. The same
d. High
c
19. The common-mode rejection ratio is
a. Very low
b. Often expressed in decibels
c. Equal to the voltage gain
d. Equal to the common-mode voltage gain
b
20. The typical input stage of an op amp has a
a. Single-ended input and single-ended output
b. Single-ended input and differential output
c. Differential input and single-ended output
d. Differential input and differential output
c
21. The input offset current is usually
a. Less than the input bias current
b. Equal to zero
c. Less than the input offset voltage
d. Unimportant when a base resistor is used
a
22. With both bases grounded, the only offset that produces an error is the
a. Input offset current
b. Input bias current
c. Input offset voltage
d. Beta
c
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