Topic Outline
- MCQs in Inverting Amplifier Circuits
- MCQs in Noninverting Amplifier Circuit
- MCQs in Inverter and Noninverter Circuits
- MCQs in Differential Amplifier
- MCQs in Instrumentation Amplifiers
- MCQs in Summing Amplifier Circuits
- MCQs in Current Boosters
- MCQs in Voltage Controlled Current Sources
- MCQs in Automatic Gain Control
- MCQs in Single Supply Operation
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
1. In a linear op-amp circuit, the
- a. Signals are always sine waves
- b. Op amp does not go into saturation
- c. Input impedance is ideally infinite
- d. Gain-bandwidth product is constant
2. In an ac amplifier using an op amp with coupling and bypass capacitors, the output offset voltage is
- a. Zero
- b. Minimum
- c. Maximum
- d. Unchanged
3. To use an op amp, you need at least
- a. One supply voltage
- b. Two supply voltages
- c. One coupling capacitor
- d. One bypass capacitor
4. In a controlled current source with op amps, the circuit acts like a
- a. Voltage amplifier
- b. Current-to-voltage converter
- c. Voltage-to-current converter
- d. Current amplifier
5. An instrumentation amplifier has a high
- a. Output impedance
- b. Power gain
- c. CMRR
- d. Supply voltage
6. A current booster on the output of an op amp will increase the short-circuit current by
- a. ACL
- b. Beta dc
- c. funity
- d. Av
7. Given a voltage reference of +2.5 V, we can get a voltage reference of +15 V by using a
- a. Inverting amplifier
- b. Noninverting amplifier
- c. Differential amplifier
- d. Instrumentation amplifier
8. In a differential amplifier, the CMRR is limited mostly by
- a. CMRR of the op amp
- b. Gain-bandwidth product
- c. Supply voltages
- d. Tolerance of resistors
9. The input signal for an instrumentation amplifier usually comes from
- a. An inverting amplifier
- b. A transducer
- c. A differential amplifier
- d. A Wheatstone bridge
10. In the classic three op-amp instrumentation amplifier, the differential voltage gain is usually produced by the
- a. First stage
- b. Second stage
- c. Mismatched resistors
- d. Output op amp
11. Guard driving reduces the
- a. CMRR of an instrumentation amplifier
- b. Leakage current in the shielded cable
- c. Voltage gain of the first stage
- d. Common-mode input voltage
12. In an averaging circuit, the input resistances are
- a. Equal to the feedback resistance
- b. Less than the feedback resistance
- c. Greater than the feedback resistance
- d. Unequal to each other
13. A D/A converter is an application of the
- a. Adjustable bandwidth circuit
- b. Noninverting amplifier
- c. Voltage-to-current converter
- d. Summing amplifier
14. In a voltage-controlled current source,
- a. A current booster is never used
- b. The load is always floated
- c. A stiff current source drives the load
- d. The load current equals ISC
15. The Howland current source produces a
- a. Unidirectional floating load current
- b. Bidirectional single-ended load current
- c. Unidirectional single-ended load current
- d. Bidirectional floating load current
16. The purpose of AGC is to
- a. Increase the voltage gain when the input signal increases
- b. Convert voltage to current
- c. Keep the output voltage almost constant
- d. Reduce the CMRR of the circuit
17. 1 ppm is equivalent to
- a. 0.1%
- b. 0.01%
- c. 0.001%
- d. 0.0001%
18. An input transducer converts
- a. Voltage to current
- b. Current to voltage
- c. An electrical quantity to a nonelectrical quantity
- d. A nonelectrical quantity to an electrical quantity
19. A thermistor converts
- a. Light to resistance
- b. Temperature to resistance
- c. Voltage to sound
- d. Current to voltage
20. When we trim a resistor, we are
- a. Making a fine adjustment
- b. Reducing its value
- c. Increasing its value
- d. Making a coarse adjustment
21. A D/A converter with four inputs has
- a. Two outputs
- b. Four outputs
- c. Eight outputs
- d. Sixteen outputs
22. An op amp with a rail-to-rail output
- a. Has a current-boosted output
- b. Can swing all the way to either supply voltage
- c. Has a high output impedance
- d. Cannot be less than 0 V.
23. When a JFET is used in an AGC circuit, it acts like a
- a. Switch
- b. Voltage-controlled current source
- c. Voltage-controlled resistance
- d. Capacitance
24. If an op amp has only a positive supply voltage, its output cannot
- a. Be negative
- b. Be zero
- c. Equal the supply voltage
- d. Be ac coupled
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