Chapter 18 Self Test: Linear Op-Amp Circuit Applications - Electronics Principles by Malvino/Bates

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

b

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

b

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

a

In a controlled current source with op amps, the circuit acts like a. Voltage amplifier b. Current-to-voltage converter c. Voltage-to-current converter d. Current amplifier

c

An instrumentation amplifier has a high a. Output impedance b. Power gain c. CMRR d. Supply voltage

c

A current booster on the output of an op amp will increase the short-circuit current by a. Av(CL) b. Idc c. funity d. Av

b

Given a voltage reference of 12.5 V, we can get a voltage reference of 115 V by using a. An inverting amplifier b. A noninverting amplifier c. A differential amplifier d. An instrumentation amplifier

b

In a differential amplifier, the CMRR is limited mostly by the a. CMRR of the op amp b. Gain-bandwidth product c. Supply voltages d. Tolerance of the resistors

d

The input signal for an instrumentation amplifier usually comes from a. An inverting amplifier b. A resistor c. A differential amplifier d. A Wheatstone bridge

d

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

a

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

b

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

c

A D/A converter is an application of the a. Adjustable bandwidth circuit b. Noninverting amplifier c. Voltage-to-current converter d. Summing amplifier

d

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

c

The Howland current source produces a. Unidirectional floating load current b. Bidirectional single-ended load current c. Unidirectional single-ended load current d. Bidirectional floating load current

b

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

c

1 ppm is equivalent to a. 0.1 percent b. 0.01 percent c. 0.001 percent d. 0.0001 percent

d

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

d

A thermistor converts a. Light to resistance b. Temperature to resistance c. Voltage to sound d. Current to voltage

b

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

a

A D/A converter with four inputs has a. Two output values b. Four output values c. Eight output values d. Sixteen output values

d

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

b

When a JFET is used in an AGC circuit, it acts like a. Switch b. Voltage-controlled current source c. Voltage-controlled resistance d. Capacitance

c

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

a