MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Crystal oscillator circuits have a very low Q. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The given circuit is ___. |
| A. | an inverting amplifier |
| B. | a noninverting amplifier |
| C. | a voltage follower |
| D. | a differential amplifier |
| Answer» C. a voltage follower | |
| 3. |
An oscillator whose frequency can be controlled by an input "control voltage" is called a(n) ______ . |
| A. | PLL |
| B. | Schmitt trigger |
| C. | VCO |
| D. | S-R latch |
| Answer» D. S-R latch | |
| 4. |
The voltage gain of the amplifier in the given circuit would increase if ______. |
| A. | the feedback resistor was decreased in value |
| B. | the input voltage was increased |
| C. | the input resistor was increased in value |
| D. | None of the above |
| Answer» E. | |
| 5. |
A virtual ground is a(n) ______ ground because this point is at zero volts. |
| A. | ordinary |
| B. | voltage |
| C. | chassis |
| D. | earth |
| Answer» C. chassis | |
| 6. |
The resistors Rf and Ri in an op-amp circuit control ______ . |
| A. | positive feedback and current gain |
| B. | negative feedback and power gain |
| C. | negative feedback and voltage gain |
| D. | open and closed loop gain |
| Answer» D. open and closed loop gain | |
| 7. |
______ is NOT a characteristic of an ideal op-amp. |
| A. | Infinite voltage gain |
| B. | Minimum bandwidth |
| C. | Infinite input impedance |
| D. | Zero output impedance |
| Answer» C. Infinite input impedance | |
| 8. |
Current cannot flow to ground through a(n) ________. |
| A. | mechanical ground |
| B. | ac ground |
| C. | virtual ground |
| D. | virtual short |
| Answer» D. virtual short | |
| 9. |
The input voltage must be ______ in the given circuit to obtain the given output voltage. |
| A. | 343 mV |
| B. | 400 mV |
| C. | 480 mV |
| D. | 600 mV |
| Answer» C. 480 mV | |
| 10. |
An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____ |
| A. | integrator |
| B. | differentiator |
| C. | differential amplifier |
| D. | voltage regulator |
| Answer» D. voltage regulator | |
| 11. |
The Q of a crystal _________. |
| A. | is extremely low |
| B. | is about 40 or so in most cases |
| C. | is extremely high |
| D. | none of the above |
| Answer» D. none of the above | |
| 12. |
The 555 timer can be connected to operate a(n) ___________. |
| A. | astable multivibrator |
| B. | bistable multivibrator |
| C. | monostable multivibrator |
| D. | astable multivibrator and a monostable multivibrator |
| Answer» E. | |
| 13. |
The voltage required to force the differential output to zero is called _______. |
| A. | input-offset current |
| B. | input-offset voltage |
| C. | input bias current |
| D. | slew rate voltage |
| Answer» C. input bias current | |
| 14. |
If the input to a comparator is a sine wave, the output is a(n) _________. |
| A. | ramp voltage |
| B. | sine wave |
| C. | sawtooth wave |
| D. | rectangular wave |
| Answer» E. | |
| 15. |
The common-mode rejection ratio (CMMR) is the ratio of _____ to ______. |
| A. | the differential voltage gain, the common-mode voltage gain |
| B. | the differential power gain, the common-mode power gain |
| C. | the ideal voltage gain, the actual voltage gain |
| D. | signal voltage, noise voltage |
| Answer» B. the differential power gain, the common-mode power gain | |
| 16. |
The voltage gain is ______ for the amplifier in the given circuit. |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 7 |
| Answer» D. 7 | |
| 17. |
An op-amp has very low open-loop gain. |
| A. | True |
| B. | False |
| Answer» C. | |
| 18. |
If an input signal is applied to the inverting input of an op-amp with the noninverting input grounded, the output signal would be opposite in polarity with the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
The TO-5 operational amplifier package can have 5 pins. |
| A. | True |
| B. | False |
| Answer» C. | |
| 20. |
Operational amplifiers (op-amps) use internal capacitive coupling between stages. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
An operational amplifier contains a differential amplifier, a voltage amplifier, and an output amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 22. |
If an input signal is applied to the inverting input of an op-amp with the noninverting input grounded, the output signal would be opposite in polarity to the input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 23. |
The inverting input is pin 2. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 24. |
An S-R flip-flop is an example of a bistable multivibrator circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 25. |
In a common-mode input to an op-amp, both inputs are connected to the same signal source. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 26. |
If the frequency of an astable multivibrator is 54.86 kHz then its period is 1.82 s. |
| A. | True |
| B. | False |
| Answer» C. | |
| 27. |
An open feedback resistor in an inverting or noninverting op-amp circuit can cause severe clipping of the output signal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
It takes 4 s for the output voltage of an op-amp to rise from 14 V to +14 V. The slew rate of this op-amp is 3.5 V/s. |
| A. | True |
| B. | False |
| Answer» C. | |
| 29. |
The difference between the upper and lower trigger points is called the Schmitt trigger. |
| A. | True |
| B. | False |
| Answer» C. | |
| 30. |
Changing the input voltage to an op-amp circuit will change its voltage gain. |
| A. | True |
| B. | False |
| Answer» C. | |
| 31. |
The feedback resistor adds to the gain of an op-amp. |
| A. | True |
| B. | False |
| Answer» C. | |
| 32. |
A 555 timer can be configured as an astable multivibrator. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 33. |
A monostable multivibrator must be triggered. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 34. |
The voltage-follower amplifier circuit has a fixed voltage gain of approximately 10. |
| A. | True |
| B. | False |
| Answer» C. | |
| 35. |
An astable multivibrator has two states. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 36. |
Current actually flows into or out of a virtual ground. |
| A. | True |
| B. | False |
| Answer» C. | |
| 37. |
A voltage-follower op-amp has the output connected directly to the inverting input. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 38. |
The frequency of a crystal is dependent on how much voltage is applied to activate it. |
| A. | True |
| B. | False |
| Answer» C. | |
| 39. |
If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by 2. |
| A. | True |
| B. | False |
| Answer» C. | |
| 40. |
An inverting amplifier has a phase shift of 180 from input to output. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 41. |
Common-mode signals have _____. |
| A. | the same amplitude |
| B. | the same phase |
| C. | the same frequency |
| D. | All of the above |
| Answer» E. | |
| 42. |
A circuit that has an output equal to the algebraic sum of the inputs is called a(n) ______ . |
| A. | integrator amplifier |
| B. | summing amplifier |
| C. | differential amplifier |
| D. | voltage multiplier |
| Answer» C. differential amplifier | |
| 43. |
A ______ is not a multivibrator. |
| A. | one-shot |
| B. | flip-flop |
| C. | VCO |
| D. | bistable |
| Answer» B. flip-flop | |
| 44. |
Feedback is used in an open-loop operational amplifier circuit. |
| A. | True |
| B. | False |
| Answer» C. | |
| 45. |
This circuit is a bandpass filter. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 46. |
This circuit is a voltage follower. |
| A. | True |
| B. | False |
| Answer» C. | |
| 47. |
If the two inputs to a differential amplifier are exactly the same, then the output is the signal multiplied by two. |
| A. | True |
| B. | False |
| Answer» C. | |
| 48. |
4 amperes will flow through a 10 resistor if 20 volts are placed across the resistor. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
An ohmmeter uses an internal battery to measure the resistance of a resistor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 50. |
A protoboard is used to make experimental circuits. |
| A. | True |
| B. | False |
| Answer» B. False | |