MCQOPTIONS
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MCQOPTIONS
This section includes 65 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following require(s) interfacing circuitry? |
| A. | Keyboards |
| B. | Video terminals |
| C. | Printers |
| D. | All of the above |
| Answer» E. | |
| 2. |
For transistor transistor logic (TTL) circuits, ________ is a mark and ________ is a space. |
| A. | 12 V, 0 V |
| B. | 0 V, 12 V |
| C. | 0 V, 5 V |
| D. | 5 V, 0 V |
| Answer» E. | |
| 3. |
For the RS-232C circuit, ________ is a mark and ________ is a space. |
| A. | 12 V, –12 V |
| B. | –12 V, 12 V |
| C. | 5 V, 0 V |
| D. | –5 V, 0 V |
| Answer» C. 5 V, 0 V | |
| 4. |
In interfacing circuitry, a receiver provides ________ input impedance to minimize loading of the input signal. |
| A. | high |
| B. | medium |
| C. | low |
| D. | zero |
| Answer» B. medium | |
| 5. |
An input at a frequency of 1070 Hz will drive the decoder output voltage to ________. |
| A. | –5 V |
| B. | 14 V |
| C. | –5 V and 14 V |
| D. | None of the above |
| Answer» C. –5 V and 14 V | |
| 6. |
The free-running frequency of a 565 FSK decoder is adjusted with ________. |
| A. | external capacitors |
| B. | an external resistor |
| C. | an external RC network |
| D. | an internal clock |
| Answer» C. an external RC network | |
| 7. |
A phase-locked loop (PLL) is an electronic circuit that consists of ________. |
| A. | a phase detector |
| B. | a low-pass filter |
| C. | a voltage-controlled oscillator |
| D. | All of the above |
| Answer» E. | |
| 8. |
When the loop is in lock in a PLL, the input frequency is ________ the output frequency from the VCO. |
| A. | the same as |
| B. | greater than |
| C. | smaller than |
| D. | None of the above |
| Answer» B. greater than | |
| 9. |
In the frequency-shift keyed (FSK) signal decoder, the RC ladder filter is used to ________. |
| A. | remove the difference frequency component |
| B. | remove the sum frequency component |
| C. | remove both the difference and the sum frequency components |
| D. | None of the above |
| Answer» C. remove both the difference and the sum frequency components | |
| 10. |
The frequency of the 566 VCO is set by ________. |
| A. | an external resistor |
| B. | an external capacitor |
| C. | both an external resistor and an external capacitor |
| D. | None of the above |
| Answer» D. None of the above | |
| 11. |
A voltage-controlled oscillator (VCO) is a circuit that provides a ________ output signal. |
| A. | zero |
| B. | varying |
| C. | constant |
| D. | None of the above |
| Answer» C. constant | |
| 12. |
Time periods for monostable operation of the 555 timer can range from ________ to ________, making this IC useful for a range of applications. |
| A. | picoseconds, nanoseconds |
| B. | nanoseconds, milliseconds |
| C. | microseconds, many seconds |
| D. | None of the above |
| Answer» D. None of the above | |
| 13. |
In astable operation of the 555 timer, the lower and upper peaks of the charging/discharging external capacitor are ________ to ________. |
| A. | –VCC, VCC |
| B. | –0.5 VCC, 0.5 VCC |
| C. | 1/3 VCC, 1/2 VCC |
| D. | 1/3 VCC, 2/3 VCC |
| Answer» E. | |
| 14. |
In astable operation of the 555 timer, the external capacitor, C, is charged through external resistor(s) ________ and is discharged through resistor(s) ________. |
| A. | RA, RA |
| B. | RB, RA |
| C. | RA and RB, RB |
| D. | RB, RA and RB |
| Answer» D. RB, RA and RB | |
| 15. |
In a 555 timer, a series connection of three resistors sets the reference voltage levels to the two comparators at ________ and ________. |
| A. | 2VCC / 3, VCC / 3 |
| B. | VCC / 2, VCC / 4 |
| C. | VCC, VCC / 2 |
| D. | VCC, VCC |
| Answer» B. VCC / 2, VCC / 4 | |
| 16. |
The conversion resolution of an 8-stage counter operating an 8-stage ladder network using a reference voltage of 5 V is ________. |
| A. | 0.0195 mV |
| B. | 0.195 mV |
| C. | 1.95 mV |
| D. | 19.5 mV |
| Answer» E. | |
| 17. |
In a ladder-network conversion, the ________ circuit provides a signal to stop the counter when the staircase voltage rises above the input voltage. |
| A. | control logic |
| B. | comparator |
| C. | ladder-network |
| D. | None of the above |
| Answer» C. ladder-network | |
| 18. |
In a ladder-network conversion, ________ ladder stages provide ________ voltage resolution. |
| A. | more, greater |
| B. | more, smaller |
| C. | fewer, greater |
| D. | None of the above |
| Answer» B. more, smaller | |
| 19. |
In the operation of two 311 voltage comparators as the voltage window detector, a low output indicates that the input is ________. |
| A. | above the higher reference voltage |
| B. | below the lower reference voltage |
| C. | either above the higher reference voltage or below the lower reference voltage |
| D. | within the high and the low reference voltages |
| Answer» D. within the high and the low reference voltages | |
| 20. |
When the input to the 311 voltage comparator is ________ value, the output is ________ if the inverting input is connected to ground. |
| A. | any negative, low |
| B. | any positive, low |
| C. | any positive, high |
| D. | None of the above |
| Answer» C. any positive, high | |
| 21. |
In the operation of two 311 voltage comparators as the voltage window detector, a high output indicates that the input is ________. |
| A. | above the higher reference voltage |
| B. | below the lower reference voltage |
| C. | either above the higher reference voltage or below the lower reference voltage |
| D. | within the high and the low reference voltages |
| Answer» E. | |
| 22. |
The 311 voltage comparator can operate from ________. |
| A. | dual power supplies of 15 V |
| B. | a single +5 V supply |
| C. | either a dual power supply of 15 V or a single +5 V supply |
| D. | None of the above |
| Answer» D. None of the above | |
| 23. |
In a comparator, the reference voltage is connected to ________ input terminal and the input signal is applied to ________ input terminal. |
| A. | only the minus, only the plus |
| B. | only the plus, only the minus |
| C. | either the plus or minus, the other |
| D. | None of the above |
| Answer» D. None of the above | |
| 24. |
In a comparator, the level of the reference voltage must be ________. |
| A. | negative |
| B. | positive |
| C. | zero |
| D. | All of the above |
| Answer» E. | |
| 25. |
A comparator circuit accepts input of ________ voltages and provides a ________ output that indicates when one input is less than or greater than the second. |
| A. | linear, digital |
| B. | linear, linear |
| C. | digital, linear |
| D. | None of the above |
| Answer» B. linear, linear | |
| 26. |
Determine the free-running frequency when R3 is set to 2.5 k. |
| A. | 19.7 kHz |
| B. | 32.5 kHz |
| C. | 116.39 kHz |
| D. | 212.9 kHz |
| Answer» D. 212.9 kHz | |
| 27. |
Which of the following best describes limitations for the 566 VCO? |
| A. | [A]. |
| B. | [B]. |
| C. | fo < 1 MHz |
| D. | All of the above |
| Answer» E. | |
| 28. |
If |x2 - 3x + 2| > x2 - 3x + 2, then which one of the following is correct? |
| A. | x ≤ 1 or x ≥ 2 |
| B. | 1 ≤ x ≤ 2 |
| C. | 1 < x < 2 |
| D. | x is any real value except 3 and 4 |
| Answer» D. x is any real value except 3 and 4 | |
| 29. |
If the system of equationsx + y + z = 5x + 2y + 3z = 9x + 3y + αz = βhas infinitely many solutions, then β – α equals: |
| A. | 21 |
| B. | 8 |
| C. | 18 |
| D. | 5 |
| Answer» C. 18 | |
| 30. |
Every extreme point of the convex set all feasible solutions of the system AX = b is a - |
| A. | Feasible solution |
| B. | Basic feasible solution |
| C. | Optimum solution |
| D. | None of these |
| Answer» C. Optimum solution | |
| 31. |
If |2x - 3| < |x + 5| then x belongs to - |
| A. | (-3, 5) |
| B. | (5, 9) |
| C. | \(\left(-\dfrac{2}{3}, 8\right)\) |
| D. | \(\left(-8, \dfrac{2}{3}\right)\) |
| Answer» D. \(\left(-8, \dfrac{2}{3}\right)\) | |
| 32. |
If |a| denotes the absolute value of an integer, then which of the following are correct?1. |ab| = |a| |b|2. |a + b| ≤ |a| + |b|3. |a - b| ≥ ||a| - |b||Select the correct answer using the code given below. |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 33. |
If the system of linear equations2x + 2y + 3z = a3x – y + 5z = bx – 3y + 2z = cWhere a, b, c are non-zero real numbers, has more than one solution, then: |
| A. | b – c + a = 0 |
| B. | b – c – a = 0 |
| C. | a + b + c = 0 |
| D. | b + c – a = 0 |
| Answer» C. a + b + c = 0 | |
| 34. |
Determine the free-running frequency when R 3 is set to 2.5 k . |
| A. | 19.7 kHz |
| B. | 32.5 kHz |
| C. | 116.39 kHz |
| D. | 212.9 kHz |
| Answer» D. 212.9 kHz | |
| 35. |
Calculate the frequency of this circuit. |
| A. | 635 Hz |
| B. | 450 Hz |
| C. | 228 Hz |
| D. | 128 Hz |
| Answer» E. | |
| 36. |
Which of the following frequencies is associated with the 565 frequency-shift keyed decoder? |
| A. | 1070 Hz |
| B. | 1270 Hz |
| C. | Both 1070 Hz and 1270 Hz |
| D. | None of the above |
| Answer» D. None of the above | |
| 37. |
The timing components for a PLL are 15 k and 220 pF. Calculate the free-running frequency. |
| A. | 90.91 kHz |
| B. | 136.36 kHz |
| C. | 156.1 kHz |
| D. | 181.8 kHz |
| Answer» B. 136.36 kHz | |
| 38. |
What is the voltage resolution of an 8-stage ladder network? |
| A. | V ref /128 |
| B. | V ref /256 |
| C. | V ref /512 |
| D. | V ref /1024 |
| Answer» C. V ref /512 | |
| 39. |
Which of the following best describes the output of a 566 voltage-controlled oscillator? |
| A. | Square-wave |
| B. | Triangular-wave |
| C. | Both square- and triangular-wave |
| D. | None of the above |
| Answer» D. None of the above | |
| 40. |
Which of the following circuits is (are) linear/digital ICs? |
| A. | Comparators |
| B. | Timers |
| C. | Voltage-controlled oscillators |
| D. | All of the above |
| Answer» E. | |
| 41. |
Which of the following devices is (are) a component of a digital-to-analog converter (DAC)? |
| A. | Integrator |
| B. | Comparator |
| C. | Digital counter |
| D. | All of the above |
| Answer» E. | |
| 42. |
The 555 timer IC is made up of a combination of linear comparators and digital flip-flops. |
| A. | True |
| B. | False |
| C. | - |
| D. | - |
| Answer» B. False | |
| 43. |
How many comparators does a 339 IC contain? |
| A. | 4 |
| B. | 3 |
| C. | 2 |
| D. | 1 |
| Answer» B. 3 | |
| 44. |
When is the counter set to zero in the dual-slope method of conversion? |
| A. | Prior to the charging of the capacitor of the integrator |
| B. | While the capacitor is being charged |
| C. | At the end of the charging of the capacitor |
| D. | During the discharging of the capacitor |
| Answer» D. During the discharging of the capacitor | |
| 45. |
This circuit is an example of a ________. |
| A. | comparator |
| B. | 555 timer |
| C. | D to A converter |
| D. | ladder network |
| Answer» E. | |
| 46. |
What is (are) the input(s) to the comparator in the ladder-network conversion of an ADC? |
| A. | Staircase voltage |
| B. | Analog input voltage |
| C. | Both staircase and analog input voltage |
| D. | None of the above |
| Answer» D. None of the above | |
| 47. |
How many Vcc connections does the 565 PLL use? |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 48. |
At which of the following period(s) is the counter advanced (incremented) in dual-slope conversion? |
| A. | During the charging of the capacitor of the integrator |
| B. | During the discharging of the capacitor of the integrator |
| C. | During both the charging and discharging of the capacitor of the integrator |
| D. | None of the above |
| Answer» C. During both the charging and discharging of the capacitor of the integrator | |
| 49. |
What is (are) the level(s) of the input voltage to a ladder-network conversion? |
| A. | 0 |
| B. | V ref |
| C. | 0 V or V ref |
| D. | None of the above |
| Answer» D. None of the above | |
| 50. |
Determine the free-running frequency for this circuit. |
| A. | 32.5 kHz |
| B. | 53.33 kHz |
| C. | 533.3 kHz |
| D. | 5.3 MHz |
| Answer» C. 533.3 kHz | |