MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 651. |
A ________ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» D. band-stop | |
| 652. |
Refer to figure given below. Determine the value of VGS. |
| A. | 20 V |
| B. | 8 V |
| C. | 6 V |
| D. | 2 V |
| Answer» D. 2 V | |
| 653. |
Which of the following devices has the highest input resistance? |
| A. | diode |
| B. | JFET |
| C. | MOSFET |
| D. | bipolar junction transistor |
| Answer» D. bipolar junction transistor | |
| 654. |
The value of VGS that makes ID approximately zero is the |
| A. | pinch-off voltage. |
| B. | cutoff voltage. |
| C. | breakdown voltage. |
| D. | ohmic voltage. |
| Answer» C. breakdown voltage. | |
| 655. |
What three areas are the drain characteristics of a JFET (VGS = 0) divided into? |
| A. | ohmic, constant-current, breakdown |
| B. | pinch-off, constant-current, avalanche |
| C. | ohmic, constant-voltage, breakdown |
| Answer» B. pinch-off, constant-current, avalanche | |
| 656. |
What type(s) of gate-to-source voltage(s) can a depletion MOSFET (D-MOSFET) operate with? |
| A. | zero |
| B. | positive |
| C. | negative |
| D. | any of the above |
| Answer» E. | |
| 657. |
Which of the following oscillators is (are) tuned oscillators? |
| A. | Colpitts |
| B. | Hartley |
| C. | Crystal |
| D. | All of the above |
| Answer» E. | |
| 658. |
What is the relationship between the series and parallel resonant frequencies of a quartz crystal? |
| A. | They are equal. |
| B. | Parallel resonant frequency is approximately 1 kHz higher than series resonant frequency. |
| C. | Series resonant frequency is approximately 1 kHz higher than parallel resonant frequency. |
| D. | none of the above |
| Answer» C. Series resonant frequency is approximately 1 kHz higher than parallel resonant frequency. | |
| 659. |
An op-amp integrator has a square-wave input. The output should be |
| A. | a sine wave. |
| B. | a triangle wave. |
| C. | a square wave. |
| D. | pure dc. |
| Answer» C. a square wave. | |
| 660. |
At parallel resonance, the impedance of a crystal is |
| A. | minimum. |
| B. | maximum. |
| C. | equal. |
| D. | zero. |
| Answer» C. equal. | |
| 661. |
What is the typical value of quality factor for crystal oscillators? |
| A. | 20,000 |
| B. | 1000 |
| C. | 100 |
| D. | 10 |
| Answer» B. 1000 | |
| 662. |
Which of the following improvements is (are) a result of the negative feedback in a circuit? |
| A. | Higher input impedance |
| B. | Better stabilized voltage gain |
| C. | Improved frequency response |
| D. | All of the above |
| Answer» E. | |
| 663. |
Refer to the given figure. This circuit is known as |
| A. | a Clapp oscillator. |
| B. | an Armstrong oscillator. |
| C. | a Colpitts oscillator. |
| D. | a Hartley oscillator. |
| Answer» B. an Armstrong oscillator. | |
| 664. |
In the IC phase-shift oscillator, what should the ratio of feedback resistor Rf to R1 be? |
| A. | Zero |
| B. | Greater than 29 |
| C. | Less than 29 |
| D. | Any value |
| Answer» C. Less than 29 | |
| 665. |
At series resonance, the impedance of a crystal is |
| A. | minimum. |
| B. | maximum. |
| C. | equal. |
| D. | zero. |
| Answer» B. maximum. | |
| 666. |
An input signal is needed for an oscillator to start. |
| A. | True |
| B. | False |
| Answer» C. | |
| 667. |
Referring to this figure, calculate the amplification gain with feedback for the following circuit values: R1 = 80 k, R2 = 20 k, Ro = 10 k, RD = 61 k, and gm = 4000 S. |
| A. | 4.36 |
| B. | 4.25 |
| C. | 6.35 |
| D. | 20.85 |
| Answer» B. 4.25 | |
| 668. |
Calculate the resonant frequency of this Wien bridge oscillator if R1 = 25 k, R2 = 40 k, C1 = 0.001 F, and C2 = 0.002 F. |
| A. | 1560.3 Hz |
| B. | 1779.4 Hz |
| C. | 3120.7 Hz |
| D. | 3558.8 Hz |
| Answer» E. | |
| 669. |
Referring to this figure, calculate the amplification gain where the op-amp gain (A) is 200,000, R1 = 1.5 k, and R2 = 400 . |
| A. | 4.25 |
| B. | 4.50 |
| C. | 4.75 |
| D. | 5.00 |
| Answer» D. 5.00 | |
| 670. |
Referring to this figure, calculate the voltage gain with feedback Avf. |
| A. | 4.85 |
| B. | 4.20 |
| C. | 4.17 |
| D. | 4.00 |
| Answer» D. 4.00 | |
| 671. |
In an SCR-based half-wave phase-control circuit, a diode is connected in series with the anode. |
| A. | True |
| B. | False |
| Answer» C. | |
| 672. |
Refer to this figure. Calculate the resonant frequency. |
| A. | 1.126 kHz |
| B. | 6.17 kHz |
| C. | 23.9 MHz |
| D. | 14.1 MHz |
| Answer» C. 23.9 MHz | |
| 673. |
A ________ filter rejects all frequencies within a specified band and passes all those outside this band. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» E. | |
| 674. |
Refer to this figure. This circuit is |
| A. | a sine-wave oscillator. |
| B. | a monostable multivibrator. |
| C. | an astable multivibrator. |
| D. | a VCO. |
| Answer» D. a VCO. | |
| 675. |
A circuit that can change the frequency of oscillation with an application of a dc voltage is sometimes called |
| A. | a voltage-controlled oscillator. |
| B. | a crystal oscillator. |
| C. | a Hartley oscillator. |
| D. | an astable multivibrator. |
| Answer» B. a crystal oscillator. | |
| 676. |
This circuit is a ________ oscillator. |
| A. | phase-shift |
| B. | Wien bridge |
| C. | Colpitts |
| D. | Hartley |
| Answer» C. Colpitts | |
| 677. |
Sinusoidal oscillators operate with ________ feedback. |
| A. | positive |
| B. | negative |
| Answer» B. negative | |
| 678. |
The SCR is a device that can be triggered off by a pulse applied to the gate. |
| A. | True |
| B. | False |
| Answer» C. | |
| 679. |
In order to start up, a feedback oscillator requires |
| A. | negative feedback less than 1. |
| B. | positive feedback greater than 1. |
| C. | unity feedback equal to 1. |
| D. | no feedback. |
| Answer» C. unity feedback equal to 1. | |
| 680. |
UJTs can only be used to trigger triacs, not SCRs. |
| A. | True |
| B. | False |
| Answer» C. | |
| 681. |
Referring to this figure, calculate the voltage gain with the feedback for the following circuit values: RD = 4 k, RS = 1 k, RF = 15 k, and gm = 5000 S. |
| A. | 11.2 |
| B. | 8.57 |
| C. | 6.75 |
| D. | 3.25 |
| Answer» C. 6.75 | |
| 682. |
Filters with the ________ characteristic are useful when a rapid roll-off is required because it provides a roll-off rate greater than 20/dB/decade/pole. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| Answer» C. Bessel | |
| 683. |
It is best to check a transistor in-circuit before removing it. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 684. |
A BJT consists of three regions: base, emitter, and collector. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 685. |
BJT transistors are of two general types, npn and pnp. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 686. |
The ________ can be externally programmed to turn on at a desired anode-to-gate voltage level. |
| A. | UJT |
| B. | PUT |
| C. | SCR |
| D. | SCS |
| Answer» C. SCR | |
| 687. |
You need a very efficient thyristor to control the speed of an AC fan motor. A good device to use would be |
| A. | a 4-layer diode. |
| B. | a PUT. |
| C. | a triac. |
| D. | a BJT. |
| Answer» D. a BJT. | |
| 688. |
An application of a(n) ________ is in a lighting system for power interruptions. |
| A. | SCR |
| B. | SCS |
| C. | diac |
| D. | triac |
| Answer» B. SCS | |
| 689. |
Identify the symbol: |
| A. | SCS |
| B. | PUT |
| C. | LASCR |
| D. | diac |
| Answer» B. PUT | |
| 690. |
How much is the base-to-emitter voltage of a transistor in the "on" state? |
| A. | 0 V |
| B. | 0.7 V |
| C. | 0.7 mV |
| D. | Undefined |
| Answer» C. 0.7 mV | |
| 691. |
Identify the frequency response curve for a band-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 692. |
A ________ filter significantly attenuates all frequencies below fc and passes all frequencies above fc. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» C. band-pass | |
| 693. |
Refer to this figure. In the voltage-divider biased npn transistor circuit, if R1 opens, the transistor is |
| A. | saturated. |
| B. | cutoff. |
| C. | nonconducting. |
| Answer» C. nonconducting. | |
| 694. |
Refer to this figure. The output voltage at fcl = 12 mV. What is the output voltage at the midpoint frequency? |
| A. | 12 mV |
| B. | 12 mV p-p |
| C. | 16.97 mV |
| D. | 8.48 mV |
| Answer» D. 8.48 mV | |
| 695. |
Identify the p-channel E-MOSFET. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 696. |
The anode-to-gate voltage can be used to turn the PUT on or off. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 697. |
Doubling the voltage gain causes a ________ dB ________. |
| A. | 10, increase |
| B. | 6, increase |
| C. | 10, decrease |
| D. | 6, decrease |
| Answer» C. 10, decrease | |
| 698. |
________ frequencies are values of frequency at which the RC circuits reduce the voltage gain to 70.7% of its midrange value. |
| A. | Critical |
| B. | Cutoff |
| C. | Corner |
| D. | all of the above |
| Answer» E. | |
| 699. |
A roll-off of 20 dB per decade is equivalent to a roll-off of ________ per octave. |
| A. | 3 dB |
| B. | 13 dB |
| C. | 12 dB |
| D. | 6 dB |
| Answer» E. | |
| 700. |
An amplifier has an Rin = 1.2 k. The coupling capacitor is 1 F. Determine the approximate lower cutoff frequency. |
| A. | 133 Hz |
| B. | 1.33 kHz |
| C. | 13.3 kHz |
| D. | 133 kHz |
| Answer» B. 1.33 kHz | |