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.
| 501. |
How many semiconductor layers are thyristors constructed with? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 502. |
Your boss has asked you to recommend a thyristor that will enable you to turn it on with a pulse and also turn it off with a pulse. Which of the following should you recommend? |
| A. | an SCR |
| B. | an SCS |
| C. | a PUT |
| D. | a triac |
| Answer» C. a PUT | |
| 503. |
PD(max) is usually specified at 25 C. For higher temperatures, the value of PD(max) is greater. |
| A. | True |
| B. | False |
| Answer» C. | |
| 504. |
If maximum IC and maximum VCE are applied to a BJT, maximum power dissipation will not be exceeded. |
| A. | True |
| B. | False |
| Answer» C. | |
| 505. |
DC = IE/IC |
| A. | True |
| B. | False |
| Answer» C. | |
| 506. |
Av RC/r'e |
| A. | True |
| B. | False |
| Answer» B. False | |
| 507. |
Refer to the given figure. This is a ________ filter, and it has a cutoff frequency of ________. |
| A. | high-pass, 21 Hz |
| B. | low-pass, 21 Hz |
| C. | high-pass, 2.65 kHz |
| D. | low-pass, 2.65 kHz |
| Answer» D. low-pass, 2.65 kHz | |
| 508. |
Refer to the given figure. RA = 2.2 k and RB = 1.2 k. This filter is probably a |
| A. | Butterworth type. |
| B. | Bessel type. |
| C. | Chebyshev type. |
| Answer» B. Bessel type. | |
| 509. |
Identify the frequency response curve for a high-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 510. |
Identify the frequency response curve for a low-pass filter. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 511. |
Refer to the given figure. This is a ________ filter. |
| A. | band-pass |
| B. | band-stop |
| C. | high-pass |
| D. | low-pass |
| Answer» B. band-stop | |
| 512. |
Which filter exhibits a linear phase characteristic? |
| A. | Bessel |
| B. | Butterworth |
| C. | Chebyshev |
| D. | all of the above |
| Answer» B. Butterworth | |
| 513. |
Refer to the given figure. The cutoff frequency of this filter is ________, and the circuit is known as a ________. |
| A. | 721 Hz, low-pass filter |
| B. | 721 Hz, high-pass filter |
| C. | 72 Hz, low-pass filter |
| D. | 721 Hz, band-pass filter |
| Answer» B. 721 Hz, high-pass filter | |
| 514. |
The critical frequency is defined as the point at which the response drops ________ from the passband. |
| A. | 20 dB |
| B. | 3 dB |
| C. | 6 dB |
| D. | 40 dB |
| Answer» C. 6 dB | |
| 515. |
Filters with the ________ characteristic provide a very flat amplitude in the passband and a roll-off rate of 20 dB/decade/pole. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| Answer» B. Chebyshev | |
| 516. |
The bandwidth in a ________ filter equals the critical frequency. |
| A. | low-pass |
| B. | high-pass |
| C. | band-pass |
| D. | band-stop |
| Answer» B. high-pass | |
| 517. |
Filters with the ________ characteristic are used for filtering pulse waveforms. |
| A. | Butterworth |
| B. | Chebyshev |
| C. | Bessel |
| Answer» D. | |
| 518. |
Refer to the given figure. The roll-off of this filter is about |
| A. | 20 dB/decade. |
| B. | 40 dB/decade. |
| C. | 60 dB/decade. |
| D. | 80 dB/decade. |
| Answer» B. 40 dB/decade. | |
| 519. |
Refer to the given figure. The roll-off of the circuit shown is about |
| A. | 20 dB/decade. |
| B. | 40 dB/decade. |
| C. | 60 dB/decade. |
| D. | 80 dB/decade. |
| Answer» B. 40 dB/decade. | |
| 520. |
What is (are) the component(s) of most specification sheets provided by the manufacturer? |
| A. | Maximum ratings |
| B. | Thermal characteristics |
| C. | Electrical characteristics |
| D. | All of the above |
| Answer» E. | |
| 521. |
What is the ratio of the total width to that of the center layer for a transistor? |
| A. | 1:15 |
| B. | 1:150 |
| C. | 15:1 |
| D. | 150:1 |
| Answer» E. | |
| 522. |
Which component of the collector current IC is called the leakage current? |
| A. | Majority |
| B. | Independent |
| C. | Minority |
| D. | None of the above |
| Answer» D. None of the above | |
| 523. |
How many individual pnp silicon transistors can be housed in a 14-pin plastic dual-in-line package? |
| A. | 4 |
| B. | 7 |
| C. | 10 |
| D. | 14 |
| Answer» B. 7 | |
| 524. |
Most specification sheets are broken down into ________. |
| A. | maximum ratings |
| B. | thermal characteristics |
| C. | electrical characteristics |
| D. | All of the above |
| Answer» E. | |
| 525. |
How many carriers participate in the injection process of a unipolar device? |
| A. | 1 |
| B. | 2 |
| C. | 0 |
| D. | 3 |
| Answer» B. 2 | |
| 526. |
dc for this set of collector characteristics is within ________ percent of ac. |
| A. | 2 |
| B. | 5 |
| C. | 7 |
| D. | 10 |
| Answer» E. | |
| 527. |
Determine the value of when = 100. |
| A. | 1.01 |
| B. | 101 |
| C. | 0.99 |
| D. | Cannot be solved with the information provided |
| Answer» D. Cannot be solved with the information provided | |
| 528. |
Transistors are ________-terminal devices. |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 529. |
Calculate dc at VCE = 15 V and IB = 30 A. |
| A. | 100 |
| B. | 116 |
| C. | 50 |
| D. | 110 |
| Answer» E. | |
| 530. |
Referring to this figure, calculate the voltage gain without feedback for the following circuit values: RD = 4 k, RS = 1 k, RF = 15 k, and gm = 5000 S. |
| A. | 20.0 |
| B. | 21.5 |
| C. | 23.5 |
| D. | 25.5 |
| Answer» B. 21.5 | |
| 531. |
For a phase-shift oscillator, the gain of the amplifier stage must be greater than ________. |
| A. | 19 |
| B. | 29 |
| C. | 30 |
| D. | 1 |
| Answer» C. 30 | |
| 532. |
What is the minimum frequency at which a crystal will oscillate? |
| A. | seventh harmonic |
| B. | third harmonic |
| C. | fundamental |
| D. | second harmonic |
| Answer» D. second harmonic | |
| 533. |
An amplifier with a gain of 500 and a feedback of = 0.1 has a gain change of 15% due to temperature. Calculate the change in gain of the feedback amplifier. |
| A. | 0.2% |
| B. | 0.3% |
| C. | 0.4% |
| D. | 0.5% |
| Answer» C. 0.4% | |
| 534. |
Refer to this figure. Determine the resonant frequency. |
| A. | 123.4 kHz |
| B. | 61.7 kHz |
| C. | 45.94 kHz |
| D. | 23.1 kHz |
| Answer» D. 23.1 kHz | |
| 535. |
The feedback signal in a(n) ________ oscillator is derived from an inductive voltage divider in the LC circuit. |
| A. | Hartley |
| B. | Armstrong |
| C. | Colpitts |
| Answer» B. Armstrong | |
| 536. |
The attenuation of the three-section RC feedback phase-shift oscillator is |
| A. | 1/9. |
| B. | 1/30. |
| C. | 1/3. |
| D. | 1/29. |
| Answer» E. | |
| 537. |
What regulated output voltage is provided for the following circuit elements: R1 = 15 k, R2 = 35 k, and VZ = 11.2 V? |
| A. | 16.50 V |
| B. | 17 V |
| C. | 17.35 V |
| D. | 18.25 V |
| Answer» C. 17.35 V | |
| 538. |
________ regulation can be defined as the percentage change in the output voltage for a given change in the input voltage. |
| A. | Line |
| B. | Load |
| Answer» B. Load | |
| 539. |
A ________ -wave rectified signal has less ripple than a ________ -wave rectified signal and is thus better to apply to a filter. |
| A. | full, half |
| B. | half, full |
| Answer» B. half, full | |
| 540. |
Refer to the given figure. If the output voltage tends to decrease due to an increase in load current, the transistor will conduct for ________ time each cycle. |
| A. | a longer |
| B. | a shorter |
| C. | the same |
| Answer» B. a shorter | |
| 541. |
The larger the value of the capacitor, the smaller the peak current drawn through the rectifying diodes. |
| A. | True |
| B. | False |
| Answer» C. | |
| 542. |
In a shunt linear regulator, the control element is a(n) ________ in parallel with the load. |
| A. | inductor |
| B. | capacitor |
| C. | transistor |
| Answer» D. | |
| 543. |
For what range of fixed regulated voltages do the series 78xx regulators provide regulation? |
| A. | +5 V to +24 V |
| B. | +5 V to +24 V |
| C. | 5 V to 24 V |
| D. | None of the above |
| Answer» C. 5 V to 24 V | |
| 544. |
For what range of load current can voltage regulators be selected for operation? |
| A. | Hundreds of picoamperes to tens of nanoamperes |
| B. | Hundreds of picoamperes to tens of milliamperes |
| C. | Hundreds of milliamperes to tens of amperes |
| D. | None of the above |
| Answer» D. None of the above | |
| 545. |
What type of regulator offers inherent short-circuit protection? |
| A. | shunt regulators |
| B. | series regulators |
| C. | three-terminal regulators |
| D. | switching regulators |
| Answer» B. series regulators | |
| 546. |
Refer to the given figure. The inductor and capacitor are used for |
| A. | amplifying the error signal. |
| B. | controlling the load current. |
| C. | turning on the pulse-width oscillator. |
| D. | filtering the dc pulse output. |
| Answer» E. | |
| 547. |
Refer to the given figure. If the BE junction of Q1 opens, the output voltage VOUT will |
| A. | increase. |
| B. | decrease. |
| C. | remain the same. |
| Answer» C. remain the same. | |
| 548. |
The 7905 regulator IC provides ________. |
| A. | 5 V |
| B. | 5 V |
| C. | 12 V |
| D. | 12 V |
| Answer» C. 12 V | |
| 549. |
Calculate ac for IC = 15 mA and VCE = 5 V. |
| A. | 200 |
| B. | 180 |
| C. | 220 |
| D. | None of the above |
| Answer» B. 180 | |
| 550. |
Use this table of collector characteristics to calculate ac at VCE = 15 V and IB = 30 A. |
| A. | 100 |
| B. | 106 |
| C. | 50 |
| D. | 400 |
| Answer» B. 106 | |