MCQOPTIONS
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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.
| 701. |
The SCS is turned on with the cathode gate, and turned off with the anode gate. |
| A. | True |
| B. | False |
| Answer» C. | |
| 702. |
A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter. |
| A. | 2.46 kHz |
| B. | 1.23 kHz |
| C. | 644 Hz |
| D. | not enough information given |
| Answer» C. 644 Hz | |
| 703. |
An example of a pnp silicon transistor is a 2N4123. |
| A. | True |
| B. | False |
| Answer» C. | |
| 704. |
Which one of the following configurations has the lowest input impedance? |
| A. | Fixed-bias |
| B. | Common-base |
| C. | Emitter-follower |
| D. | Voltage-divider? |
| Answer» C. Emitter-follower | |
| 705. |
The peak value of the ac input signal is controlled by the ________ in a transistor network for the frequencies in the low to midrange. |
| A. | resistors |
| B. | applied dc voltage |
| C. | capacitors |
| D. | None of the above |
| Answer» C. capacitors | |
| 706. |
Which of the following instruments displays the harmonics of a distorted signal? |
| A. | Digital multimeter |
| B. | Spectrum analyzer |
| C. | Oscilloscope |
| D. | Wave analyzer |
| Answer» C. Oscilloscope | |
| 707. |
Refer to the given figure. This circuit is a setup for |
| A. | an antilog amplifier. |
| B. | a constant-current source. |
| C. | an instrumentation amplifier. |
| D. | an isolation amplifier. |
| Answer» E. | |
| 708. |
A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at its two input terminals. |
| A. | instrumentation |
| B. | isolation |
| C. | operational transconductance |
| D. | log |
| Answer» B. isolation | |
| 709. |
Refer to given circuits. Which circuit is known as a voltage-to-current converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 710. |
Refer to the given figure. This circuit is a setup for |
| A. | an antilog amplifier. |
| B. | a constant-current source. |
| C. | an instrumentation amplifier. |
| D. | an isolation amplifier. |
| Answer» C. an instrumentation amplifier. | |
| 711. |
The main purpose of an instrumentation amplifier is to amplify ________ signals that are riding on ________ common-mode voltages. |
| A. | small, small |
| B. | small, large |
| C. | large, small |
| D. | large, large |
| Answer» C. large, small | |
| 712. |
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 | |
| 713. |
Which of the following is (are) the determining factor(s) of the stability of a feedback amplifier? |
| A. | A |
| B. | Phase shift between input and output signals |
| C. | Both A and the phase shift between input and output signals |
| D. | None of the above |
| Answer» D. None of the above | |
| 714. |
This circuit is a ________ oscillator. |
| A. | phase-shift |
| B. | Wien bridge |
| C. | Colpitts |
| D. | Hartley |
| Answer» D. Hartley | |
| 715. |
The 7912 regulator IC provides ________ . |
| A. | 5 V |
| B. | 5 V |
| C. | 12 V |
| D. | 12 V |
| Answer» E. | |
| 716. |
Refer to this figure. Which symbol is correct for an LED? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| E. | e |
| Answer» B. b | |
| 717. |
The regulating ability of zener diodes depends on their ability to operate in a forward-bias condition. |
| A. | True |
| B. | False |
| Answer» C. | |
| 718. |
For normal operation of a pnp BJT, the base must be ________ with respect to the emitter and ________ with respect to the collector. |
| A. | positive, negative |
| B. | positive, positive |
| C. | negative, positive |
| D. | negative, negative |
| Answer» D. negative, negative | |
| 719. |
A common-emitter amplifier has the advantages of good voltage, current, and power gain, but the disadvantage of a relatively low input impedance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 720. |
When no light is emitted from an LED, the forward current is almost negligible and is called the dark current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 721. |
With varactor diodes, junction capacitance varies with the amount of forward-bias voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 722. |
The log of a number is the |
| A. | base to which the power must be raised to get that number. |
| B. | power to which the base must be raised to get that number. |
| C. | base of that number. |
| D. | power of that number. |
| Answer» C. base of that number. | |
| 723. |
What is a key characteristic of an instrumentation amplifier? |
| A. | high CMRR |
| B. | high output offset |
| C. | high output impedance |
| D. | none of the above |
| Answer» B. high output offset | |
| 724. |
In logarithmic signal compression, |
| A. | large and small voltages are compressed equally. |
| B. | large voltages are compressed more than small voltages. |
| C. | large voltages are compressed less than smaller voltages. |
| D. | none of the above |
| Answer» C. large voltages are compressed less than smaller voltages. | |
| 725. |
What part of the characteristic curve of a diode is useful for log amplifiers? |
| A. | the log region above 0.7 V |
| B. | the log region below 0.7 V |
| C. | the log region between 0 V and 0.7 V |
| D. | the log region below the zener voltage |
| Answer» D. the log region below the zener voltage | |
| 726. |
A(n) ________ amplifier provides "a barrier" between the input and output for the protection of human life or sensitive equipment. |
| A. | instrumentation |
| B. | isolation |
| C. | operational transconductance |
| D. | voltage-to-current |
| Answer» C. operational transconductance | |
| 727. |
The process known as signal compression is used with a(n) ____ amplifier. |
| A. | log |
| B. | antilog |
| C. | instrumentation |
| D. | isolation |
| Answer» B. antilog | |
| 728. |
Transconductance is the ratio of the output |
| A. | current to the input voltage. |
| B. | current to the input current. |
| C. | voltage to the input voltage. |
| D. | voltage to the input current. |
| Answer» B. current to the input current. | |
| 729. |
What is (are) the principal area(s) of application for isolation amplifiers? |
| A. | medical |
| B. | power plant |
| C. | automation |
| D. | all of the above |
| Answer» E. | |
| 730. |
Refer to the given figure. This circuit is a setup for |
| A. | an antilog amplifier. |
| B. | a constant-current source. |
| C. | an instrumentation amplifier. |
| D. | an isolation amplifier. |
| Answer» D. an isolation amplifier. | |
| 731. |
The OTA has a ________ input impedance and a ________ CMRR. |
| A. | high, low |
| B. | low, high |
| C. | high, high |
| D. | low, low |
| Answer» D. low, low | |
| 732. |
An antilog amplifier has a ________ in series with the input. |
| A. | BJT |
| B. | diode |
| C. | diode or BJT |
| D. | resistor |
| Answer» D. resistor | |
| 733. |
A constant-current source delivers a load current that |
| A. | remains constant when the load resistance changes. |
| B. | varies with load resistance. |
| C. | varies inversely with load resistance. |
| D. | varies inversely with input voltage. |
| Answer» B. varies with load resistance. | |
| 734. |
The operational transconductance amplifier (OTA) is primarily a ________ -to- ________ amplifier. |
| A. | current, voltage |
| B. | voltage, current |
| C. | current, resistance |
| D. | resistance, current |
| Answer» C. current, resistance | |
| 735. |
The main difference between the isolation amplifier and an instrumentation amplifier is |
| A. | an instrumentation amplifier has an input stage. |
| B. | an instrumentation amplifier has an output stage. |
| C. | an instrumentation amplifier has a differential stage. |
| D. | the input, output, and power supply stages of an isolation amplifier are all electrically isolated from each other. |
| Answer» E. | |
| 736. |
Refer to given circuits. Which circuit is known as a peak detector? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 737. |
A log amplifier may use the ________ junction of a BJT in the feedback loop. |
| A. | base-collector |
| B. | base-emitter |
| C. | emitter-collector |
| D. | emitter-ground |
| Answer» C. emitter-collector | |
| 738. |
A current-to-voltage converter produces a |
| A. | constant output voltage for a variable input current. |
| B. | variable output voltage for a constant input current. |
| C. | proportional output voltage for a variable input current. |
| D. | proportional output current for a variable input voltage. |
| Answer» D. proportional output current for a variable input voltage. | |
| 739. |
A log amplifier has ________ in the feedback loop. |
| A. | a diode |
| B. | a BJT |
| C. | a resistor |
| D. | either a diode or a BJT |
| Answer» E. | |
| 740. |
Refer to the given figure. This circuit is a setup for |
| A. | an antilog amplifier. |
| B. | a constant-current source. |
| C. | an instrumentation amplifier. |
| D. | an isolation amplifier. |
| Answer» B. a constant-current source. | |
| 741. |
The ability to keep the reverse current essentially constant is the key feature of the zener diode. |
| A. | True |
| B. | False |
| Answer» C. | |
| 742. |
An LED emits light when forward-biased. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 743. |
Refer to given circuits. Which circuit is known as a current-to-voltage converter? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 744. |
________ are areas of application for SCRs. |
| A. | Relay controls |
| B. | Time-delay circuits |
| C. | Motor controls |
| D. | All of the above |
| Answer» E. | |
| 745. |
The method(s) for turning off an SCR is (are) categorized as ________. |
| A. | current interruption |
| B. | forced commutation |
| C. | both current interruption and forced commutation |
| D. | None of the above |
| Answer» D. None of the above | |
| 746. |
The SCRs have typical turn-on times of ________ in the regeneration action. |
| A. | 0.1 s to 1 s |
| B. | 0.1 ms to 1 ms |
| C. | 3 ms to 5 ms |
| D. | 5 ms to 9 ms |
| Answer» B. 0.1 ms to 1 ms | |
| 747. |
An opto-isolator contains ________. |
| A. | an infrared LED |
| B. | a photodetector |
| C. | both an infrared LED and a photodetector |
| D. | None of the above |
| Answer» D. None of the above | |
| 748. |
A(n) ________ can be triggered in either direction. |
| A. | SCR |
| B. | Shockley diode |
| C. | diac |
| D. | SCS |
| Answer» D. SCS | |
| 749. |
In an isolation amplifier, the third op-amp is used as a unity-gain differential amplifier. |
| A. | True |
| B. | False |
| Answer» C. | |
| 750. |
At 65 C the minimum current that will trigger the series of an SCR is ________, while at +150 C only ________ is required. |
| A. | 20 mA, 100 mA |
| B. | 50 mA, 75 mA |
| C. | 75 mA, 50 mA |
| D. | 100 mA, 20 mA |
| Answer» E. | |