MCQOPTIONS
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MCQOPTIONS
This section includes 1728 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
The silicon-controlled rectifier can be turned off |
| A. | by a negative gate pulse |
| B. | by forced commutation |
| C. | with the off switch |
| D. | when the breakover voltage is exceeded |
| Answer» C. with the off switch | |
| 552. |
A commonly used pentavalent material is: |
| A. | arsenic |
| B. | boron |
| C. | gallium |
| D. | neon |
| Answer» B. boron | |
| 553. |
Forward bias of a silicon P-N junction will produce a barrier voltage of approximately how many volts? |
| A. | 0.2 |
| B. | 0.3 |
| C. | 0.7 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 554. |
A TRIAC: |
| A. | can trigger only on positive gate voltages |
| B. | can trigger only on negative gate voltages |
| C. | cannot be triggered with gate voltages |
| D. | can be triggered by either a positive or a negative gate voltage |
| Answer» E. | |
| 555. |
A series of gradually decreasing sine wave oscillations is called: |
| A. | ringing |
| B. | slew |
| C. | overshooting |
| D. | undershooting |
| Answer» B. slew | |
| 556. |
Mod-6 and mod-12 counters are most commonly used in: |
| A. | frequency counters |
| B. | multiplexed displays |
| C. | digital clocks |
| D. | power consumption meters |
| Answer» D. power consumption meters | |
| 557. |
What type of waveform is shown in the given circuit? |
| A. | Sine wave |
| B. | Square wave |
| C. | Triangle wave |
| D. | Sawtooth wave |
| Answer» D. Sawtooth wave | |
| 558. |
In both induction and synchronous ac motors |
| A. | the operating speed is very steady |
| B. | the stator magnetic field is stationary |
| C. | the stator magnetic field rotates |
| D. | the "squirrel cage" forms the rotor |
| Answer» D. the "squirrel cage" forms the rotor | |
| 559. |
What is the peak-to-peak voltage of the waveform in the given circuit? |
| A. | 2 V |
| B. | 4 V |
| C. | 6 V |
| D. | 8 V |
| Answer» E. | |
| 560. |
A connection to the frame of a piece of electronic equipment is sometimes referred to as ___ ground. |
| A. | a chassis |
| B. | an earth |
| C. | a circuit |
| D. | either chassis or circuit |
| Answer» E. | |
| 561. |
Fuses and circuit breakers are designed to ___ when excessive current flows. |
| A. | buzz |
| B. | illuminate |
| C. | close |
| D. | open |
| Answer» E. | |
| 562. |
The capacity of a battery cell is measured by the amount of __________ that can be supplied over time. |
| A. | current |
| B. | voltage |
| C. | coulombs |
| D. | joules |
| Answer» B. voltage | |
| 563. |
The total resistance is 480 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 564. |
The total power in a parallel circuit equals the sum of the individual branch powers. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 565. |
Current divider predicts that the most current will flow in the parallel path of the most resistance. |
| A. | True |
| B. | False |
| Answer» C. | |
| 566. |
The total resistance of like value resistors in parallel is equal to the value of the resistors multiplied by the number of resistors used. |
| A. | True |
| B. | False |
| Answer» C. | |
| 567. |
Parallel circuits have only one path for current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 568. |
The voltage in a parallel circuit is the same across each branch of the circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 569. |
The total power dissipated is 4.8 watts. |
| A. | True |
| B. | False |
| Answer» C. | |
| 570. |
If R1 opens in the given circuit, the total current equals ___. |
| A. | 86 mA |
| B. | 170 mA |
| C. | 42 mA |
| D. | 128 mA |
| Answer» E. | |
| 571. |
The potential difference between two points is called voltage. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 572. |
An open circuit allows current to flow. |
| A. | True |
| B. | False |
| Answer» C. | |
| 573. |
If an electronic component fails by developing an open circuit, the current will __________. |
| A. | increase |
| B. | decrease |
| C. | cease |
| D. | not change |
| Answer» D. not change | |
| 574. |
Charges of the same polarity tend to attract one another. |
| A. | True |
| B. | False |
| Answer» C. | |
| 575. |
The atomic number of an atom equals the number of electrons orbiting the nucleus. |
| A. | True |
| B. | False |
| Answer» C. | |
| 576. |
A normally open push-button switch can carry current when not pushed. |
| A. | True |
| B. | False |
| Answer» C. | |
| 577. |
In the eighteenth and nineteenth centuries conventional current flow was routinely used. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 578. |
Voltage is the driving force that establishes the flow of current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 579. |
A resistor color coded with brown, black, and orange bands has a value of 10 k. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 580. |
A conductor will not carry current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 581. |
The abundance of electrons would imply a negative charge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 582. |
An atom with more electrons than protons is ___. |
| A. | a positive ion |
| B. | a balanced atom |
| C. | a negative ion |
| D. | not possible |
| Answer» D. not possible | |
| 583. |
All resistors can be placed into one of two main categories: ___ or ___. |
| A. | carbon film, metal film |
| B. | fixed, variable |
| C. | wire wound, carbon-composition |
| D. | insulator, semiconductor |
| Answer» C. wire wound, carbon-composition | |
| 584. |
Voltage is _________. |
| A. | the opposition to the flow of current |
| B. | the movement of free electrons |
| C. | the force that exists between charged particles |
| D. | the force that causes water to flow |
| Answer» D. the force that causes water to flow | |
| 585. |
___ make electric current possible. |
| A. | Protons |
| B. | Neutrons |
| C. | Shells |
| D. | Free electrons |
| Answer» E. | |
| 586. |
The ___ represents a negative charge in an atom. |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | None of the above |
| Answer» B. proton | |
| 587. |
An atom of a semiconductor has _______________ electrons in the valence shell. |
| A. | 4 |
| B. | 8 |
| C. | 2 |
| D. | 0 |
| Answer» B. 8 | |
| 588. |
Switches are either on or off, but can have multiple poles. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 589. |
Switches are used to open and close paths for current. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 590. |
Carbon is a semiconductor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 591. |
The movement of electrons between two points is called voltage. |
| A. | True |
| B. | False |
| Answer» C. | |
| 592. |
Electrons flow from negative to positive when a voltage is applied across a conductor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 593. |
The symbol that represents electrical charge is Q. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 594. |
All conductors have some resistance. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 595. |
Resistance is the pressure that causes current to flow. |
| A. | True |
| B. | False |
| Answer» C. | |
| 596. |
If R2 opens in the given circuit, the voltage across R1 will ___. |
| A. | increase |
| B. | decrease |
| C. | equal 0 V |
| D. | remain unchanged |
| Answer» E. | |
| 597. |
A circuit is parallel between two points if ___ between those two points. |
| A. | the voltage divides |
| B. | more than one current path exists |
| C. | all resistors are equal |
| D. | there is only one current path |
| Answer» C. all resistors are equal | |
| 598. |
Circuit analysis should reveal that the largest resistance in a parallel circuit has the ______. |
| A. | least current |
| B. | most current |
| C. | least voltage |
| D. | most voltage |
| Answer» B. most current | |
| 599. |
An open resistor in parallel will cause the total ___ to increase. |
| A. | voltage |
| B. | current |
| C. | resistance |
| D. | power |
| Answer» D. power | |
| 600. |
The total power in the given circuit is ___. |
| A. | 4.8 mW |
| B. | 18 mW |
| C. | 7.2 mW |
| D. | 30 mW |
| Answer» E. | |