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.
| 651. |
Most practical alternators generate electricity from |
| A. | a coil rotating within a magnetic field |
| B. | a magnetic field rotating around fixed windings |
| C. | a permanent magnet rotating within a varying electromagnetic field |
| D. | none of the above |
| Answer» C. a permanent magnet rotating within a varying electromagnetic field | |
| 652. |
A half-cycle average voltage of 12 V is equal to what rms voltage? |
| A. | 13.33 V |
| B. | 8.48 V |
| C. | 18.84 V |
| D. | 7.64 V |
| Answer» B. 8.48 V | |
| 653. |
The ac input resistance (Rin) of a voltage-divider biased common-emitter amplifier consists of ____________. |
| A. | <img src="/_files/images/basic-electronics/basics/fba17_1004a1.gif" alt="fba17_1004a1.gif"> |
| B. | <img src="/_files/images/basic-electronics/basics/fba17_1004b1.gif" alt="fba17_1004b1.gif"> |
| C. | <img src="/_files/images/basic-electronics/basics/fba17_1004c1.gif" alt="fba17_1004c1.gif"> |
| D. | <img src="/_files/images/basic-electronics/basics/fba17_1004d1.gif" alt="fba17_1004d1.gif"> |
| Answer» C. <img src="/_files/images/basic-electronics/basics/fba17_1004c1.gif" alt="fba17_1004c1.gif"> | |
| 654. |
The collector current in a class A amplifier flows for ________ of the ac input signal. |
| A. | < 180 |
| B. | 180 |
| C. | < 360 |
| D. | 360 |
| Answer» E. | |
| 655. |
Removing a bypass capacitor from a common-emitter amplifier circuit will _________ voltage gain and ________ input resistance. |
| A. | increase, decrease |
| B. | decrease, increase |
| C. | decrease, decrease |
| D. | increase, increase |
| Answer» C. decrease, decrease | |
| 656. |
The gain of a BJT is called _______ and the gain of a JFET is called _______. |
| A. | beta, alpha |
| B. | transconductance, beta |
| C. | beta, transconductance |
| D. | transconductance, transconductance |
| Answer» D. transconductance, transconductance | |
| 657. |
When parallel resistors are of three different values, which has the greatest power loss? |
| A. | The smallest resistance |
| B. | The largest resistance |
| C. | They have the same power loss. |
| D. | Voltage and resistance values are needed. |
| Answer» B. The largest resistance | |
| 658. |
What is the product-over-sum result of 150 and 6800? |
| A. | 150 |
| B. | 146.7 |
| C. | 0.006 |
| D. | 6800 |
| Answer» C. 0.006 | |
| 659. |
The voltage across any branch of a parallel circuit: |
| A. | varies as the total current varies |
| B. | is inversely proportional to total circuit resistance |
| C. | is equally applied to all branch conductances |
| D. | is dropped in proportion to each branch resistance |
| Answer» D. is dropped in proportion to each branch resistance | |
| 660. |
What happens to total resistance in a circuit with parallel resistors if one of them opens? |
| A. | It increases. |
| B. | It halves. |
| C. | It remains the same. |
| D. | It decreases. |
| Answer» B. It halves. | |
| 661. |
A certain amplifier has a voltage gain of 210. That gain expressed in decibels is 46.4 dB. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 662. |
A decrease in base current of a CE amplifier causes the voltage measured between the emitter and the collector to increase. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 663. |
In an n-type JFET, current will flow when a positive voltage is applied to the drain and a negative voltage is applied to the source. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 664. |
An essential requirement of a feedback oscillator is a phase shift around the feedback loop of 360 . |
| A. | True |
| B. | False |
| Answer» B. False | |
| 665. |
If 60 J of energy are available for every 15 C of charge, what is the voltage? |
| A. | 4 V |
| B. | 60 V |
| C. | 15 V |
| D. | 0.25 V |
| Answer» B. 60 V | |
| 666. |
What is the color code for a 220 5% resistor? |
| A. | Red, Red, Brown, Gold |
| B. | Orange, Orange, Black, Gold |
| C. | Red, Red, Black, Gold |
| D. | Red, Red, Brown, Silver |
| Answer» B. Orange, Orange, Black, Gold | |
| 667. |
An atom's atomic number is determined by the number of: |
| A. | neutrons minus protons |
| B. | protons |
| C. | electrons |
| D. | neutrons |
| Answer» C. electrons | |
| 668. |
A voltage will influence current only if the circuit is: |
| A. | open |
| B. | insulated |
| C. | high resistance |
| D. | closed |
| Answer» E. | |
| 669. |
Which resistive component is designed to be temperature sensitive? |
| A. | Thermistor |
| B. | Rheostat |
| C. | Potentiometer |
| D. | Photoconductive cell |
| Answer» B. Rheostat | |
| 670. |
The ___ oscillator takes advantage of the piezoelectric effect. |
| A. | crystal |
| B. | Hartley |
| C. | Colpitts |
| D. | <i>RC</i> |
| Answer» B. Hartley | |
| 671. |
In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the product of Av B equals_______. |
| A. | reduced, one |
| B. | reduced, less than one |
| C. | increased, more than one |
| D. | increased, much greater than one |
| Answer» B. reduced, less than one | |
| 672. |
Pico is what relation to micro? |
| A. | one-tenth |
| B. | one-hundredth |
| C. | one-thousandth |
| D. | one-millionth |
| Answer» E. | |
| 673. |
The power gain (Ap) of any transistor amplifier circuit equals the ___________. |
| A. | current gain squared |
| B. | current gain times the voltage gain |
| C. | voltage gain times the output resistance |
| D. | current gain plus the voltage gain |
| Answer» C. voltage gain times the output resistance | |
| 674. |
If the drain, source, and channel of a MOSFET are all a p-type material, and it operates in both modes, this is an n-channel D-MOSFET. |
| A. | True |
| B. | False |
| Answer» C. | |
| 675. |
A practical CE amplifier has the input on the base and the output taken off the emitter. |
| A. | True |
| B. | False |
| Answer» C. | |
| 676. |
The maximum peak-to-peak output voltage in the given circuit is 15 V. |
| A. | True |
| B. | False |
| Answer» C. | |
| 677. |
Base currents are usually small because of the physical construction of the thin and lightly doped base. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 678. |
What is the name of the pressure that moves electrons in a closed circuit? |
| A. | amperes |
| B. | ohms |
| C. | voltage |
| D. | coulombs |
| Answer» D. coulombs | |
| 679. |
A lead-acid battery is an example of a |
| A. | solar cell |
| B. | fuel cell |
| C. | primary battery |
| D. | secondary battery |
| Answer» E. | |
| 680. |
A basic electric circuit is made up of what components? |
| A. | A load, a resistor, and a conductive path for current |
| B. | A voltage source, a load, and a conductive path for current |
| C. | A voltage source, a conductive path for current, and a battery |
| D. | A conductive path for current, a battery, and a copper wire |
| Answer» C. A voltage source, a conductive path for current, and a battery | |
| 681. |
An ammeter is used to measure |
| A. | voltage |
| B. | current |
| C. | resistance |
| D. | All of the above |
| Answer» C. resistance | |
| 682. |
The beta of a BJT is the ratio of collector current to emitter current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 683. |
Which unit of charge contains 6.25 1018 electrons? |
| A. | An ampere |
| B. | A coulomb |
| C. | A volt |
| D. | A joule |
| Answer» C. A volt | |
| 684. |
One coulomb passing a point in one second is one: |
| A. | ampere |
| B. | volt |
| C. | ohm |
| D. | charge |
| Answer» B. volt | |
| 685. |
In which states may matter may be found? |
| A. | solid, liquid, or mineral |
| B. | solid, gas, or liquid |
| C. | mineral, gas, or liquid |
| D. | plastic, solid, or gas |
| Answer» C. mineral, gas, or liquid | |
| 686. |
Material that consists of a mixture of elements is considered to be: |
| A. | an element |
| B. | an ion |
| C. | a compound |
| D. | a molecule |
| Answer» D. a molecule | |
| 687. |
How many valence shell electrons are there in semiconductor atoms? |
| A. | 16 |
| B. | 8 |
| C. | 4 |
| D. | 2 |
| Answer» D. 2 | |
| 688. |
Which voltage source converts chemical energy to electrical energy? |
| A. | Electrical generator |
| B. | Battery |
| C. | Solar cell |
| D. | Electronic power supply |
| Answer» C. Solar cell | |
| 689. |
An example of potential energy is: |
| A. | tea-kettle steam |
| B. | a moving vehicle |
| C. | the sun |
| D. | a battery |
| Answer» E. | |
| 690. |
When considering conventional current versus electron current flow: |
| A. | electron current flow came first |
| B. | protons move in conventional current flow |
| C. | conventional current flow came first |
| D. | the direction of current is the same in both methods |
| Answer» D. the direction of current is the same in both methods | |
| 691. |
Batteries differ from fuel cells in that |
| A. | a battery is a closed system |
| B. | a battery uses hydrogen and oxygen to create electricity |
| C. | a battery uses a polymer electrolyte membrane |
| D. | none of the above |
| Answer» B. a battery uses hydrogen and oxygen to create electricity | |
| 692. |
If 40 C of charge flow past a point in 20 s, what is the current? |
| A. | 2 A |
| B. | 0.5 A |
| C. | 20 A |
| D. | 40 A |
| Answer» B. 0.5 A | |
| 693. |
The removal of a non-neutral subatomic particle converts the atom into a: |
| A. | charged ion |
| B. | nucleus |
| C. | heavier element |
| D. | compound |
| Answer» B. nucleus | |
| 694. |
A voltmeter is used: |
| A. | to measure current |
| B. | in series with the circuit |
| C. | in parallel with the circuit |
| D. | to measure coulombs |
| Answer» D. to measure coulombs | |
| 695. |
Current equals: |
| A. | <img src="/_files/images/basic-electronics/complete/mca1_1002a1.gif" alt="mca1_1002a1.gif"> |
| B. | coulombs time |
| C. | <img src="/_files/images/basic-electronics/complete/mca1_1002c1.gif" alt="mca1_1002c1.gif"> |
| D. | voltage time |
| Answer» B. coulombs time | |
| 696. |
If the current in a circuit equals 0 A, it is likely that the |
| A. | voltage is too high |
| B. | resistance is too low |
| C. | circuit has a short |
| D. | circuit is open |
| Answer» E. | |
| 697. |
Which part of an atom has no electrical charge? |
| A. | Electron |
| B. | Neutron |
| C. | Proton |
| D. | All of the above |
| Answer» C. Proton | |
| 698. |
A switch is a device that: |
| A. | short circuits complex circuits |
| B. | holds a fuse |
| C. | has double poles |
| D. | opens or completes a current path |
| Answer» E. | |
| 699. |
The term used to designate electrical pressure is: |
| A. | voltage |
| B. | current |
| C. | resistance |
| D. | conductance |
| Answer» B. current | |
| 700. |
Current is considered as the movement of: |
| A. | electrons |
| B. | protons |
| C. | charge |
| D. | nuclei |
| Answer» B. protons | |