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.
| 1. |
Once a DIAC is conducting, the only way to turn it off is with: |
| A. | a positive gate voltage |
| B. | a negative gate voltage |
| C. | low-current dropout |
| D. | breakover |
| Answer» D. breakover | |
| 2. |
Which is the TRIAC? |
| A. | <img src="/_files/images/basic-electronics/complete/mca14_10011a1.gif" alt="mca14_10011a1.gif"> |
| B. | <img src="/_files/images/basic-electronics/complete/mca14_10011b1.gif" alt="mca14_10011b1.gif"> |
| C. | <img src="/_files/images/basic-electronics/complete/mca14_10011c1.gif" alt="mca14_10011c1.gif"> |
| D. | <img src="/_files/images/basic-electronics/complete/mca14_10011d1.gif" alt="mca14_10011d1.gif"> |
| Answer» E. | |
| 3. |
The DIAC is a: |
| A. | transistor |
| B. | unidirectional device |
| C. | three-layer device |
| D. | bidirectional device |
| Answer» E. | |
| 4. |
What type of application would use an injection laser diode? |
| A. | a 10BASE-T Ethernet |
| B. | a liquid crystal display |
| C. | a fiber optic transmission line |
| D. | a good flashlight |
| Answer» D. a good flashlight | |
| 5. |
The serial-in, parallel-out shift register transfers data from one parallel data bus to another parallel data bus one bit at a time across a single line. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
A serial-in, serial-out shift register transfers data from one line of a parallel bus to another line one bit at a time. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
"Half-splitting" is |
| A. | a means for nuclear fuel cells to produce electricity |
| B. | a means of isolating a problem in a circuit |
| C. | a means for reducing a high ac voltage to a low dc voltage |
| D. | a means of limiting current in a circuit |
| Answer» C. a means for reducing a high ac voltage to a low dc voltage | |
| 8. |
If doubling the voltage across a resistor doubles the current through the resistor then |
| A. | the resistor value decreased |
| B. | the resistor value did not change |
| C. | the resistor value increased |
| D. | it is impossible to determine the change in the resistor value |
| Answer» C. the resistor value increased | |
| 9. |
Power supplies are regulated to prevent the output voltage from changing due to changes in the |
| A. | line voltage |
| B. | supply load |
| C. | frequency |
| D. | both line voltage and supply load |
| Answer» E. | |
| 10. |
What is the power in the given circuit? |
| A. | 3.92 kW |
| B. | 280 W |
| C. | 28.6 W |
| D. | 9.8 W |
| Answer» E. | |
| 11. |
If current through a resistance is halved |
| A. | the resistance is halved |
| B. | the voltage is halved |
| C. | the voltage doubles |
| D. | none of the above |
| Answer» C. the voltage doubles | |
| 12. |
Ohm's law is a relationship between |
| A. | voltage, current, and time |
| B. | power, current, and resistance |
| C. | resistance, time, and current |
| D. | voltage, current, and resistance |
| Answer» E. | |
| 13. |
Ohm's law describes the mathematical relationship between |
| A. | ohms, kilohms, and megohms |
| B. | resistor size and resistor value |
| C. | resistance, voltage, and current |
| D. | none of the above |
| Answer» D. none of the above | |
| 14. |
Energy is defined as the ability to |
| A. | produce heat |
| B. | produce light |
| C. | produce sound |
| D. | All of the above |
| Answer» E. | |
| 15. |
What electromotive force would cause 20 A of current to flow through a 500 resistor? |
| A. | 0.04 V |
| B. | 2.5 V |
| C. | 25.0 V |
| D. | 10,000 V |
| Answer» E. | |
| 16. |
The rate at which work is performed is called |
| A. | current |
| B. | energy |
| C. | power |
| D. | voltage |
| Answer» D. voltage | |
| 17. |
A damaged resistor |
| A. | may appear burned |
| B. | may have an increased resistance value |
| C. | may be checked with an ohmmeter |
| D. | All of the above |
| Answer» E. | |
| 18. |
Power supplies differ from batteries in that |
| A. | power supply output voltages are ac and not dc |
| B. | power supply voltages are not stable |
| C. | power supplies are low-current devices |
| D. | None of the above |
| Answer» E. | |
| 19. |
If voltage across a resistance doubles |
| A. | the current is halved |
| B. | the resistance doubles |
| C. | the current is unchanged |
| D. | none of the above |
| Answer» E. | |
| 20. |
A multiplexed display circuit uses a technique called time division modulation. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
An asynchronous decade counter increases its value by ten for each clock pulse. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
A parallel-in, serial-out shift register enters all data bits simultaneously and transfers them out one bit at a time. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 23. |
The modulus (mod) of a counter is the same as its maximum count (N). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 24. |
A battery's capacity to deliver power is measured in |
| A. | kWh |
| B. | Ah |
| C. | Wh |
| D. | Vh |
| Answer» C. Wh | |
| 25. |
What is the power in the given circuit? |
| A. | 32 W |
| B. | 80 W |
| C. | 500 W |
| D. | 16 kW |
| Answer» B. 80 W | |
| 26. |
What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h? |
| A. | 43.75 |
| B. | 70 |
| C. | 43,750 |
| D. | 70,000 |
| Answer» C. 43,750 | |
| 27. |
If the voltage in the given circuit was cut in half, what would the current equal? |
| A. | 10 mA |
| B. | 30 mA |
| C. | 60 mA |
| D. | 90 mA |
| Answer» C. 60 mA | |
| 28. |
To operate correctly, starting a ring counter requires __________. |
| A. | clearing one flip-flop and presetting all the others |
| B. | clearing all the flip-flops |
| C. | presetting one flip-flop and clearing all the others |
| D. | presetting all the flip-flops |
| Answer» D. presetting all the flip-flops | |
| 29. |
A sequence of equally spaced timing pulses may be easily generated by a(n) __________. |
| A. | ring counter |
| B. | johnson counter |
| C. | binary up counter |
| D. | ripple counter |
| Answer» B. johnson counter | |
| 30. |
Counters are common components in digital clocks. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 31. |
In an asynchronous counter, each state is clocked by the same pulse. |
| A. | True |
| B. | False |
| Answer» C. | |
| 32. |
If the resistance in a circuit with constant voltage increases, the current will |
| A. | increase |
| B. | decrease |
| C. | stay the same |
| D. | Not enough information |
| Answer» C. stay the same | |
| 33. |
What is the power in the given circuit? |
| A. | 3.6 W |
| B. | 35 W |
| C. | 175 W |
| D. | 245 W |
| Answer» C. 175 W | |
| 34. |
When two counters are cascaded, the overall mod number is equal to the __________ of their individual mod numbers. |
| A. | product |
| B. | sum |
| C. | log |
| D. | reciprocal |
| Answer» B. sum | |
| 35. |
Ring and johnson counters are _______. |
| A. | asynchronous counters |
| B. | synchronous counters |
| C. | true binary counters |
| D. | asynchronous and true binary counters |
| Answer» C. true binary counters | |
| 36. |
A _________ shift register can shift stored data either left or right. |
| A. | bidirectional |
| B. | tri-state |
| C. | universal |
| D. | bidirectional universal |
| Answer» E. | |
| 37. |
How many bits are used in the address bus? |
| A. | 7 |
| B. | 8 |
| C. | 9 |
| D. | 16 |
| Answer» E. | |
| 38. |
How many buses are connected as part of the 8085 microprocessor? |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 8 |
| Answer» C. 5 | |
| 39. |
Exceptions to the 8085 microprocessor normal operation are called: |
| A. | jump instructions |
| B. | decoding |
| C. | interrupts |
| D. | jump instructions or interrupts |
| Answer» E. | |
| 40. |
The technique of assigning a memory address to each I/O device in the SAM system is called: |
| A. | wired I/O |
| B. | I/O mapping |
| C. | dedicated I/O |
| D. | memory-mapped I/O |
| Answer» E. | |
| 41. |
A port can be: |
| A. | strictly for input |
| B. | strictly for output |
| C. | bidirectional |
| D. | all the above |
| Answer» D. all the above | |
| 42. |
Synchronous construction reduces the delay time of a counter to the delay of __________. |
| A. | all flip-flops and gates |
| B. | a single flip-flop and a gate |
| C. | all flip-flops and gates after a 3 count |
| D. | a single gate |
| Answer» C. all flip-flops and gates after a 3 count | |
| 43. |
A 4-bit PISO shift register that receives 4 bits of parallel data will shift to the ________ by ________ position(s) for each clock pulse. |
| A. | right, one |
| B. | right, two |
| C. | left, one |
| D. | left, three |
| Answer» B. right, two | |
| 44. |
The only way to close an SCR is with: |
| A. | a trigger input applied to the gate |
| B. | forward breakover voltage |
| C. | low-current dropout |
| D. | valley voltage |
| Answer» C. low-current dropout | |
| 45. |
What is an SCR? |
| A. | a PNPN thyristor with 3 terminals |
| B. | a PNPN thyristor with 4 terminals |
| C. | a PNP thyristor with 3 terminals |
| D. | an NPN thyristor with 3 terminals |
| Answer» B. a PNPN thyristor with 4 terminals | |
| 46. |
What type of application would use a photovoltaic cell? |
| A. | an automobile horn |
| B. | a TI 92 calculator |
| C. | a magnetic field detector |
| D. | a remote power source |
| Answer» E. | |
| 47. |
Which is the seven-segment display? |
| A. | <img src="/_files/images/basic-electronics/complete/mca14_10013a1.gif" alt="mca14_10013a1.gif"> |
| B. | <img src="/_files/images/basic-electronics/complete/mca14_10013b1.gif" alt="mca14_10013b1.gif"> |
| C. | <img src="/_files/images/basic-electronics/complete/mca14_10013c1.gif" alt="mca14_10013c1.gif"> |
| D. | <img src="/_files/images/basic-electronics/complete/mca14_10013d1.gif" alt="mca14_10013d1.gif"> |
| Answer» B. <img src="/_files/images/basic-electronics/complete/mca14_10013b1.gif" alt="mca14_10013b1.gif"> | |
| 48. |
The time needed for a pulse to increase from 10% to 90% of its amplitude defines: |
| A. | pulse width |
| B. | propagation delay |
| C. | rise time |
| D. | duty cycle |
| Answer» D. duty cycle | |
| 49. |
Which device would best aid in shorted track detection? |
| A. | multimeter |
| B. | current tracer |
| C. | logic pulser |
| D. | oscilloscope |
| Answer» C. logic pulser | |
| 50. |
The use of a multimeter with digital circuits allows the measurement of: |
| A. | pulse width |
| B. | voltage or resistance |
| C. | current |
| D. | pulse trains |
| Answer» C. current | |