MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which symbol represents a UJT? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» C. c | |
| 2. |
An SCR acts to control the speed of an electric motor by ________ the ________ of the pulse delivered to the motor. |
| A. | varying, width |
| B. | increasing, amplitude |
| C. | decreasing, gate width |
| D. | none of these |
| Answer» B. increasing, amplitude | |
| 3. |
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 | |
| 4. |
How many semiconductor layers are thyristors constructed with? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 5. |
You have a light-dimmer circuit using an SCR. In testing the circuit, you find that I G = 0 mA and the light is still on. You conclude that the trouble might be one of the following: |
| A. | the SCR is open. |
| B. | the switch is faulty. |
| C. | the gate circuit is shorted. |
| D. | this is normal; nothing is wrong. |
| Answer» E. | |
| 6. |
What is the correct symbol for an SCR? |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» B. b | |
| 7. |
Which of the following devices might best be used to control an electric motor? |
| A. | an SCS |
| B. | a PUT |
| C. | an SCR |
| D. | a diac |
| Answer» D. a diac | |
| 8. |
The ________ can conduct current in either direction and is turned on when a breakover voltage is exceeded. |
| A. | SCR |
| B. | diac |
| C. | SCS |
| D. | triac |
| Answer» C. SCS | |
| 9. |
The SCR can be triggered on by a pulse at the |
| A. | gate. |
| B. | anode. |
| C. | cathode. |
| D. | none of the above |
| Answer» B. anode. | |
| 10. |
You have a need to use a device to trigger an SCR. A good one to use might be |
| A. | an SCS. |
| B. | a UJT. |
| C. | a 4-layer diode. |
| D. | a PUT. |
| Answer» C. a 4-layer diode. | |
| 11. |
The ________ is like a diac with a gate terminal. |
| A. | triac |
| B. | SCR |
| C. | SCS |
| D. | none of the above |
| Answer» B. SCR | |
| 12. |
Identify the symbol for an SCS. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» D. d | |
| 13. |
You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a triac? |
| A. | an oscillator |
| B. | an ac motor control |
| C. | a programmable oscillator |
| D. | an amplifier |
| Answer» C. a programmable oscillator | |
| 14. |
Identify the diac symbol. |
| A. | a |
| B. | b |
| C. | c |
| D. | d |
| Answer» E. | |
| 15. |
You need to design a relaxation oscillator circuit. The most likely device to use might be |
| A. | an SCR. |
| B. | a UJT. |
| C. | a triac. |
| D. | a 4-layer diode. |
| Answer» C. a triac. | |
| 16. |
The silicon-controlled switch (SCS) is similar in construction to the |
| A. | triac. |
| B. | diac. |
| C. | SCR. |
| D. | 4-layer diode. |
| Answer» D. 4-layer diode. | |
| 17. |
Identify the symbol: |
| A. | SCS |
| B. | PUT |
| C. | LASCR |
| D. | diac |
| Answer» B. PUT | |
| 18. |
An application of a(n) ________ is in a lighting system for power interruptions. |
| A. | SCR |
| B. | SCS |
| C. | diac |
| D. | triac |
| Answer» B. SCS | |
| 19. |
You need a very efficient thyristor to control the speed of an AC fan motor. A good device to use would be |
| A. | a 4-layer diode. |
| B. | a PUT. |
| C. | a triac. |
| D. | a BJT. |
| Answer» D. a BJT. | |
| 20. |
The ________ can be externally programmed to turn on at a desired anode-to-gate voltage level. |
| A. | UJT |
| B. | PUT |
| C. | SCR |
| D. | SCS |
| Answer» C. SCR | |