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- Question
The silicon-controlled rectifier (SCR) is a three-layer device consisting of a gate, an anode, and a cathode.
Options- A. True
- B. False
- Correct Answer
- False
ExplanationA silicon-controlled rectifier (or semiconductor-controlled rectifier) is a four-layer solid state device that controls current. The name "silicon controlled rectifier" or SCR is General Electric's trade name for a type of thyristor. The SCR was developed by a team of power engineers led by Gordon Hall and commercialized by Frank W. "Bill" Gutzwiller in 1957. - 1. The 555 timer can be used in which of the following configurations?
Options- A. astable, monostable
- B. monostable, bistable
- C. astable, toggled
- D. bistable, tristable Discuss
- 2. For an S-R flip-flop to be SET or RESET, the respective input must be __________.
Options- A. LOW
- B. HIGH
- C. installed with steering diodes
- D. in parallel with a limiting resistor Discuss
- 3. Totem pole outputs _________ be connected __________ because ____________.
Options- A. can, in parallel, sometimes higher current is required
- B. cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
- C. should, in series, certain applications may require higher output voltage
- D. can, together, together they can handle larger load currents and higher output voltages Discuss
- 4. If the bandwidth of an RC low-pass filter is 20 kHz, the cutoff frequency is also 20 kHz.
Options- A. True
- B. False Discuss
- 5. A(n) ________________ is the time it takes a microprocessor to fetch and execute a complete instruction.
Options- A. instruction cycle
- B. machine cycle
- C. timing cycle
- D. write cycle Discuss
- 6. The number of bits in a digital word determines the number of digital combinations that will be represented. The number of combinations can be calculated by ________.
Options- A. raising 2 to the number of bits in the analog word
- B. raising 2 to the number of bits in the digital word
- C. multiplying 2 by the number of bits in the analog word
- D. determining the range of the analog word Discuss
- 7. The general function of a decoder is to activate one or more circuit outputs upon detection of a particular digital state.
Options- A. True
- B. False Discuss
- 8. The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:
Options- A. the ratio of the input resistance to the feedback resistance
- B. the open-loop voltage gain Aol
- C. the feedback resistance divided by the input resistance
- D. the input resistance Discuss
- 9. To find the total capacitance of capacitors in parallel, sum the values of the individual capacitors.
Options- A. True
- B. False Discuss
- 10. What is the applied voltage for a series RLC circuit when IT = 3 mA, VL = 30 V, VC = 18 V, and R = 1000 ohms?
Options- A. 3.00 V
- B. 12.37 V
- C. 34.98 V
- D. 48.00 V Discuss
More questions
Correct Answer: astable, monostable
Correct Answer: HIGH
Correct Answer: cannot, together, if the outputs are in opposite states excessively high currents can damage one or both devices
Correct Answer: True
Correct Answer: instruction cycle
Correct Answer: raising 2 to the number of bits in the digital word
Correct Answer: True
Correct Answer: the feedback resistance divided by the input resistance
Correct Answer: True
Correct Answer: 12.37 V
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