Industrial Electronics

21. An SCR is a member of what family?

1. Thyrector
2. Thyratron
3. Thyristor
4. Transistor

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22. An SCR is a solid state equivalent of which tube?

1. Triode
2. Gas-filled triode
3. Pentode
4. Tetrode

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23. An SCR is made of silicon and not germanium because silicon.

1. is inexpensive
2. has low leakage current
3. is mechanically strong
4. is tetravalent

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24. An SCR is made of what material?

1. Silicon
2. Carbon
3. Germanium
4. Gallium-arsenide

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25. An SCR when turned on has a typical voltage across of

1. zero
2. 0.1 V
3. infinite
4. 1 V

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26. An SCR whose state is controlled by the light falling upon a silicon semiconductor layer of the device.

1. SCS
2. GTO
3. Thyristor
4. LASCR

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27. Control system that maintains a speed voltage, or other variable within specified limits of a preset level.

1. Controller
2. Regulator
3. Sensor
4. Computer

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28. ECG stands for electrocardiography while EEG stands for?

1. electroextracellugraphy
2. electroemyography
3. electroencephalography
4. electrovectorcardiography

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29. How many pn junction does SCRs have?

1. Two
2. Four
3. Three
4. Five

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30. How many semiconductor layers does a triac have?

1. Two
2. Four
3. Three
4. One

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