Industrial Electronics

51. The voltage across an SCR when it is turned on is about

1. 0.5 V
2. 0.1 V
3. 1 V
4. 5 V

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52. The x-ray region of the electromagnetic spectrum has a corresponding range of wavelengths from

1. 0.1 to 0.0001 nm
2. 0.1 to 0.0001 pm
3. 0.1 to 0.0001 μm
4. 0.1 to 0.0001 mm

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53. To turn off the SCR, which of the following is done?

1. Reduce gate voltage to zero
2. Reverse bias the gate
3. Reduce anode voltage to zero
4. Reduce cathode voltage to zero

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54. To turn on the UJT, the forward bias on emitter diode should be _________ the peak point voltage.

1. more than
2. less than
3. equal to
4. twice

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55. What are some areas where GTO is applicable?

1. Counters
2. Pulse generators
3. Multivibrators
4. All of the above

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56. What are the regions corresponding to open-circuit condition for the controlled rectifier which block the flow of charge from anode to cathode?

1. Forward blocking regions
2. Reverse blocking regions
3. Breakdown regions
4. Both A and B above

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57. What device measures humidity directly with a single sensing element?

1. Hygrometer
2. Tachometer
3. Venturi meter
4. Hydrometer

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58. What Greek word which means "switch"?

1. Ristor
2. Trans
3. Thy
4. Thyristor

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59. What is a nucleonic sensing method employing usually one or more radioisotope sources and radiation detectors?

1. Radiation sensing
2. Sonic level sensing
3. Conductivity level sensing
4. Dielectric variation sensing

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60. What is a solid state equivalent of a gas filled triode?

1. Triac
2. Thyristor
3. SCR
4. SCS

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