Industrial Electronics

91. Which equation defines the intrinsic stand off ratio (ri) of UJTs?

1. RB1 / (RB1 + RB2)
2. (RB1 + RB2) / RB1
3. (RB1 + RB2) / RB2
4. RB1 + RB2

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92. Which is equivalent to a zener or avalanche region of the fundamental two-layer semiconductor diode?

1. Reverse breakdown voltage
2. Forward breakdown voltage
3. Breakdown voltage
4. Breakover voltage

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93. Which is the control element in an SCR?

1. Anode
2. Cathode
3. Gate
4. Cathode supply

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94. Which of the following can change the angle of conduction in SCR?

1. Changing anode voltage
2. Changing gate voltage
3. Reverse biasing the gate
4. Changing cathode voltage

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95. Which of the following is a common application of UJT?

1. Amplifier
2. Rectifier
3. Mulitivibrator
4. Sawtooth generator

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96. Which of the following is a four-layer diode with an anode gate and a cathode gate?

1. SCS
2. SCR
3. SBS
4. SUS

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97. Which of the following is NOT a method primarily used for density sensing?

1. Sonic
2. Radiations
3. Vibrating element
4. Differential

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98. Which of the following is the normal way to turn on a diac?

1. By breakover voltage
2. By gate voltage
3. By gate current
4. By anode current

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99. Which of the following is the normal way to turn on an SCR?

1. By breakover voltage
2. By appropriate anode current
3. By appropriate cathode current
4. By appropriate gate current

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100. Which transistor conducts current in both directions when turned on?

1. Diac
2. SCR
3. Quadrac
4. SCS

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