Solid State Devices

261. When both emitter and collector junctions are reverse biased, the transistor is said to be at _________ region.

  1. Active
  2. Cut-off
  3. Saturation
  4. Amplifying

Correct answer: (B)
Cut-off

262. When charges are forced to move by the electric field of a potential difference, _________ current is said to flow.

  1. Reverse
  2. Drift
  3. Leakage
  4. Threshold

Correct answer: (B)
Drift

263. When doping increases, _________ of a semiconductor decreases.

  1. Impurity
  2. Conductivity
  3. Bulk resistance
  4. Minority carrier

Correct answer: (C)
Bulk resistance

264. When PN junction is connected to a battery in such a way that P-side is connected to negative terminal of the battery and positive terminal to N-side, this connections is known as

  1. Forward bias
  2. Reverse bias
  3. Depletion connection
  4. Positive bias

Correct answer: (B)
Reverse bias

265. When PN junction is connected to a battery in such a way that P-side is connected to positive terminal of the battery and negative terminal to N-side, this connections is known as

  1. Forward bias
  2. Reverse bias
  3. Back bias
  4. Knee bias

Correct answer: (A)
Forward bias

266. When temperature increases, barrier potential _________

  1. Remains the same
  2. Decreases
  3. Increases
  4. Either increases or decreases depending on the semiconductor material used

Correct answer: (B)
Decreases

267. When temperature of a pure semiconductor is increased, its resistance

  1. Decreases
  2. Remains the same
  3. Increases
  4. Cannot be estimated

Correct answer: (A)
Decreases

268. When the collector current Ic is plotted against the collector base voltage at constant emitter Ie, the curve obtain is called

  1. Output characteristic curve
  2. Linear curve
  3. V-I curve
  4. Semilog curve

Correct answer: (A)
Output characteristic curve

269. When the electron transmit time through the base region is very short, this

  1. Creates a higher potential barrier
  2. Makes the transistor unable to amplify its signal
  3. Provides higher cut-off frequency
  4. Provides a zener effect

Correct answer: (C)
Provides higher cut-off frequency

270. When the emitter junction is forward biased while the collector junction is reverse biased, the transistor is at _________ region.

  1. Cut-off
  2. Saturation
  3. Active
  4. Breakdown

Correct answer: (C)
Active

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