Micro Electronics

21. For most commercial and industrial operations, ICs are tested in the temperature range of

  1. 0°C to +70 °C
  2. -55 °C to +125 °C
  3. -173 °C to + 100 °C
  4. -10 °C to + 25 °C

Correct answer: (A)
0°C to +70 °C

22. How is the output of a differentiator related to the input in an op-amp?

  1. The output of a differentiator is proportional to the rate of change of the input
  2. The output of a differentiator is inversely proportional to the rate of change of the input
  3. The two parameters are not related
  4. The two parameters are always equal to each other

Correct answer: (A)
The output of a differentiator is proportional to the rate of change of the input

23. ICs for military and space applications are tested in the temperature range of

  1. 0°C to +70 °C
  2. -55 °C to +125 °C
  3. -173 °C to + 100 °C
  4. -10 °C to + 25 °C

Correct answer: (B)
-55 °C to +125 °C

24. ICs have advantages over discrete device circuits which is

  1. Lower cost
  2. High reliability
  3. Smaller size
  4. All of the above

Correct answer: (D)
All of the above

25. If the base 10 is called decimal number system, then the base 12 is called

  1. Bidecimal number system
  2. Dodecimal number system
  3. Duodecimal number system
  4. All of the above

Correct answer: (C)
Duodecimal number system

26. In a 5 V level detector circuit

  1. The noninverting input is connected to +5V
  2. The input signal is connected to +5V
  3. The inverting input is connected to +5V
  4. The input signal must be riding on a +5V dc level

Correct answer: (C)
The inverting input is connected to +5V

27. In an op-amp integrator, the feedback path consist of

  1. A capacitor
  2. An inductor
  3. A resistor and a capacitor in series
  4. A resistor and a capacitor in parallel

Correct answer: (A)
A capacitor

28. In IC op-amps, one of the most important input characteristics is the __________ which is defined as the difference between the base currents.

  1. Input bias current
  2. Input offset current
  3. Total base current
  4. All of the choices

Correct answer: (B)
Input offset current

29. In IC op-amps, the input bias current is defined as the

  1. Average of the two base currents
  2. Total of the base currents
  3. Inverse of the base currents
  4. Difference of the base currents

Correct answer: (A)
Average of the two base currents

30. In most modern IC op-amps, the 741 requires __________ power supplies

  1. 1
  2. 2
  3. 3
  4. 4

Correct answer: (B)
2

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