Micro Electronics

61. The voltage gain of differential amplifier

1. Equals the AC collector resistance divided by two times the AC resistance of the emitter diode
2. Is the sum of two emitter currents
3. Equals the difference between two base currents
4. Is half of either collector current

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62. To convert a summing amplifier of an averaging amplifier

1. All inputs must be of the same value
2. The ratio of Rf/R must equal to the reciprocal of the number of inputs
3. All input resistors must be of different value
4. The ratio of RfiR must equal to the number of inputs

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63. To use a comparator for zero-level detection, the inverting input is connected to

1. Ground
2. A positive reference voltage
3. The dc supply voltage
4. A negative reference voltage

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64. Upon what principle does a relaxation oscillator operate?

1. Resistor in cascade
2. The charging and discharging of capacitor
3. The rectification process of a diode
4. Switching transistors

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65. What characteristic does not apply to an op-amp?

1. Low power
2. High gain
3. High input impedance
4. Low output impedance

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66. What has been considered as the industry standard of linear ICs?

1. 555 timer
2. 741 op amp
3. LM 340
4. LM 317

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67. What identifies the package style that houses the op amp chip?

1. Letter suffix
2. Letter prefix
3. Circuit designator
4. Military specification code

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68. What is a complete electronic circuit, containing transistors, diodes, resistors and capacitors processed on and contained entirely within a single chip of silicon?

1. Integrated circuit (IC)
2. Monolithic IC
3. Linear IC
4. Digital IC

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69. What is the absolute maximum rating for an op-amps differential input voltage?

1. ±10 V
2. ±20 V
3. ±30 V
4. ±50 V

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70. What is the approximate short circuit current output of 741 op amp?

1. 15 mA
2. 25 mA
3. 30 mA
4. 35 mA

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