Electronic Circuits

121. The gain of an amplifier with feedback is known as _________ gain.

1. Closed loop
2. Resonant
3. Open loop
4. Unity

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122. The general characteristics of a common base amplifier are

1. High voltage gain, low current gain, high power gain and very low input resistance
2. High voltage, high current gain, high power gain and low input resistance
3. Low voltage gain, high current gain, very high power gain and low input resistance
4. None of the choices

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123. The impedance of a load must match the impedance of the amplifier so that

1. Minimum power is transferred to the load
2. The efficiency can be maintained at low level
3. The signal-to-noise ratio is maximized
4. Maximum power is transferred to the load

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124. The input capacitor in an amplifier is called _________ capacitor.

1. Coupling
2. Stray
3. Bypass
4. Electrolytic

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125. The input impedance of an amplifier _________ when negative current feedback is applied.

1. Remains unchanged
2. Decreases
3. Increases
4. Becomes zero

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126. The input impedance of an amplifier _________ when negative voltage feedback is applied.

1. Decreases
2. Becomes zero
3. Increases
4. Is unchanged

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127. The input impedance of which amplifier depends strongly on load resistance?

1. CE
2. CC
3. CB
4. CD

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128. The input resistance of a common emitter amplifier is affected by

1. R_e, r_e and β
2. R_c and r_e
3. β and r_e
4. a and r_e

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129. The largest theoretical voltage gain obtained with a common collector amplifier is

1. 100
2. 10
3. Unity
4. Infinite

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130. The number of stages that can be directly coupled is limited because

1. Change in temperature can cause thermal instability
2. Circuit becomes heavily and costly
3. It becomes difficult to bias the circuit
4. Circuits' resistance becomes too large

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