MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 131 Mcqs, each offering curated multiple-choice questions to sharpen your Active Filter Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Refer to this figure. You notice while servicing this amplifier that the output signal at V out is reduced from normal. The problem could be caused by |
| A. | an open C 3 . |
| B. | an open C 2 . |
| C. | an open base-emitter of Q 2 . |
| D. | a shorted C 2 . |
| Answer» C. an open base-emitter of Q 2 . | |
| 102. |
When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain |
| A. | increases. |
| B. | decreases. |
| C. | has very little effect. |
| D. | - |
| Answer» C. has very little effect. | |
| 103. |
The ________ configuration is frequently used for impedance matching. |
| A. | fixed-bias |
| B. | voltage-divider bias |
| C. | emitter-follower |
| D. | collector feedback |
| Answer» D. collector feedback | |
| 104. |
Under which of the following condition(s) is the current gain ? |
| A. | r o 10R C |
| B. | R B 10r e |
| C. | r o 10R C and R B 10r e |
| D. | None of the above |
| Answer» D. None of the above | |
| 105. |
The differential amplifier produces outputs that are |
| A. | common mode. |
| B. | in-phase with the input voltages. |
| C. | the sum of the two input voltages. |
| D. | the difference of the two input voltages. |
| Answer» E. | |
| 106. |
The emitter-follower configuration has a ________ impedance at the input and a ________ impedance at the output. |
| A. | low, low |
| B. | low, high |
| C. | high, low |
| D. | high, high |
| Answer» D. high, high | |
| 107. |
The differential amplifier has |
| A. | one input and one output. |
| B. | two inputs and two outputs. |
| C. | two inputs and one output. |
| D. | one input and two outputs. |
| Answer» D. one input and two outputs. | |
| 108. |
Which of the following represent(s) the advantage(s) of the system approach over the r-model approach? |
| A. | Thevenin's theorem can be used. |
| B. | The effect of changing the load can be determined by a simple equation. |
| C. | There is no need to go back to the ac equivalent model and analyze the entire network. |
| D. | All of the above |
| Answer» E. | |
| 109. |
Which one of the following configurations has the lowest input impedance? |
| A. | Fixed-bias |
| B. | Common-base |
| C. | Emitter-follower |
| D. | Voltage-divider? |
| Answer» C. Emitter-follower | |
| 110. |
For the common-emitter fixed-bias configuration, there is a ________ phase shift between the input and output signals. |
| A. | 0º |
| B. | 45º |
| C. | 90º |
| D. | 180º |
| Answer» E. | |
| 111. |
What does the negative sign in the voltage gain of the common-emitter fixed-bias configuration indicate? |
| A. | The output and input voltages are 180º out of phase. |
| B. | Gain is smaller than 1. |
| C. | Gain is larger than 1. |
| D. | None of the above |
| Answer» B. Gain is smaller than 1. | |
| 112. |
What is the range of the current gain for BJT transistor amplifiers? |
| A. | less than 1 |
| B. | 1 to 100 |
| C. | above 100 |
| D. | All of the above |
| Answer» E. | |
| 113. |
Refer to this figure. Calculate the value of R in(tot) . |
| A. | 37.7 k |
| B. | 3.77 k |
| C. | 378 |
| D. | 2.25 k |
| Answer» C. 378 | |
| 114. |
What is the unit of the parameter h o ? |
| A. | Volt |
| B. | Ohm |
| C. | Siemen |
| D. | No unit |
| Answer» D. No unit | |
| 115. |
What is the typical range of the output impedance of a common-emitter configuration? |
| A. | 10 to 100 |
| B. | 1 k to 5 k |
| C. | 40 k to 50 k |
| D. | 500 k to 1 k |
| Answer» D. 500 k to 1 k | |
| 116. |
What is the range of the input impedance of a common-base configuration? |
| A. | A few ohms to a maximum of 50 |
| B. | 1 k to 5 k |
| C. | 100 k to 500 k |
| D. | 1 M to 2 M |
| Answer» B. 1 k to 5 k | |
| 117. |
The advantage that a Sziklai pair has over a Darlington pair is |
| A. | higher current gain. |
| B. | less input voltage is needed to turn it on. |
| C. | higher input impedance. |
| D. | higher voltage gain. |
| Answer» C. higher input impedance. | |
| 118. |
A common-emitter amplifier has ________ voltage gain, ________ current gain, ________ power gain, and ________ input impedance. |
| A. | high, low, high, low |
| B. | high, high, high, low |
| C. | high, high, high, high |
| D. | low, low, low, high |
| Answer» C. high, high, high, high | |
| 119. |
You have a need to apply an amplifier with a very high power gain. Which of the following would you choose? |
| A. | common-collector |
| B. | common-base |
| C. | common-emitter |
| D. | emitter-follower |
| Answer» D. emitter-follower | |
| 120. |
What is the voltage gain of a feedback pair connection? |
| A. | 1 |
| B. | –1 |
| C. | 100 |
| D. | –100 |
| Answer» B. –1 | |
| 121. |
Refer to this figure. Calculate the value of V B . |
| A. | 5 V |
| B. | 3.7 V |
| C. | 20 V |
| D. | 3 V |
| Answer» C. 20 V | |
| 122. |
An emitter-follower is also known as a |
| A. | common-emitter amplifier. |
| B. | common-base amplifier. |
| C. | common-collector amplifier. |
| D. | Darlington pair. |
| Answer» D. Darlington pair. | |
| 123. |
What is the typical value of the current gain of a common-base configuration? |
| A. | Less than 1 |
| B. | Between 1 and 50 |
| C. | Between 100 and 200 |
| D. | Undefined |
| Answer» B. Between 1 and 50 | |
| 124. |
What is the most important r parameter for amplifier analysis? |
| A. | r b ? |
| B. | r c ? |
| C. | r e ? |
| D. | - |
| Answer» D. - | |
| 125. |
For a common-emitter amplifier, the purpose of swamping is |
| A. | to minimize gain. |
| B. | to reduce the effects of r' e |
| C. | to maximize gain. |
| D. | no purpose. |
| Answer» C. to maximize gain. | |
| 126. |
Refer to this figure. Determine the value of A v . |
| A. | 49.6 |
| B. | 5 |
| C. | 100 |
| D. | 595 |
| Answer» C. 100 | |
| 127. |
Which of the following conditions must be met to allow the use of the approximate approach in a voltage-divider bias configuration? |
| A. | r e > 10R 2 |
| B. | R E > 10R 2 |
| C. | R E < 10R 2 |
| D. | r e < 10R 2 |
| Answer» E. | |
| 128. |
Which of the following is referred to as the reverse transfer voltage ratio? |
| A. | h i |
| B. | h r |
| C. | h f |
| D. | h o |
| Answer» C. h f | |
| 129. |
Refer to this figure. Find the value of I E . |
| A. | 2 mA |
| B. | 4 mA |
| C. | 5 mA |
| D. | 6 mA |
| Answer» E. | |
| 130. |
Which of the h-parameters corresponds to r e in a common-base configuration? |
| A. | h ib |
| B. | h fb |
| C. | h rb |
| D. | h ob |
| Answer» B. h fb | |
| 131. |
Which of the following configurations has the lowest output impedance? |
| A. | Fixed-bias |
| B. | Voltage-divider |
| C. | Emitter-follower |
| D. | None of the above |
| Answer» D. None of the above | |