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MCQOPTIONS
This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
For a common-emitter amplifier, the purpose of swamping is |
| A. | to minimize gain. |
| B. | to reduce the effects of r' |
| C. | <sub>e</sub> |
| D. | to maximize gain. |
| E. | no purpose. |
| Answer» C. <sub>e</sub> | |
| 152. |
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 | |
| 153. |
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. | |
| 154. |
For the common-emitter amplifier ac equivalent circuit, all capacitors are |
| A. | effectively shorts. |
| B. | effectively open circuits. |
| C. | not connected to ground. |
| D. | connected to ground. |
| Answer» B. effectively open circuits. | |
| 155. |
When the bypass capacitor is removed from a common-emitter amplifier, the voltage gain |
| A. | increases. |
| B. | decreases. |
| C. | has very little effect. |
| Answer» C. has very little effect. | |
| 156. |
Refer to this figure. Determine the value of VC. |
| A. | 20 V |
| B. | 10 V |
| C. | 5 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 157. |
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 | |
| 158. |
The current gain for the Darlington connection is ________. |
| A. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca05_0360a.gif"> |
| B. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca05_0360b.gif"> |
| C. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca05_0360c.gif"> |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/mca05_0360d.gif"> |
| Answer» C. <img src="/_files/images/electronic-devices-and-circuit-theory/mca05_0360c.gif"> | |
| 159. |
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 | |
| 160. |
Refer to this figure. Find the value of IE. |
| A. | 2 mA |
| B. | 4 mA |
| C. | 5 mA |
| D. | 6 mA |
| Answer» E. | |
| 161. |
For the BJT to operate in the saturation region, the base-emitter junction must be ________-biased and the base-collector junction must be ________-biased. |
| A. | forward, forward |
| B. | forward, reverse |
| C. | reverse, reverse |
| D. | reverse, forward |
| Answer» B. forward, reverse | |
| 162. |
Calculate ICsat. |
| A. | 35.29 mA |
| B. | 5.45 mA |
| C. | 1.86 mA |
| D. | 4.72 mA |
| Answer» E. | |
| 163. |
Calculate the storage time in a transistor switching network if toff is 56 ns, tf = 14 ns, and tr = 20 ns. |
| A. | 70 ns |
| B. | 42 ns |
| C. | 36 ns |
| D. | 34 ns |
| Answer» C. 36 ns | |
| 164. |
Calculate the voltage across the 91 k resistor. |
| A. | 18 V |
| B. | 9.22 V |
| C. | 3.23 V |
| D. | None of the above |
| Answer» D. None of the above | |
| 165. |
Calculate the value of VCEQ. |
| A. | 8.78 V |
| B. | 0 V |
| C. | 7.86 V |
| D. | 18 V |
| Answer» D. 18 V | |
| 166. |
For what value of does the transistor enter the saturation region? |
| A. | 20 |
| B. | 50 |
| C. | 75 |
| D. | 116 |
| Answer» E. | |
| 167. |
Which of the following is (are) the application(s) of a transistor? |
| A. | Amplification of signal |
| B. | Switching and control |
| C. | Computer logic circuitry |
| D. | All of the above |
| Answer» E. | |
| 168. |
The total time required for the transistor to switch from the "off" to the "on" state is designated as ton and defined as the delay time plus the time element. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 169. |
Determine the current through each diode if E1 = E2 = 0 V. |
| A. | 4.65 mA |
| B. | 9.3 mA |
| C. | 18.6 mA |
| D. | 0.7 mA |
| Answer» B. 9.3 mA | |
| 170. |
Refer to the figure given below. If the voltmeter across the transformer reads 0 V, the probable trouble, if any, would be |
| A. | one of the diodes is open. |
| B. | a diode is shorted. |
| C. | an open transformer secondary. |
| D. | the filter capacitor is shorted. |
| E. | no trouble exists. |
| Answer» D. the filter capacitor is shorted. | |
| 171. |
The output frequency of a half-wave rectifier is ________ the input frequency. |
| A. | one-half |
| B. | twice |
| C. | equal to |
| D. | none of the above |
| Answer» D. none of the above | |
| 172. |
A diode is in the "________" state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and VD 0.7 V for Si and VD 0.3 V for Ge. |
| A. | off |
| B. | on |
| C. | neutral |
| D. | quiescent |
| Answer» C. neutral | |
| 173. |
What best describes the circuit? |
| A. | Full-wave rectifier |
| B. | Half-wave rectifier |
| C. | Clipper |
| D. | Clamper |
| Answer» D. Clamper | |
| 174. |
Determine the voltage across the resistor. |
| A. | 0 V |
| B. | 0.09 V |
| C. | 0.2 V |
| D. | 0.44 V |
| Answer» B. 0.09 V | |
| 175. |
Rectifiers are commonly used in battery chargers. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 176. |
List the categories of clippers. |
| A. | Series |
| B. | Parallel |
| C. | Series and parallel |
| D. | None of the above |
| Answer» D. None of the above | |
| 177. |
A silicon diode has a voltage to ground of 117 V from the anode. The voltage to ground from the cathode is 117.7 V. The diode is |
| A. | open. |
| B. | shorted. |
| C. | forward-biased. |
| D. | reverse-biased. |
| Answer» D. reverse-biased. | |
| 178. |
What is the logic function of this circuit? |
| A. | Positive logic AND gate |
| B. | Positive logic OR gate |
| C. | Negative logic AND gate |
| D. | Negative logic OR gate |
| Answer» C. Negative logic AND gate | |
| 179. |
Determine ID. |
| A. | 0 mA |
| B. | 1.893 mA |
| C. | 2.036 mA |
| D. | 2.143 mA |
| Answer» C. 2.036 mA | |
| 180. |
In a voltage-multiplier circuit, the number of diodes is directly proportional to the multiplicative voltage factor. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 181. |
In the operation of a half-wave rectifier with a capacitor-input filter, the ripple factor can be lowered by ________ the value of the filter capacitor or ________ the load resistors. |
| A. | decreasing, decreasing |
| B. | decreasing, increasing |
| C. | increasing, decreasing |
| D. | increasing, increasing |
| Answer» E. | |
| 182. |
Determine ID2. |
| A. | 6.061 mA |
| B. | 0.7 mA |
| C. | 3.393 mA |
| D. | 3.571 mA |
| Answer» D. 3.571 mA | |
| 183. |
A short circuit has a ________ drop across its terminals, and the current is limited only by the surrounding network. |
| A. | 5 V |
| B. | 0 V |
| C. | 1 V |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/infinity.gif"> |
| Answer» C. 1 V | |
| 184. |
Determine the peak for both half cycles of the output waveform. |
| A. | 16 V, 4 V |
| B. | 16 V, 4 V |
| C. | 16 V, 4 V |
| D. | 16 V, 4 V |
| Answer» B. 16 V, 4 V | |
| 185. |
An open circuit can have any voltage across its terminals, but the current is always ________. |
| A. | 5 A |
| B. | 0 A |
| C. | 1 A |
| D. | <img src="/_files/images/electronic-devices-and-circuit-theory/infinity.gif"> |
| Answer» C. 1 A | |
| 186. |
Determine ID1. |
| A. | 0 mA |
| B. | 29.40 mA |
| C. | 14.70 mA |
| D. | 14.09 mA |
| Answer» B. 29.40 mA | |
| 187. |
Determine ID2. |
| A. | 29.40 mA |
| B. | 30.30 mA |
| C. | 14.70 mA |
| D. | None of the above |
| Answer» D. None of the above | |
| 188. |
Determine the current level if E = 15 V and R = 3 k. |
| A. | 0 A |
| B. | 4.76 mA |
| C. | 5 mA |
| D. | 5 A |
| Answer» C. 5 mA | |
| 189. |
Determine V2. |
| A. | 3.201 V |
| B. | 0 V |
| C. | 4.3 V |
| D. | 1.371 V |
| Answer» E. | |
| 190. |
If the ac supply is 50 Hz, what will be the ripple frequency out of the full-wave rectifier? |
| A. | 50 Hz |
| B. | 60 Hz |
| C. | 100 Hz |
| D. | 120 Hz |
| Answer» D. 120 Hz | |
| 191. |
In a regulated supply, what term describes how much change occurs in the output voltage over a certain range of load current values, from minimum to maximum current? |
| A. | line regulation |
| B. | voltage regulator |
| C. | current regulator |
| D. | load regulation |
| Answer» E. | |
| 192. |
Determine the average value of the current through the load resistor. |
| A. | 2.5 mA |
| B. | 0 mA |
| C. | 1.37 mA |
| D. | 1.479 mA |
| Answer» E. | |
| 193. |
What best describes the circuit? |
| A. | Full-wave rectifier |
| B. | Half-wave rectifier |
| C. | Clipper |
| D. | Clamper |
| Answer» B. Half-wave rectifier | |
| 194. |
Refer to this figure. If an emitter bypass capacitor was installed, what would the new Av be? |
| A. | 4.96 |
| B. | 125 |
| C. | 398 |
| D. | 600 |
| Answer» E. | |
| 195. |
A Darlington pair provides beta ________ for ________ input resistance. |
| A. | multiplication, decreased |
| B. | multiplication, increased |
| C. | division, decreased |
| Answer» C. division, decreased | |
| 196. |
Which of the following configurations has a voltage gain of RC /re? |
| A. | Fixed-bias common-emitter |
| B. | Common-emitter voltage-divider with bypass capacitor |
| C. | Fixed-bias common-emitter and voltage-divider with bypass capacitor |
| D. | Common-emitter voltage-divider without bypass capacitor |
| Answer» D. Common-emitter voltage-divider without bypass capacitor | |
| 197. |
A Darlington pair amplifier has |
| A. | high input impedance and high voltage gain. |
| B. | low input impedance and low voltage gain. |
| C. | a voltage gain of about 1 and a low input impedance. |
| D. | a low voltage gain and a high input impedance. |
| Answer» E. | |
| 198. |
Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks? |
| A. | Small-signal |
| B. | Large-signal |
| C. | Small- or large-signal |
| D. | None of the above |
| Answer» D. None of the above | |
| 199. |
The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________. |
| A. | resistive, ohms, megohms |
| B. | capacitive, microfarads, farads |
| C. | inductive, millihenrys, henrys |
| D. | None of the above |
| Answer» B. capacitive, microfarads, farads | |
| 200. |
The ________ the source resistance and/or ________ the load resistance, the less the overall gain of an amplifier. |
| A. | smaller, smaller |
| B. | smaller, larger |
| C. | larger, smaller |
| D. | larger, larger |
| Answer» D. larger, larger | |