MCQOPTIONS
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MCQOPTIONS
This section includes 252 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
What is the value of trans conductance? |
| A. | 1 |
| B. | 2 c) 0.1 |
| C. | d) 0.01 |
| Answer» D. | |
| 152. |
What is trans-conductance? |
| A. | ratio of change in drain current to change in collector current |
| B. | ratio of change in drain current to change in gate to source voltage |
| C. | ratio of change in collector current to change in drain current |
| D. | ratio of change in collector current to change in gate to source voltage |
| Answer» C. ratio of change in collector current to change in drain current | |
| 153. |
Determine the voltage gain for the given circuit known that R1 = R3 = 10kΩ abd R2 = R4 = 100kΩ. |
| A. | 1 |
| B. | 10 c) 100 d) 1000 |
| Answer» C. | |
| 154. |
Determine Ad and Ac for the given circuit. |
| A. | ac = 0 and ad = 1 |
| B. | ac ≠0 and ad = 1 |
| C. | ac = 0 and ad ≠1 |
| D. | ac ≠0 and ad ≠1 |
| Answer» B. ac ≠0 and ad = 1 | |
| 155. |
For the circuit shown below express v0 as a function of v1 and v2. |
| A. | v0 = v1 + v2 |
| B. | v0 = v2 – v1 |
| C. | v0 = v1 – v2 d) v0 = -v1 – v2 |
| Answer» C. v0 = v1 – v2 d) v0 = -v1 – v2 | |
| 156. |
For the difference amplifier which of the following is true? |
| A. | it responds to the difference between the two signals and rejects the signal that are common to both the signal |
| B. | it responds to the signal that are common to the two inputs only |
| C. | it has a low value of input resistance |
| D. | the efficacy of the amplifier is measured by the degree of its differential signal to the preference of the common mode signal |
| Answer» B. it responds to the signal that are common to the two inputs only | |
| 157. |
The problem with the single operational difference amplifier is its |
| A. | high input resistance |
| B. | low input resistance |
| C. | low output resistance |
| D. | none of the mentioned |
| Answer» C. low output resistance | |
| 158. |
In a Single Input Balanced Output Differential amplifier, given VCC=15v, RE = 3.9kΩ, VCE=2.4 v and re=250Ω. Determine Voltage gain |
| A. | 26 |
| B. | 56 |
| C. | 38 |
| D. | 61 |
| Answer» B. 56 | |
| 159. |
Find IC, given VCE=0.77v, VCC=10v, VBE=0.37v and RC=2.4kΩ in Dual Input Balanced Output differential amplifier |
| A. | 0.4ma |
| B. | 0.4a |
| C. | 4ma |
| D. | b) d) 4a |
| Answer» D. b) d) 4a | |
| 160. |
In ideal Differential Amplifier, if same signal is given to both inputs, then output will be |
| A. | same as input |
| B. | double the input |
| C. | not equal to zero |
| D. | zero |
| Answer» E. | |
| 161. |
Obtain the collector voltage, for collector resistor (RC) =5.6kΩ, IE=1.664mA and VCC=10v for single input unbalanced output differential amplifier |
| A. | 0.987v |
| B. | 0.682v c) 0.555v |
| C. | d) none of the mentioned |
| Answer» C. d) none of the mentioned | |
| 162. |
A differential amplifier is capable of amplifying |
| A. | dc input signal only |
| B. | ac input signal only |
| C. | ac & dc input signal |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 163. |
If output is measured between two collectors of transistors, then the Differential amplifier with two input signal is said to be configured as |
| A. | dual input balanced output |
| B. | dual input unbalanced output |
| C. | single input balanced output |
| D. | dual input unbalanced output |
| Answer» B. dual input unbalanced output | |
| 164. |
A Differential Amplifier should have collector resistor’s value (RC1 & RC2) as |
| A. | 5kΩ, 5kΩ |
| B. | 5Ω, 10kΩ |
| C. | 5Ω, 5kΩ |
| D. | 5kΩ, 10kΩ |
| Answer» B. 5Ω, 10kΩ | |
| 165. |
A Differential Amplifier amplifies |
| A. | input signal with higher voltage |
| B. | input voltage with smaller voltage |
| C. | sum of the input voltage |
| D. | none of the mentioned |
| Answer» E. | |
| 166. |
In the given circuit, hfe = 50 and hie = 1000Ω, find overall input and output resistance. |
| A. | ri=956Ω, ro=1.6 kΩ |
| B. | ri=956 kΩ, ro=2 kΩ |
| C. | ri=956 Ω, ro=2 kΩ |
| D. | ri=900Ω, ro=10 kΩ |
| Answer» D. ri=900Ω, ro=10 kΩ | |
| 167. |
1, α2 = 1.5 what is the transconductance of the entire network? |
| A. | 80 mΩ-1 |
| B. | 75 mΩ-1 |
| C. | 33 mΩ-1 |
| D. | 55 mΩ-1 |
| Answer» E. | |
| 168. |
What is a cascode amplifier? |
| A. | a cascade of two ce amplifiers |
| B. | a cascade of two cb amplifiers |
| C. | a cascade of ce and cb amplifiers |
| D. | a cascade of cb and cc amplifiers |
| Answer» D. a cascade of cb and cc amplifiers | |
| 169. |
Consider a Darlington amplifier. In the self bias network, the biasing resistances are 220kΩ and 400 kΩ. What can be the correct value of input resistance if hfe=50 and emitter resistance = 10kΩ. |
| A. | 141 kΩ |
| B. | 15 mΩ |
| C. | 20 mΩ |
| D. | 200 kΩ |
| Answer» B. 15 mΩ | |
| 170. |
What is the need for bootstrap biasing? |
| A. | to prevent a decrease in the gain of network |
| B. | to prevent an increase in the input resistance due to the biasing network |
| C. | to prevent a decrease in the input resistance due to the presence of multiple bjt amplifiers |
| D. | to prevent a decrease in the input resistance due to the biasing network |
| Answer» C. to prevent a decrease in the input resistance due to the presence of multiple bjt amplifiers | |
| 171. |
In a Darlington pair, the overall β=15000.β1=100. Calculate the collector current for Q2 given base current for Q1 is 20 μA. |
| A. | 300 ma |
| B. | 298 ma |
| C. | 2 ma |
| D. | 200ma |
| Answer» C. 2 ma | |
| 172. |
Which of these are incorrect about Darlington amplifier? |
| A. | it has a high input resistance |
| B. | the output resistance is low |
| C. | it has a unity voltage gain |
| D. | it is a current buffer |
| Answer» E. | |
| 173. |
The transconductance of a B.J.T.is 5mS (gm) while a 2KΩ (Rl) load resistance is connected to the C.E. stage. Neglecting Early effect, what is the Miller multiplication factor for the input side? |
| A. | 21 |
| B. | 11 |
| C. | 20 |
| Answer» C. 20 | |
| 174. |
If 1/h12 = 4, for a C.E. stage- what is the value of the base to collector capacitance, after Miller multiplication, at the input side? |
| A. | 4cµ |
| B. | 5cµ |
| C. | 6cµ d) 1.1cµ |
| Answer» D. | |
| 175. |
If the B.J.T. is used as a follower, which capacitor experiences Miller multiplication? |
| A. | cπ |
| B. | cµ |
| C. | ccs |
| D. | cb |
| Answer» B. cµ | |
| 176. |
In a simple follower stage, C2 is a parasitic capacitance arising due to the depletion region between the collector and the substrate. What is the value of C2? |
| A. | 0 |
| B. | infinite |
| C. | ccs |
| D. | 2*ccs |
| Answer» B. infinite | |
| 177. |
For a cascode stage, with input applied to the C.B. stage, the input capacitance gets multiplied by a factor of |
| A. | 0 |
| B. | 1 |
| C. | 3 |
| D. | 2 |
| Answer» E. | |
| 178. |
Ignoring early effect, if C1 is the total capacitance tied to the emitter, what is the input pole of a simple C.B. stage? |
| A. | 1/gm * c1 |
| B. | 2/gm * c1 |
| C. | gm * c1 |
| D. | gm * 2c1 |
| Answer» B. 2/gm * c1 | |
| 179. |
During high frequency applications of a B.J.T., which of the following three stages do not get affected by Miller’s approximation? |
| A. | c.e. |
| B. | c.b. |
| C. | c.c. |
| D. | follower |
| Answer» C. c.c. | |
| 180. |
In CE arrangement, the value of input impedance is approximately equal to |
| A. | hie |
| B. | hib |
| C. | hoe |
| D. | hre |
| Answer» B. hib | |
| 181. |
How many h-parameters of a transistor are dimensionless? |
| A. | four |
| B. | two |
| C. | three |
| D. | one |
| Answer» C. three | |
| 182. |
The values of h-parameters of a transistor in CE arrangement are                  arrangement. |
| A. | same as for cb |
| B. | same as for cc |
| C. | different from that in cb |
| D. | similar to no |
| Answer» D. similar to no | |
| 183. |
If the load resistance of a C.E. stage increases by a factor of 2, what happens to the high frequency response? |
| A. | the 3 db roll off occurs faster |
| B. | the 3 db roll off occurs later |
| C. | the input pole shifts towards origin |
| D. | the input pole becomes infinite |
| Answer» B. the 3 db roll off occurs later | |
| 184. |
If temperature changes, h parameters of a transistor |
| A. | also change |
| B. | does not change |
| C. | remains same |
| D. | may or may not change |
| Answer» B. does not change | |
| 185. |
The hfe parameter is called                in CE arrangement with output short circuited. |
| A. | voltage gain |
| B. | current gain |
| C. | input impedance |
| D. | output impedance |
| Answer» C. input impedance | |
| 186. |
What happens to the h parameters of a transistor when the operating point of the transistor changes? |
| A. | it also changes |
| B. | does not change |
| C. | may or may not change |
| D. | nothing happens |
| Answer» B. does not change | |
| 187. |
The dimensions of hie parameters are |
| A. | mho |
| B. | ohm |
| C. | farad |
| D. | ampere |
| Answer» C. farad | |
| 188. |
How many h-parameters are there for a transistor? |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» D. five | |
| 189. |
For what type of signals does a transistor behaves as linear device? |
| A. | small signals only |
| B. | large signals only |
| C. | both large and small signal |
| D. | no signal |
| Answer» B. large signals only | |
| 190. |
What is the current flowing through the R1 resistor for voltage divider (R1=R2=1KΩ, VDD=10V)? |
| A. | 5ma |
| B. | 3ma |
| C. | 1ma |
| D. | 2ma |
| Answer» B. 3ma | |
| 191. |
The h-parameters analysis gives correct results for |
| A. | large signals only |
| B. | small signals only |
| C. | both large and small |
| D. | not large nor small signals |
| Answer» C. both large and small | |
| 192. |
What will happen if values of Rs increase? |
| A. | vgs increases |
| B. | vgs decreases |
| C. | vgs remains the same |
| D. | vgs=0 |
| Answer» C. vgs remains the same | |
| 193. |
Find the gate to source voltage for voltage divider having R1=R2=2KΩ and VDD=12V, ID=1mA and RS=4KΩ? |
| A. | 3v |
| B. | 2v |
| C. | 0v |
| D. | 1v |
| Answer» C. 0v | |
| 194. |
Find the gate voltage for voltage divider having R1=R2=1KΩ and VDD=5V? |
| A. | 1v |
| B. | 5v |
| C. | 3v |
| D. | 2.5v |
| Answer» E. | |
| 195. |
For a self-bias circuit, find drain to source voltage if VDD=12V, ID=1mA, Rs=RD=1KΩ? |
| A. | 1v |
| B. | 2v |
| C. | 10v |
| D. | 5v |
| Answer» D. 5v | |
| 196. |
Which of the following equation brings the relation between gate to source voltage and drain current in Self Bias? |
| A. | vgs=vdd |
| B. | vgs=-id rs |
| C. | vgs=0 |
| D. | vgs=1+id rs |
| Answer» C. vgs=0 | |
| 197. |
For a fixed bias circuit the drain current was 1mA, VDD=12V, determine drain resistance required if VDS=10V? |
| A. | 1kΩ |
| B. | 1.5kΩ |
| C. | 2kΩ |
| D. | 4kΩ |
| Answer» D. 4kΩ | |
| 198. |
For a fixed bias circuit the drain current was 1mA, what is the value of source current? |
| A. | 0ma |
| B. | 1ma |
| C. | 2ma |
| D. | 3ma |
| Answer» D. 3ma | |
| 199. |
Which of the following relation is true about gate current? |
| A. | ig=id+is |
| B. | id=ig |
| C. | is= ig |
| D. | ig=0 |
| Answer» E. | |
| 200. |
Consider the following circuit. Given that VDD = 15V, VP = 2V, and IDS = 3mA, to bias the circuit properly, select the proper statement. |
| A. | rd < 6kΩ |
| B. | rd > 6kΩ |
| C. | rd > 4kΩ |
| D. | rd < 4kΩ |
| Answer» B. rd > 6kΩ | |