Q1.The cross section of a JFET is shown in the following figure. Let Vc be -2
V and let VP be the initial pinch -off voltage. If the width W is doubled (with
other geometrical parameters and doping levels remaining the same), then the
ratio between the mutual trans conductances of the initial and the modified
JFET is
Q2.Consider the following assertions.
S1 : For Zener effect to occur, a very abrupt junction is required.
S2 : For quantum tunneling to occur, a very narrow energy barrier is required.
Which of the following is correct ?
Answer : Option AExplaination / Solution: No Explaination.
Q3.A fully charged mobile phone with a 12 V battery is good for a 10 minute talktime. Assume that, during the talk-time the battery delivers a constant current of 2 A and its voltage drops linearly from 12 V to 10 V as shown in the figure. How much energy does the battery deliver during this talk-time?
Answer : Option CExplaination / Solution:
The energy delivered in 10 minutes is
Q5.At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon n-channel MOSFET is
Answer : Option AExplaination / Solution:
At room temperature mobility of electrons for Si sample is given μn = 1350 cm2/V-s For an n-channel MOSFET to create an inversion layer of electrons, a large positive gate voltage is to be applied. Therefore, induced electric field increases and mobility decreases.
So, Mobility μn <1350 cm2/V-s for n-channel MOSFET
The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed to be short at signal frequency and effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is true
Answer : Option AExplaination / Solution:
The equivalent circuit of given amplifier circuit (when CE is connected, RE is short-circuited)
For a N -point FET algorithm N = 2m which one of the following statements is TRUE ?
Answer : Option DExplaination / Solution:
For an N-point FET algorithm butterfly operates on one pair of samples and involves two complex addition and one complex multiplication.
In a uniformly doped BJT, assume that NE, NB and NC are the emitter, base and collector doping in atoms/cm3, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following condition is TRUE
Answer : Option BExplaination / Solution:
Emitter injection efficiency is given as
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0