Choose the most appropriate word from the options given below to complete the following sentence:
His rather casual remarks on politics ___ his lack of seriousness about the subject

**A. ** masked

**B. ** belled

**C. ** betrayed

**D. ** suppressed

**Answer : ****Option C**

**Explaination / Solution: **

Betrayed means reveal unintentionally that is most appropriate.

Betrayed means reveal unintentionally that is most appropriate.

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Given digits 2, 2, 3, 3, 4, 4, 4 how many distinct 4 digit numbers greater than 3000 can be formed

**A. ** 50

**B. ** 51

**C. ** 52

**D. ** 54

**Answer : ****Option B**

**Explaination / Solution: **

No Explaination.

No Explaination.

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Assuming that the flip-flop are in reset condition initially, the count sequence observed at Q_{A}, in the circuit shown is

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At room temperature, a possible value for the mobility of electrons in the inversion layer of a silicon n-channel MOSFET is

**A. **
**B. ** 1359 cm2/V-s
**C. ** 1800 cm2/V-s
**D. ** 3600 cm2/V-s
**Answer : ****Option A**

**Explaination / Solution: **

450 cm^{2}/V-s

At room temperature mobility of electrons for Si sample is given μ_{n = }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

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In a uniformly doped BJT, assume that N_{E}, NB and NC are the emitter, base and collector doping in atoms/cm^{3}, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following condition is TRUE

Emitter injection efficiency is given as

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If the scattering matrix [S ] of a two port network is then the network is

**A. ** lossless and reciprocal

**B. ** lossless but not reciprocal

**C. ** not lossless but reciprocal

**D. ** neither lossless nor reciprocal

**Answer : ****Option C**

**Explaination / Solution: **

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Consider a baseband binary PAM receiver shown below. The additive channel noise n(t) is with power spectral density The lowpass filter is ideal with unity gain and cut-off frequency 1 MHz. Let Yk represent the random variable y(tk).

Yk = Nk , if transmitted bit bk = 0

Yk = a + Nk if transmitted bit bk = 1

Where Nk represents the noise sample value. The noise sample has a probability density function, (This has mean zero and variance 2/α^{2}). Assume transmitted bits to be equiprobable and threshold z is set to a/2
= 10^{-6} V.

The value of the parameter α
(in V^{-1}) is

Let response of LPF filters

Noise variance (power) is given as

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The residues of a complex function at its poles are

**A. ** 1/2, -1/2 and 1

**B. ** 1/2, -1/2 and -1

**C. ** 1/2, -1 and 3/2

**D. ** 1/2, -1 and 3/2

**Answer : ****Option C**

**Explaination / Solution: **

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Two discrete time system with impulse response h1[n] = 𝛿[n - 1] and h2[n] = 𝛿[n - 2] are connected in cascade. The overall impulse response of the cascaded system is

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The silicon sample with unit cross-sectional area shown below is in thermal equilibrium. The following information is given: T = 300 K electronic charge = 1.6 × 10^{-19} C, thermal voltage = 26 mV and electron mobility = 1350 cm^{2} / V-s

The magnitude of the electric field at x = 0.5 μm is

No Explaination.

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