List of top Electronics and Communication Engineering Questions

Arrange the steps of classic 4-stage instruction pipelining: A. Execute B. Fetch C. Write-back D. Decode

Consider the statements given below: A. Discrete-time LTI system with impulse response $h[n] = \left(\frac{1}{2}\right)^n u[n-1]$ is causal B. Response $(-2)^n u[n]$ may or may not be stable C. Response $(-2)^n u[n]$ is unstable D. Response $(-2)^n u[-n-1]$ is unstable

The general solution of the differential equation $y'' + 4y' + 4y = 0$ is:

Evaluate: $\lim_{x \to 0} \frac{e^{3x}+x^2}{3x-5x^2}$}

Assertion (A): Skin depth is the depth by which electromagnetic wave is attenuated to $1/e$ of its original value. Reason (R): Depth of penetration decreases with increasing wavelength.

A minimum phase unity feedback system has slope $-20\,dB/decade$ for all frequencies. The value of maximum phase margin is:

If a $3 \times 3$ matrix $A$ has eigenvalues $2, 3, -4$, find $\det(A)$.

Assertion (A): All stereo broadcasting uses quadrature carrier multiplexing (QAM). Reason (R): QAM involves more stringent synchronization than FM system with 558 subcarrier modulation.

Consider the following flags of 8085 affected by the instruction SUB B: A. Sign flag B. Carry flag C. Zero flag D. Parity flag

Arrange the following modulation schemes in increasing order of bits/symbol: A. 16-QAM B. 8-PSK C. QPSK D. BPSK

Consider the following statements: A. The intrinsic concentration of carriers is independent of temperature B. Current due to carrier drift occurs in both semiconductor and metals C. Current due to carrier diffusion exists in both semiconductor and metals D. Metals are unipolar while semiconductors have bipolar nature

In a superheterodyne receiver arrange the following components sequentially from input to output: A. Antenna B. Mixer C. IF amplifier D. Audio amplifier

Assertion (A): Gallium arsenide is a direct band semiconductor having faster switching capabilities and high temperature operating capabilities. Reason (R): A substance for which the forbidden energy region is relatively small is called a semiconductor.

Which of the following theorems are used to simplify a linear circuit into an equivalent form with a single source and impedance? A. Thevenin's theorem B. Norton's theorem C. Superposition theorem D. Reciprocity theorem

Carson’s rule for estimating the bandwidth (B) of an FM signal is:

Assertion (A): 8-bit PCM system performs better than 4-bit PCM system. Reason (R): 8-bit system produces smaller quantization noise than 4-bit system.

The steady-state error of a Type 1 system for a unit step input is:

Assertion (A): A network in which circuit elements like resistance, inductance and capacitance cannot be physically separated or analysis purpose is called lumped network. Reason (R): Most of the electric network are lumped in nature.

Which of the following are listed as types of compensators for system design? A. Lead compensators B. Stepper motors C. Lag compensators D. Servo valves

For maximum power transfer in an AC circuit, the load impedance $Z_L$ should be:

Assertion (A): The ability of a differential amplifier to reject a differential mode signal is called its figure of merit. Reason (R): The ideal value of figure of merit of a differential amplifier is infinite.

For an Op-amp, CMRR = $10^5$ and differential gain = $10^6$, what is the common mode gain of the Op-amp?

The signal $x(t) = A\cos(\omega t + \phi)$ is: