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

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 $\det(A)$.

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

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

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

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

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

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.

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.

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

The noise at the input of an ideal frequency detector is white, the power spectral density of the noise at the output is:

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

Assertion (A): FET is a majority carrier device whereas BJT works based on movement of both majority and minority carriers. Reason (R): Thermal runaway occurs in FET circuits but does not occur in BJT circuits.

Assertion (A): Feedback control systems offer more accurate control over open-loop systems. Reason (R): Feedback establishes a link for input-output comparison and correction.

If a fair coin is tossed 4 times, what is the probability that two heads and two tails will result?

In a Quadrature Amplitude Modulation (QAM) scheme, information is encoded in:

According to Nyquist stability criterion, the number of unstable closed-loop poles (Z) is equal to: