Q. The total number of Boolean functions with distinct truth-tables that can be defined over 3 Boolean variables is Sol: The total number of Boolean function with distinct truth table will be for n Boolean variables (22n) so for 3 Boolean variables=(223)=256

Q. An 8-bit weighted resistor digital-to-analog converter (DAC) has the smallest resistance of 500 Ω. The largest resistance has a value Sol: In general, in a binary weighted resistor DAC, the relationship between LSB and MSB resistance is given as :LSB Resistance =(2n−1) MSB resistance ...

Q. In the circuit shown below, initially the switch S1 is open, the capacitor C1 has a charge of 6 coulomb, and the capacitor C2 has 0 coulomb. After S1 is closed, the charge on C2 in steady state is coulomb. Sol: When switch open, Q1 = 6 C, Q2 = 0 C, C1 = 1 F, C2 = 2 F Q1 = ...

Q. Consider a circuit comprising only resistors with constant resistance and ideal independent DC voltage sources. If all the resistances are scaled down by a factor 10, and all source voltages are scaled up by a factor 10, the power dissipated in the circuit scales up by a factor of Sol: ...

Q. A 3 × 3 matrix has eigenvalues 1, 2 and 5. The determinant of the matrix is              . Sol: Given that, Eigen values of a matrix λ1 = 1, λ2 = 2, λ3 = 5 From the property of Eigen values, Determinant of a matrix = product of its Eigen values ⇒ Determinant = λ1 λ2 λ3 = ...

Q. In a single-mode optical fiber, the zero-dispersion wavelength refers to the wavelength at which the (A) material dispersion is zero. (B) waveguide dispersion is zero. (C) sum of material dispersion and waveguide dispersion is zero. (D) material dispersion and waveguide dispersion ...

Q. Four strain gauges in a Wheatstone bridge configuration are connected to an instrumentation amplifier as shown in the figure. From the choices given below, the preferred value for the common mode rejection ratio (CMRR) of the amplifier, in dB, would be Ans: 100 Sol: CMRR of an ...

Q. Thermocouples measure temperature based on (A) Photoelectric effect (B) Seebeck effect (C) Hall effect (D) Thermal expansion Ans: Seebeck effect

Q. The correct biasing conditions for typical operation of light emitting diodes, photodiodes, Zener diodes are, respectively (A) forward bias, reverse bias, reverse bias (B) reverse bias, reverse bias, forward bias (C) forward bias, forward bias, reverse bias (D) reverse bias, forward ...

Q. In the circuit shown below, the input voltage 𝑉𝑖𝑛 is positive. The current (𝐼) - voltage (𝑉) characteristics of the diode can be assumed to be 𝐼 = 𝐼0𝑒𝑉/𝑉𝑇 under the forward bias condition, where 𝑉𝑇 is the thermal voltage and 𝐼0 is the reverse saturation current. Assuming an ideal op-amp, the ...

Q. If each of the values of inductance, capacitance and resistance of a series LCR circuit are doubled, the Q-factor of the circuit would (A) reduce by a factor √2 (B) reduce by a factor 2 (C) increase by a factor √2 (D) increase by a factor 2 Ans: reduce by a factor 2 Sol: ...

Q. In a cascade control system, the closed loop transfer function of the inner loop may be assumed to have a single time-constant T1 . Similarly, the closed loop transfer function of the outer loop may be assumed to have a single time-constant T2. The desired relationship between T1 and T2 in a ...