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: Let the equivalent circuit […]
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 =
A 3 × 3 matrix has eigenvalues 1, 2 and 5. The determinant of the matrix is . Read More »
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 are simultaneously zero. Ans: sum of material dispersion and waveguide dispersion is zero.
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 amplifier is given by Where Ad is
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 bias, reverse bias Ans: forward bias, reverse bias, reverse bias
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 output voltage
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 well-designed control
![The input 𝑥[𝑛] and output 𝑦[𝑛] of a discrete-time system are related as](https://www.gkseries.com/blog/wp-content/uploads/2023/08/The-input-𝑥𝑛-and-output-𝑦𝑛-of-a-discrete-time-system-are-related-as--1024x536.jpg)
Q. The input 𝑥[𝑛] and output 𝑦[𝑛] of a discrete-time system are related as 𝑦[𝑛] = 𝛼𝑦[𝑛 − 1] + 𝑥[𝑛]. The condition on 𝛼 for which the system is Bounded-Input Bounded-Output (BIBO) stable is (A) |𝛼| < 1 (B) |𝛼| = 1 (C) |𝛼| > 1 (D) |𝛼| < 3/2 Ans: |𝛼| < 1
The input 𝑥[𝑛] and output 𝑦[𝑛] of a discrete-time system are related as Read More »
