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 ...

Q. The input 𝑥 and output 𝑦 of a discrete-time system are related as 𝑦 = 𝛼𝑦 + 𝑥. 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 Sol: y = α y + x The given ...

Q. In the Figures (a) and (b) shown below, the transformers are identical and ideal, except that the transformer in Figure (b) is centre-tapped. Assuming ideal diodes, the ratio of the root- mean-square (RMS) voltage across the resistor 𝑅 in Figure (a) to that in Figure (b) is (A) √2:1 ...

Q. A box has 8 red balls and 8 green balls. Two balls are drawn randomly in succession from the box without replacement. The probability that the first ball drawn is red and the second ball drawn is green is Sol: A box has 8 red balls and 8 green balls. Two balls are drawn randomly in ...

Q. In an electromagnetic scale modeling experiment in the lab, the relation between the field and lab geometrical scaling factor (n) with the field and lab resistivity (𝜌𝑓 & 𝜌𝑚) as well as frequencies (𝑓𝑓 & 𝑓𝑚) will be Ans: Option A