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
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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 πππ is positive. The current (πΌ) – voltage (π) characteristics of the diode can be assumed to be πΌ = πΌ0ππ/ππ under the forward bias condition, where ππ is the thermal voltage and πΌ0 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 β2 (B) reduce by a factor 2 (C) increase by a factor β2 (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 π₯[π] and output π¦[π] of a discrete-time system are related as](https://www.gkseries.com/blog/wp-content/uploads/2023/08/The-input-π₯π-and-output-π¦π-of-a-discrete-time-system-are-related-as--1024x536.jpg)
Q. The input π₯[π] and output π¦[π] of a discrete-time system are related as π¦[π] = πΌπ¦[π β 1] + π₯[π]. The condition on πΌ for which the system is Bounded-Input Bounded-Output (BIBO) stable is (A) |πΌ| < 1 (B) |πΌ| = 1 (C) |πΌ| > 1 (D) |πΌ| < 3/2 Ans: |πΌ| < 1
The input π₯[π] and output π¦[π] of a discrete-time system are related as Read More Β»
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 π in Figure (a) to that in Figure (b) is (A) β2:1 (B) 2:1 (C) 2β2:1 (D)
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
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 (ππ & ππ) as well as frequencies (ππ & ππ) will be Ans: Option A
