PYQs Based test 18: Analog Electronics

The temperature of the coolant oil bath for a transformer is monitored using the circuit shown. It contains a thermistor with a temperature-dependent resistance, R${}_{thermistor}$ =2 (1 + α T) kΩ, where T is temperature in °C. The temperature coefficient, α, is –(4 ± 0.25) %/°C. Circuit parameters: R₁ = 1 kΩ, R₂ = 1.3 kΩ, R₃ = 2.6 kΩ. The error in the output signal (in V, rounded off to 2 decimal places) at 150°C is _______

In the circuit below, the operational amplifier is ideal. If V ₁= 10 mV and V ₂= 50 mV, the output voltage (V ₒᵤₜ) is

A non-ideal diode is biased with a voltage of -0.03 V, and a diode current of I₁ is measured. The thermal voltage is 26 mV and the ideality factor for the diode is 15/13. The voltage, in V, at which the measured current increases to 1.5 I₁ is closest to:

For the circuit shown in the figure below, it is given that $V_{CE}=\frac{V_{CC}}{2}$. The transistor has β = 29 and V${}_{BE}$ = 0.7 V when the B-E junction is forward biased.



For this circuit, the value of $\frac{R_B}{R}$ is

The enhancement type MOSFET in the circuit below operates according to the square law. μₙCₒₓ = 100 μA/V², the threshold voltage (V${}_T$) is 500 mV. Ignore channel length modulation. The output voltage Vₒᵤₜ is