Q. The transfer function relating the input 𝑥(𝑡) to the output 𝑦(𝑡) of a system is given by G(s) = 1 (s + 3) . A unit-step input is applied to the system at time t = 0 . Assuming that 𝑦(0) = 3, the value of 𝑦(𝑡) at time 𝑡 = 1 is (Answer […]
Q. In the circuit shown below, the angular frequency 𝜔 at which the current is in phase with the voltage is_____________rad/s. Ans: 20000 Sol: For the given parallel RLC circuit, current will be in phase with the voltage when circuit operate at resonant frequency. Resonant frequency in parallel RLC circuit,
Q. In the circuit shown below, a step input voltage of magnitude 5 V is applied at node A at time 𝑡 = 0. If the capacitor has no charge for t £ 0 , the voltage at node P at 𝑡 = 6 𝜇s is_____________V. (Answer should be rounded off to two decimal places)
Q. Four identical resistive strain gauges with gauge factor of 2.0 are used in a Wheatstone bridge as shown in the figure below. Only one of the strain gauges 𝑅𝑆𝐸𝑁𝑆𝐸 changes its resistance due to strain. If the output voltage 𝑉𝑂𝑈𝑇 is measured to be 1 mV, the magnitude of strain, in units of microstrain,
Q. A pulsed laser emits rectangular pulses of width 1 nanosecond at a repetition rate of 1 kHz. If the average power output is 1 mW, the average power over a single pulse duration, in watts, is (A) 1 (B) 10 (C) 100 (D) 1000 Ans: 1000 Sol: The underlying concept here to be
Q. A pulsed laser emits rectangular pulses of width 1 nanosecond at a repetition rate of 1 kHz. If the average power output is 1 mW, the average power over a single pulse duration, in watts, is (A) 1 (B) 10 (C) 100 (D) 1000 Ans: 1000 Sol: The underlying concept here to be
Q. A resistance-meter has five measurement range-settings between 200 Ω and 2 MΩ in multiples of 10. The meter measures resistance of a device by measuring a full-range voltage of 2 V across the device by passing an appropriate constant current for each range-setting. If a device having a resistance value in the range 8
Q. A 100 W light source emits uniformly in all directions. A photodetector having a circular active area whose diameter is 2 cm is placed 1 m away from the source, normal to the incident light. If the responsivity of the photodetector is 0.4 A/W, the photo-current generated in the detector, in units of mA,
Q. A piezoelectric transducer with sensitivity of 30 mV/kPa is intended to be used in the range of 0 kPa to 100 kPa. The readout circuit has a peak noise amplitude of 0.3 mV and measured signals over the full pressure range are encoded with 10 bits. The smallest pressure that produces a non-zero output,
Q. In the circuit below, the light dependent resistor (LDR) receives light from the LED. The LDR has resistances of 5 k W and 500 W under dark and illuminated conditions, respectively. The LED is OFF at time 𝑡 < 0. At time t = 0 s, the switch S1 is closed for 1 ms and
