Q. In the figure, an RLC load is supplied by a 230 V, 50 Hz single phase source. The magnitude of the reactive power (in VAr) supplied by the source is Ans: 66-68

Q. In the given circuit, superposition is applied. When V2 is set to 0 V, the current I2 is -6 A. When V1 is set to 0 V, the current I1 is +6 A. Current I3 (in A) when both sources are applied will be (up to two decimal places) . Ans: 0.95-1.05

Q. In the given circuit, superposition is applied. When V2 is set to 0 V, the current I2 is -6 A. When V1 is set to 0 V, the current I1 is +6 A. Current I3 (in A) when both sources are applied will be (up to two decimal places) Ans: 0.95-1.05

Q. Two bags 𝐴 and 𝐵 have equal number of balls. Bag 𝐴 has 20% red balls and 80% green balls. Bag 𝐵 has 30% red balls, 60% green balls and 10% yellow balls. Contents of Bags 𝐴 and 𝐵 are mixed thoroughly and a ball is randomly picked from the mixture. What is the chance that the ball picked is red? ...

Q. An optical pulse containing 6 × 106 photons is incident on a photodiode and 4.5 × 106 electron-hole pairs are created. The maximum possible quantum efficiency (in %) of the photodiode is Ans: 75 Sol: Number of incident photons ′N′=6×106 Number of electron-hole pairs generated ...

Q. An amplitude modulated signal is shown in the figure. The modulation index is (up to one decimal place) . Ans: 0.3

Q. A piezoelectric pressure sensor has a bandpass characteristic with cut-off frequencies of 0.1 Hz and 1 MHz, and a sensitivity of 100 mV/kPa. The sensor is subjected to a static constant pressure of 100 kPa. Its steady-state output will be (A) 0 V                       (B) 0.1 ...

Q. As shown in the figure, temperature q is measured using a K type thermocouple. It has a sensitivity of 40 mV/°C. The gain (G) of the ideal instrumentation amplifier is 25. If the output Vo is 96 mV, then the value of q (in °C) is _ . Ans: 95-97

Q. A 300 V, 5A, 0.2 pf low power factor wattmeter is used to measure the power consumed by a load. The wattmeter scale has 150 divisions and the pointer is on the 100th division. The power consumed by the load (in Watts) is . Ans: 200 Sol: Given that, voltage (V) = 300 V current (I) = 5A ...

Q. A voltage of 6 cos(100πt) V is fed as y-input to a CRO. The waveform seen on the screen of the CRO is shown in the figure. The Y and X axes settings for the CRO are respectively (A) 1 V/div and 1 ms/div                               (B) 1 V/div and 2 ms/div (C) 2 V/div and 1 ...