Q. A multi-mode optical fiber with a large core diameter has a core refractive index 𝑛1 = 1.5 and cladding refractive index 𝑛2 = 1.4142. The maximum value of 𝜃𝐴 (in degrees) for which the incident light from air will be guided in the optical fiber is ± . Ans: 29-31
Q. A Michelson Interferometer using a laser source of wavelength 𝜆0 = 500 nm, with both the mirrors (𝑀1& 𝑀2) fixed and positioned equidistant from the splitter/combiner is shown in the figure. When a dielectric plate of refractive index 𝑛 = 1.5, of thickness 𝒕 , is placed in front of the mirror 𝑀2 ,
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Q. The sampling rate for Compact Discs (CDs) is 44,000 samples/s. If the samples are quantized to 256 levels and binary coded, the corresponding bit rate (in bits per second) is . Ans: 352000
The sampling rate for Compact Discs (CDs) is 44,000 samples/s Read More »
Q. Assuming ideal opamp, the RMS voltage (in mV) in the output Vo only due to the 230 V, 50 Hz interference is (up to one decimal place) _. Ans: 10.6-11
Q. A 1000 W strain gage (Rg) has a gage factor of 2.5. It is connected in the bridge as shown in figure. The strain gage is subjected with a positive strain of 400 mm/m. The output Vo (in mV) of the bridge is (up to two decimal places) . Ans: 0.48-0.51
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Q. The average velocity v of flow of clear water in a 100 cm (inner) diameter tube is measured using the ultrasonic flow meter as shown in the figure. The angle q is 45°. The measured transit times are t1 = 0.9950 ms and t2 = 1.0000 ms. The velocity v (in m/s) in the
Q. The inductance of a coil is measured using the bridge shown in the figure. Balance (D = 0) is obtained with C1 = 1 nF, R1 = 2.2 MΩ, R2 = 22.2 kΩ, R4 = 10 kΩ. The value of the inductance Lx (in mH) is Ans: 221 – 223
Q. A high Q coil having distributed (self) capacitance is tested with a Q-meter. First resonance at w1 = 106 rad/s is obtained with a capacitance of 990 pF. The second resonance at w2 = 2 ×106 rad/s is obtained with a 240 pF capacitance. The value of the inductance (in mH) of the coil
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Q. The voltage and current drawn by a resistive load are measured with a 300 V voltmeter of accuracy ± 1% of full scale and a 5 A ammeter of accuracy ± 0.5% of full scale. The readings obtained are 200 V and 2.5 A. The limiting error (in %) in computing the load resistance
Q. The Boolean function 𝐹( 𝑋, 𝑌) realized by the given circuit is (A) 𝑋̅ 𝑌 + 𝑋 𝑌̅ (B) ̅𝑋 𝑌̅ + 𝑋 𝑌 (C) 𝑋 + 𝑌 (D) 𝑋̅ ∙ 𝑌̅ Ans: X̅ Y + X Y̅
The Boolean function 𝐹( 𝑋, 𝑌) realized by the given circuit is Read More »
