I am searching here question paper for GATE Instrumentation Engineering examination in PDF format ??

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Q.17 A psychrometric chart is used to determine
(A) pH (B) Sound velocity in glasses
(C) 2 CO concentration (D) Relative humidity

Q.20 An LED emitting at 1 m with a spectral width of 50 nm is used in a Michelson interferometer. To
obtain a sustained interference, the maximum optical path difference between the two arms of the
interferometer is
(A) 200 m (B) 20 m (C) 1 m (D) 50 nm

Q.21 Light of wavelength 630 nm in vacuum, falling normally on a biological specimen of thickness
10 m, splits into two beams that are polarized at right angles. The refractive index of the tissue for
the two polarizations are 1.32 and 1.333. When the two beams emerge, they are out of phase by
(A) 0.13 (B) 74.3 (C) 90.0 (D) 128.6

Q.25 The bridge method commonly used for finding mutual inductance is
(A) Heaviside Campbell bridge (B) Schering bridge
(C) De Sauty bridge (D) Wien bridge

Q. 26 to Q. 55 carry two marks each.
Q.26 A fair coin is tossed till a head appears for the first time. The probability that the number of
required tosses is odd, is
(A) 1/3 (B) 1/2 (C) 2/3 (D) ¾

A double convex lens is used to couple a laser beam of diameter 5 mm into an optical fiber with a
numerical aperture of 0.5. The minimum focal length of the lens that should be used in order to
focus the entire beam into the fiber is
(A) 1.44 mm (B) 2.50 mm (C) 4.33 mm (D) 5.00 mm

Q.42 An analog voltmeter uses external multiplier settings. With a multiplier setting of 20 kit reads
440 V and with a multiplier setting of 80 kit reads 352 V. For a multiplier setting of 40 k the
voltmeter reads
(A) 371 V (B) 383 V (C) 394 V (D) 406 V

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