Deemed University 2009 A.M.I.E.T.E Electronics & Communication Engineering Instrumentation and measurement – et (old scheme) - Question Paper

AMIETE – ET (OLD SCHEME)

Code: AE12 Subject: INSTRUMENTATION AND MEASUREMENT
Time: three Hours Max. Marks: 100

NOTE: There are nine ques. in all.
· ques. one is compulsory and carries 20 marks. ans to Q. 1. must be written in the space given for it in the ans book supplied and nowhere else.
· Out of the remaining 8 ques. ans any 5 ques.. every ques. carries 16 marks.
· Any needed data not explicitly given, may be suitably presumed and said.


Q.1 select the accurate or the best option in the following: (210)

a. The smallest change in measured variable to which an instrument will respond is

(A) Accuracy. (B) Resolution.
(C) Precision. (D) Sensitivity.

b. A wheatstone bridge requires a change of six ohm in the unknown arm of the bridge to produce a change in deflection of three mm of the galvanometer. The sensitivity of the instrument is

(A) 0.5%. (B) 2%.
(C) 0.5 mm/ohm. (D) 2.0 ohm/mm.

c. The zero fault of an instrument is

(A) Gross fault. (B) Systematic fault.
(C) Random fault. (D) Indefinite fault.

d. Primary standard for voltage maintained by National standard laboratories is a

(A) Zero diode with 1.5 V output .
(B) Weston standard cell with 1.01858 V at .
(C) Nickel Cadmium rechargeable cell with 1.25 V output at .
(D) Josephson thin film junction near 273 K.

e. The internal resistance of the millammeter must be very low for

(A) High sensitivity.
(B) High accuracy.
(C) Max voltage drop across meter.
(D) Max effect on the current in circuit.

f. A DC voltmeter has a sensitivity of, when it measures half full scale deflection in 100 V range, the current through the voltmeter is

(A) 100 mA. (B) one mA.

Earning:   Approval pending.