IndiaBIX

Electronics and Communication Engineering - Measurements and Instrumentation

Exercise : Measurements and Instrumentation - Section 4
31.
The deflection of a DArsonval galvanometer is measured through a mirror and scale. The mirror is 1 m away from the light source. The mirror is mounted on, the moving system. If mirror rotates through 0.2 rad the displacement on the scale is
0.2 m
0.4 m
0.1 m
0.05 m
Answer: Option
Explanation:

Diplacement = (1) (2θ) = 0.4 m.

32.
Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than
50 A
37.5 A
25 A
40 A
Answer: Option
Explanation:

or V = 37.5 V.

33.
A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters
are common
are separate
are generally common
are generally separate
Answer: Option
Explanation:

The moving system has to be common since reading depends on the action of both wattmeters.

34.
The dead zone in a pyrometer is 0.125% of span. The calibration is 400°C to 1000°C. What temperature change might occur before it is detected.
0.125°C
0.75°C
0.4°C
1°C
Answer: Option
Explanation:

Span = 600°, .

35.
The dimensions of force are
MLT-2
ML-1T-2
MLT-1
ML2T-2
Answer: Option
Explanation:

F = ma = MLT-2.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers