GATE Electronics Instrumentation Multiple Choice Questions & Answers - 1

Question: 1

A diaphragm has a natural frequency of 30 kHz. If both its diameter and thickness are halved, the natural frequency is

(A) 15 kHz

(B) 60 kHz

(C) 120 kHz

(D) 240 kHz

Question: 2

A recorder

(A) Is an indicating instrument which displays a time varying signal

(B) Is a device whose function is to record the value of quantity as it is being measured

(C) Records electrical and non electrical quantities as a function of time or relates two signals to each other

(D) Both b and c

Question: 3

When system noise is large and signal power is low in telemetry system, what is the preferred form of modulation?

(A) Pulse position modulation

(B) Pulse code modulation

(C) Pulse amplitude modulation

(D) Pulse width modulation

Question: 4

A hot wire anemometer is a device used to measure

(A) Temperature

(B) Liquid discharge

(C) Pressure in gases

(D) Gas velocities

Question: 5

Pitot tubes are used for

(A) Industrial applications

(B) Laboratory experimental purposes

(C) Both industrial and laboratory applications

(D) None of the above