Explore topic-wise MCQs in Sensors And Industrial Instrumentation.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Sensors And Industrial Instrumentation knowledge and support exam preparation. Choose a topic below to get started.

1.

Directions: It consists of two statements one labeled as statement I and the other as statements II. Examine these two statements carefully and select the correct answer using the code given below.Statement I: A salient-pole rotor placed in a magnetic field can produce an emf. proportional to the speed of the rotating machine because of its variable reluctance characteristic.Statement II: The above device is essentially a frequency tachometer using a suitable pulse shaping circuit and an electronic counter.

A. Both statements I and statement II are individually true and statement II is the correct explanation of statement I
B. Both statement I and statement II are individually true but statement II is not the correct explanation of statement I
C. Statements I is true but statement II is false
D. Statement I is false but statement II is true
Answer» B. Both statement I and statement II are individually true but statement II is not the correct explanation of statement I
Discussion
2.

Absolute encoders are normally used for

A. one revolution
B. continuous speed in the clockwise direction
C. continuous speed in the counter-clockwise direction
D. counting the least significant bits
Answer» B. continuous speed in the clockwise direction
Discussion
3.

A tachometer encoder has

A. one output
B. two outputs
C. three outputs
D. none of these
Answer» B. two outputs
Discussion
4.

A variable reluctance tachometer has 180 teeth on its rotor. The speed of the shaft on which it is mounted is 1200 r.p.m. The frequency of the output pulses is

A. 4800 / s
B. 3600 / s
C. 2400 / s
D. 1800 / s
Answer» C. 2400 / s
Discussion
5.

A tachometer encoder can be used for measurement of speed:

A. of false pulses because of electrical noise
B. in forward and reverse directions
C. in one direction only
D. for single revolution in a multiple track
Answer» D. for single revolution in a multiple track
Discussion