Instrumentation Transducers

Digital Transducers

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Why positive feedback is used in a pressure transducer?
To improve stability
To maintain stability constant
To maintain vibratory motion
None of the mentioned
Explanation:
Positive feedback in the vibrating diaphragm is used to maintain vibratory motion in diaphragm.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
In vibrating string transducer output frequency is depended on the length of spring by ________
Direct proportionality
Inverse proportionality
Equal
None of the mentioned
Explanation:
Output frequency decreases as the length of string is increased and they are inversely proportional.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
VDP is used for measuring pressure ____________
Less than 1 atmosphere
Between 1 and 100 atmosphere
Above 1000 atmosphere
All of the mentioned
Explanation:
Pressure range between 1 and 100 atmosphere are measured using vibrating diaphragm pressure transducer.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
Density of flowing liquid can be measured using____________
Vibrating tube transducer
Vibrating cylinder transducer
Both vibrating tube and cylinder transducer
None of the mentioned
Explanation:
Only vibrating tube transducer allow flow of liquid and they can be used for measurement of the density of flowing liquid.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is not an encoder?
Optical encoders
Magnetic encoders
Angular digital encoders
None of the mentioned
Explanation:
Different types of encoder devices are available according to their operating medium.
Question 6
Marks : +2 | -2
Pass Ratio : 100%
Datums are used for ___________
Obtaining digital output
Converting analog data to digital data
Storing data
Displaying output
Explanation:
Datums are used in incremental transducers which will consider previous data for display.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Absolute encoders require data.
True
False
Explanation:
Absolute encoders show the output for the present input only, and it doesn’t store any previous data.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
In vibrating tube gas transducer, Pressure difference across wall is varying.
True
False
Explanation:
Pressure difference across walls of tube in vibrating tube gas density transducer is always kept constant to measure the density of liquid.
Question 9
Marks : +2 | -2
Pass Ratio : 100%
LDE is used for measuring ____________
Linear acceleration
Angular acceleration
Linear displacement
Linear acceleration
Explanation:
Linear digital encode or LDE is used for measuring linear displacement.
Question 10
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is correct for a digital transducer?
Measures digital quantity only
Gives digital output
Doesn’t measure analog input
None of the mentioned
Explanation:
A digital transducer is a device which gives output in digital form.