Instrumentation Transducers

Torque Measurement

Question 1
Marks : +2 | -2
Pass Ratio : 22%
Which of the following can be well suited for flat-spiral spring device?
Used for a very low torque range
Used for a very high torque range
Used for all ranges of torque
None of the mentioned
Explanation:
Flat spiral spring devices is only applicable for the very low range of torque measurement since high range of force may break the device.
Question 2
Marks : +2 | -2
Pass Ratio : 33%
___________ is used for measuring torque in rotating parts in machines.
Accelerometer
Dynamometer
Tachometer
None of the mentioned
Explanation:
Dynamometers are the devices which are used to measure torque in rotating parts of machines, mainly torque of rotating shafts.
Question 3
Marks : +2 | -2
Pass Ratio : 33%
Square cross sectional torsions bars are preferable than circular cross sectional torsion bars.
True
False
Explanation:
Due to higher mechanical stability provided by square cross sectional torsion bars, they are highly preferable than circular cross sectional.
Question 4
Marks : +2 | -2
Pass Ratio : 11%
A torsion bar of constant inner radius and length is applied with constant torque. What will happen for the angular displacement if outer radius of torsion bar is increased?
Increase
Decreases
Doubles
Halved
Explanation:
Relation between angular displacement and radius of the torsion bar can be explained using an expression:
Question 5
Marks : +2 | -2
Pass Ratio : 33%
Which of the following is true for torque measurement?
Measurement of applied force only
Measurement of length of arm
Measurement of force and length of arm
Measurement of velocity of material
Explanation:
Torque can be measured as the product of applied force and length of arm. Hence both of the parameters are important in the measurement of torque.
Question 6
Marks : +2 | -2
Pass Ratio : 33%
Which of the following devices can be used for measuring torque?
Helical spring
Flat spiral spring
Bellows
Diaphragm
Explanation:
Flat spiral springs are, flat springs which are fixed at center and force is applied on the peripheral end.
Question 7
Marks : +2 | -2
Pass Ratio : 22%
Torque can be measured using surface shear strains.
True
False
Explanation:
Torque can also be measured using measuring surface shear strains of the material. Merit of this system is that, it is independent of temperature variations.
Question 8
Marks : +2 | -2
Pass Ratio : 11%
Which of the following represents a moment of inertia of force acting tangential to a cylindrical rod?
FR
F/R
F2R
FR2
Explanation:
Moment of inertia of force acting tangential to a rod is the product of force and radius of the rod.
Question 9
Marks : +2 | -2
Pass Ratio : 44%
Which of the following represents the correct relationship between angular displacement and torque?
Direct proportionality
Inverse proportionality
Equal magnitude
None of the mentioned
Explanation:
Torque of a bar is proportional to force applied tangential to bar, and hence torque can be treated as direct proportional with angular displacement.
Question 10
Marks : +2 | -2
Pass Ratio : 22%
Which of the following represents the correct position of strain gauges in torque measurement?
900 with each other
Parallel to shaft axis
Perpendicular to shaft axis
450 from shaft axis
Explanation:
All strain gauges are positioned 450 equally from shaft axes, such an arrangement causes insensitivity to bending or axial stress.