JNTU Ananthapur Basic civil and mechanical engineering first unit multiple choice questions and answers

1. • 1.Strain can also be measured by sensing
change in electrical resistance.
• A.True
• B.False

2. 2.Resistance strain gauges, commercially
available from the early
A.1940
B. 1840
C. 1740
D. 1540

3. • 3.………is a device which is used to measure
strain (deformation) on an object subjected to
forces.
• A. strain gauge
• B.Pressure gauge
• C.pnumatic gauge
• D. hydraulic

4. 4.The most commonly used strain gauge is an
electrical resistance strain gauge.
• A.True
• B.False

5. • 5.A ……… is an electrical circuit used to
measure an unknown electrical resistance by
balancing two legs of a bridge circuit, one leg
of which includes the unknown component.
• A. Unbalanced bridge
• B. Wheatstone bridge
• C.both A&B
• D.None

6. • 6.The Wheatstone bridge was invented
by Samuel Hunter Christie (sometimes spelled
"Christy") in 1833 and improved and
popularized by Sir Charles Wheatstone in
1843.
• A.True
• B.False

7. 7.One of the Wheatstone bridge's initial uses
was for …………….and comparison.
A.air Analysis
B. Temperature analysis
C.sand analysis
D. Soil analysis

8. • 8. Strain gauge measurement involves
__________
A.Wheatstone bridge
B. Kelvin bridge
C. De Sauty’s bridge
D. Anderson bridge

9. • 9. Load cell is used for the measurement of
_______
a) area
b) force
c) mass
d) length

10. • 10. Strain is a _______
a) fractional change in volume
b) fractional change in area
c) fractional change in length
d) fractional change in height

11. • 11. Semiconductor strain gauge uses _______
a) rectifier circuitry
b) power electronics circuitry
c) ordinary bridge circuit
d) bridge circuit with temperature
compensation

12. • 12. Metals in strain gauge construction have
_______
a) non-linear temperature coefficient
b) linear temperature coefficient
c) tangential temperature coefficient
d) exponential temperature coefficient

13. • 13. A Wheatstone bridge has _______
a) low sensitivity
b) zero sensitivity
c) high sensitivity
d) infinite sensitivity

14. • 14. Load cell is sensitive to minute strains.
a) True
b) False

15. • 15. Mass of only about 20 kg can be measured
by a load cell.
a) True
b) False

16. •
16. Which angle of subtension can be
observed by the reflected light beam during
the rotational movement of mirror under the
application of stress in optical gauges?
a. Equal to an angle of incident light
b. Twice to an angle of incident light
c. One-half to an angle of incident light
d. One-third to an angle of incident light

17. • 17. Which phenomenon results in producing
the difference in resistance due to
incapability to regain its original physical
form before an application of stress to the
gauge element?
a. Hysteresis Effect
b. Barkheussan Effect
c. Differentiative Effect
d. Integrative Effect

18. • 18. What kind of electrical displacement
transducers are used to measure an angular
displacement ?
a. Variable Resistive Transducers
b. Variable Capacitive Transducers
c. Variable Inductive Transducers
d. Synchros and Resolver Transducer

19. • 19. How does it become possible to reduce
the interference level generated
corresponding to the stray magnetic fields in
LVDT?
a. By Shielding
b. By Grounding
c. Both a & b
d. None of the above

20. •
20. Which bridge is utilized in signal
conditioning circuits for balancing purpose?
a. Maxwell Bridge
b. Wheatstone Bridge
c. Wein Bridge
d. Kelvin Bridge