# Operation of Strain Gauges

This set of Electrical Measurements & Measuring Instruments Multiple Choice Questions & Answers (MCQs) focuses on “Operation of Strain Gauges”.

1. Electrical strain gauge works on the principle of __________
a) variation of resistance
b) variation of capacitance
c) variation of inductance
d) variation of area

2. The strain gauge is not bonded to the specimen.
a) True
b) False

3. Bonding element in a strain gauge must have __________
a) zero insulation resistance
b) low insulation resistance
c) high insulation resistance
d) infinite insulation resistance

4. Dynamic strain measurements use __________
a) brass iron alloy
b) iron aluminium alloy
d) nickel chromium alloy

5. Commonly used elements for wire strain gauges are __________
a) nickel and copper
b) nickel and gold
c) gold and brass
d) silver and aluminium

6. Cement is classified under __________
a) 4 types
b) 2 types
c) 6 types
d) 8 types

7. Proper functioning of a strain gauge depends on __________
a) strain
b) stress
c) bonding
d) length of wire

8. Gauge factor is given by which of the following relation?
a) S = ΔR/RΔl
b) S = ΔRΔl/l
c) S = RΔl/l
d) S = ΔR/RΔl/l

9. Poisson’s ratio is given by which of the following relation?
a) µ = –Δd/dΔl/l
b) µ = –ΔdΔl/l
c) µ = –dΔl/l
d) µ = –Δd/dΔl

10. Proper bonding causes errors in strain gauges.
a) True
b) False