# Electrical Measurements Questions and Answers – Types of Strain Gauges

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

1. Strain gauges are classified into ________
a) 3 types
b) 5 types
c) 7 types
d) 9 types

Explanation: Strain gauges can be classified into three broad categories based on the principle of operation and construction. They are mechanical, optical, and electrical.

2. Resistance wire gauges come in _______
a) 4 forms
b) 2 forms
c) 6 forms
d) 8 forms

Explanation: Strain gauges made out of electrical wires come in two broad forms. They are as follows:
• Bonded
• Unbonded.

3. Bonded resistance wire strain gauge is of _______
a) 7 types
b) 5 types
c) 3 types
d) 9 types

Explanation: The bonded electrical wire resistance strain gauge is broadly classified into three main types. They are as follows:
• Flat grid
• Helical grid
• Thin foil.

4. Commonly used electrical strain gauge is _______
a) open type
b) closed type
c) unbounded type
d) bonded type

Explanation: Electrical strain gauges are a type of strain gauge. The commonly used electrical strain gauge is the bonded resistance type. Capacitance and inductance types are used in special types of applications.

5. Electrical strain gauges measure changes in _______
a) resistance, capacitance and inductance
b) resistance only
c) capacitance only
d) inductance only

Explanation: Strain is transferred between the specimen and the gauge element in a strain gauge. Electrical strain gauges measure the changes occurring in resistance, capacitance and inductance.
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6. Mechanical gauges measure the _______
a) change in resistance
b) change in length
c) change in area
d) change in inductance

Explanation: A mechanical gauge is used to measure the change in length. They make use of gears. Mechanical gauges are used for static strain measurements only.

7. Optical gauges make use of _______
a) pulleys
b) electricity
c) mirrors
d) rack and pinion

Explanation: Optical gauges are similar to mechanical gauges. They make use of prisms and mirrors for obtaining magnification. A plain mirror is fixed onto a movable knife edge.

8. Tensile stress decreases the length.
a) True
b) False

Explanation: Tensile stress tends to elongate a wire. As a result its length increases and its area of cross-section decreases.

9. In a foil strain gauge, strain is detected through _______
a) a capacitance element
b) a resistance wire
c) a gold foil
d) a metal foil

Explanation: Strain is detected in a foil strain gauge by making use of a metal foil. The foil makes use of nickel, nichrome, constantan, isoelastic, and platinum.

10. Etched foil strain gauges are flexible.
a) True
b) False

Explanation: Etched foil strain gauges are a type of foil strain gauge. Compared to resistance wire gauges, they can be made thinner. They are also flexible. Etched foil strain gauges are made use o curved surfaces.

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