This set of Engineering Metrology Multiple Choice Questions & Answers (MCQs) focuses on “Radius Gauges”.

1. Which of the following is another name of radius gauge?
a) Ring gauge
b) Planer gauge
c) Fillet gauge
d) Plug gauge

Explanation: Fillet gauge is another name of radius gauge. Fillet gauges are used to check the radius of an object. Radius gauges can also be used for inspection work.

2. Why a radius is provided at the meeting point of two surfaces?
a) To reduce material
b) To avoid collision
c) To increase stability
d) To avoid stress concentration

Explanation: Sharp corners are subjected to more stress. So, to avoid stress concentration, radius is provided.

3. Which of the following option is incorrect with respect to radius gauges?
b) Radius gauges are used for final inspection
c) If the curved surface is external then this radius is known as female radius

Explanation: If the curved surface is external then it is called male radius or simply radius. Term Female radius is used for internal curved surface.

4. Match the following:

```A) Precision polygons        -    1) Indexing
B) Radius gauge              -    2) Checking known angles
C) Dividing head             -    3) Measure concave surfaces
D) Sine bar                  -    4) Calibration of rotary table```

a) A-1, B-3, C-2, D-4
b) A-4, B-3, C-1, D-2
c) A-3, B-2, C-4, D-1
d) A-2, B-1, C-3, D-4

Explanation: Precision polygons are used to calibrate dividing heads and rotary tables. Radius gauges are used to measure and check concave and convex surfaces. Sine bars are used to locate work at a given angle. Sine bars are also used to measure known and unknown angles.
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5. Which of the following option is true for given statement?
Statement 1: For gauging the radius, a light source is used with radius gauge.
Statement 2: Pitch of the threads can be measured by radius gauge.
a) T, F
b) T, T
c) F, T
d) F, F

Explanation: A light source is used with radius gauges. Work is placed between light source and eye. It is the light passage due to which work can be gauged properly. To determine thread pitch, pitch screw gauge are used.

a) Leaf
b) Petal
c) Cutter
d) Scale

Explanation: Each radius gauge has a number of blades. These blades are also known as leaves. Leaves can be used in any position to measure radius.

7. Which of the following is not a type of radius gauge?
a) Acrylic
b) Guitar
c) Digital
d) Planer

Explanation: Planer gauge is a measuring instrument which is used to measure slot width and setting tool height. It has two triangular blocks whose sides can be clamped.

8. What is the measuring range for radius gauge?
a) 0.00075-0.025 m
b) 0.0075-0.5m
c) 0.075-5m
d) 0.75-5m

Explanation: Measuring range of radius gauge is generally 0.00075 to 0.025 meter. The blades are specially shaped and can be used to measure fillets and radius against shoulders or corners.

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