Engineering Questions with Answers - Multiple Choice Questions

# MCQs on V-Block

1 - Question

What is the use of V-Blocks?
a) For checking only squareness of square work pieces
b) For checking roundness
c) Only for the support purposes
d) To support triangular surfaces only

Explanation: V-Blocks are generally used for cylindrical workpieces to check their roundness and for marking centres. V-blocks are like precision metalworking jigs which are used to hold workpieces. These are available in market with wide range of varieties.

2 - Question

What is the bearing area of V-Blocks?
a) 5%
b) 10%
c) 15%
d) 20%

Explanation: Vee-Blocks have bearing area of greater than or equal to 20%. V-blocks are used for inspection and workshop purposes. A small groove is present at the bottom of the ‘V’. They are used with screw clamps for holding the work.

3 - Question

What is the symmetrization accuracy of vees in V-Blocks?
a) 0.002 mm per 20 mm length
b) 0.001 mm per 20 mm length
c) No effect of symmetry
d) 0.02 mm per 20 mm length

Explanation: V blocks have symmetrization accuracy of 0.002 mm per 20 mm length in Vs and straightness accuracy is ±0.01 mm per 20 mm length.

4 - Question

Which of the following is incorrect about V-Blocks?
a) V-Blocks should be checked periodically for accuracy
b) V-Blocks are used to establish centre axis of a cylindrical piece precisely
c) First check the V-Blocks visually before using
d) V-Blocks cannot be used with clamps

Explanation: V-blocks should be checked periodically for accuracy and also checked for scratches and dents. Sometimes clamps are used with V-Blocks to secure the work.

5 - Question

Which V block is used for checking triangle effect?
a) V block with 120-degree angle is used
b) V block with 90-degree angle is used
c) V block with 60-degree angle is used
d) V block with 30-degree angle is used

Explanation: V-blocks with 120-degree vee angle are available for some special purposes like checking triangle effect or taps. V-blocks with 90-degree angle are general purpose V-Blocks.

6 - Question

Which of the following grades is specified by IS: 2494-1964?
b) Four grades of vee Blocks, viz. Grade A, B, C and D
d) Four grades of vee Blocks, viz. Grade 1, 2, 3 and 4

Explanation: Depending upon the accuracy there are two grades (grade A and grade B) are specified by IS: 2494-1964. Vee blocks should check periodically to correct inaccuracies in blocks if any.

7 - Question

Which of the following option is correct for the given statements about working surface of V blocks?
Statement 1: V-Blocks have only one working surface i.e. flanks of vees.
Statement 2: Side faces of V-blocks are not working surfaces.
a) Both statements are true
b) Statement 1 is correct
c) Statement 2 is correct
d) Both statements are false

Explanation: V-blocks generally have four working faces. These working faces are flanks of vees, base end faces, top and sides faces of V-blocks. They are generally supplied as matched pairs in which 2 V-blocks are of almost same size with the same grade of accuracy.

8 - Question

Which of the following option is correct for the given statements related to V-blocks? (T=True/ F=False)
Statement 1: V-blocks can be used as a magnetic work holding device.
Statement 2: V-blocks with internal magnets help in milling operation.
a) T, T
b) T, F
c) F, T
d) F, F

Explanation: Some V-blocks also has an internal magnet which can be used for holding magnetic work. V-blocks are widely used work holding device which can be used for many operations like drilling, grinding and milling.

9 - Question

Which of the following is correct for departure from flatness in Vees?
a) Any departure from flatness in vees should be a concavity
b) Any departure from flatness parallel to the vee axis should be a concavity
c) Any departure from flatness parallel to the vee axis should be a convexity
d) Any departure from flatness in vees can be a concavity or convexity

Explanation: Any departure from flatness on surfaces other than vees should be a concavity and from vees should be convexity. Any departure from flatness parallel to the vee axis should be a concavity.

10 - Question

Which of the following is incorrect about V blocks?
a) Cylindrical piece should be placed on the vee sides
b) Cylindrical piece should be placed on the edges of the vees
c) V-Blocks generally sold in pairs
d) V-blocks can support square, round and rectangular pieces