78.

79.

80.

81.

82.

83.

099/23

Match the correct pairs :

Processes Function of fluid used
P. EDM 1. Abrasive action
Q. USM 2. Prevents electric cond.
R. ECM 3. Electrolyte
A) P-1, Q-2, R-3 B) P-3, Q-2, R-1
C) P-3, Q-1, R-2 D) ೧-2, ೧-1, ೧-3

A spherical drop of molten metal of radius 5 mm was found to solidify in 20 seconds.
Asimilar drop of radius 10 mm will solidify in

A) 20 sec B) 50sec C) 60 sec D) 80sec

Compound rest is a part in lathe used to
A) hold work piece B) hold the tool
C) turn the tool for angular cuts D) move the carriage

In ashaping machine, a work piece with 600 mm x 600 mm surface is to be machined.
Return to cutting time ratio is 2: 3, cutting speed is 6 m/min and feed is 2mm/double
stroke. What is the minimum possible machining time required for complete one pass
over surface ?

A) 50 min B) 40 min C) 30 min D) 60 min

For checking the flatness of a surface which of the following instruments can be
used ?

i. Dial gauge
1. Autocollimator
iii. Plug gauge
A) only ii 8) only i and ii
C) only iand iii D) alli, ii and iii

The main objective of honing operation is

A) mass removal of material

B) to improve the accuracy of surface

C) to improve the surface finish
)

D) to remove the marks on machined surface

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