1) Which one of the following thread is used for transmitting motion?
Isometric thread
Trapezoidal thread
B.S.W. thread
Round thread
Correct answer
Trapezoidal thread
2) What is the advantage of helical fluted taps?
Chips come out easily
Drilling to minor diameter is not necessary
Self-alignment of the tap is possible
Lubrication is easy
Correct answer
Chips come out easily
3) Name the instrument to measure the diameter of the round rod.
Tube micrometer
Outside micrometer
Depth micrometer
Inside micrometer
Correct answer
Outside micrometer
4) In order to detect the cracks in a grinding wheel, the test adapted is .........
soap water test
ringing test
hardness test
X-ray test
Correct answer
ringing test
5) Which is represented by the symbols V, S, B, R & E?
Bond material
Silicon carbide
Grit size
The grade of the grinding wheel
Correct answer
Bond material
6) Which one of the following elements cannot be checked with the screw pitch gauge?
Depth
Profile
Lead
Pitch
Correct answer
Lead
7) The point angle of the drill bit depends on the ........
size of the drill
rpm of the drill
type of machine
the material of the workpiece
Correct answer
the material of the workpiece
8) Name the accessories which are NOT used in the drilling machine.
Tool holder
Drill Chuck
Sleeve
Socket
Correct answer
Tool holder
9) Name the part ‘X’ in the figure.
Flutes
Shank
Land/margin
Body clearance
Correct answer
Body clearance
10) In the BIS system of limits, there are 18 grades of tolerance, represented by number symbols for both hole and shaft. Which one of the following ranges of grades is best suitable for the manufacture of gauges?
12 to 16
8 to 12
5 to 8
1 to 4
Correct answer
1 to 4
11) The figure below shows a clearance fit study figure and calculate the maximum and minimum clearance.
0.040, 0.006 mm
0.041, 0.007 mm
0.042, 0.008 mm
0.043, 0.009 mm
Correct answer
0.041, 0.007 mm
12) The difference between the maximum limit of size and the minimum limit of size is called .........
actual size
tolerance
upper deviation
lower deviation
Correct answer
tolerance
13) What is the function of part “pilot” provided in reamers?
Hold in the machine spindle
Finish concentric holes
Removing chips
Hold in a tap wrench
Correct answer
Finish concentric holes
14) Puddling furnace is used to produce .............
wrought iron
cast iron
steel
pig iron
Correct answer
wrought iron
15) Name the property which influences sudden breakage of cast iron job while hammering ..........
brittleness
malleability
toughness
ductility
Correct answer
brittleness
16) The principle of working of a plunger type dial test indicator is ...........
the linear motion is converted into a reciprocating motion, using the slotted link
magnification by electronic means
the linear motion is converted into a rotary motion using rack and pinion
magnification of small variation using lenses
Correct answer
the linear motion is converted into a rotary motion using rack and pinion
17) The least count of a vernier height gauge in the metric system is ............
0.05 mm
0.01 mm
0.001 mm
0.02 mm
Correct answer
0.02 mm
18) Name the division marked ‘X’ indicate?
Main scale division
Thimble graduations
Datum line
Vernier graduations
Correct answer
Vernier graduations
20) Gunmetal is an alloy of ................
copper, zinc, and lead
copper, tin, and zinc
zinc, lead, and tin
copper, lead and tin
Correct answer
copper, tin, and zinc
21) which property can be increased in copper by cold forging and rolling?
Hardness
Malleability
Ductility
Elasticity
Correct answer
Hardness
22) The instrument which is used for measuring the number of threads per inch is ……….
A taper plug gauge
A taper ring gauge
Thread gauge
Screw pitch gauge
Correct answer
Screw pitch gauge
23) hook scrapers are used for scraping ……..
Curved surface
Hollow surface
the center portion of a large flat surface
bend surface
Correct answer
the center portion of a large flat surface
24) Preventive maintenance is ..................
the overall lubrication and repair work carried out by the maintenance section in advance
done after the breakdown of the machine
done to prevent the maintenance of machines
the maintenance work for any fault noticed during the work
Correct answer
the overall lubrication and repair work carried out by the maintenance section in advance
25) Select the formula for finding r.p.m. for drilling where V= cutting speed in m/min, d = diameter of the drill in mm
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