1) The main purpose of annealing is .............
to increase the hardness
to increase the toughness
to improve the machinability
to remove the distortion
Correct answer
to improve the machinability
2) The important dimensions of a taper are ...........
one diameter and the length of the taper.
large diameter and the smaller diameter of the taper.
the large diameter and the length of the taper.
the large diameter, the smaller diameter and the length of the taper.
Correct answer
the large diameter, the smaller diameter and the length of the taper
3) File grades are determined by the ..............
shape of the file
the spacing of the teeth
cut of the file
distance from the tip of the heel
Correct answer
the spacing of the teeth
4) The first aid boxes should be properly equipped and kept in .................
right position
important places
machining area
easy access place
Correct answer
easy access place
5) Irregularly shaped workpiece are clamped on the lathe in ..................
faceplate
four jaw chuck
mandrel
collet chuck
Correct answer
faceplate
6) Which type of thread is used in the precision instrument?
BSW thread
Acme thread
BA thread
Square thread
Correct answer
BA thread
7) Three jaw chuck is also known as .............................
self-centering chuck
self chuck
union chuck
automatic chuck
Correct answer
self-centering chuck
8) What is used to measure the gap?
Thread gauge
Slip gauge
Taper ring gauge
Taper plug gauge
Correct answer
Slip gauge
9) The form of threads is used in the places where the sliding forces act in one direction, is .................
vee thread
square thread
trapezoidal thread
sawtooth thread
Correct answer
sawtooth thread
10) The hardest cutting tool material is ..................
stellite
cemented carbide
high-speed steel
diamond
Correct answer
diamond
11) What is used to test an external taper?
Taper plug gauge
Slip gauge
Taper ring gauge
Thread gauge
Correct answer
Taper ring gauge
12) The largest diameter of a screw thread is known as ...........
major diameter
minor diameter
normal diameter
pitch diameter
Correct answer
major diameter
13) The power is transmitted by the lead screw to the carriage through ...............
gear system
half nut
rack and pinion arrangement
pulley drive
Correct answer
half nut
14) In which operation on a workpiece on the lathe, the spindle speed will be least?
Parting off
Finishing
Taper turning
Thread cutting
Correct answer
Thread cutting
15) Steady rest is ....................
used when a lathe is subjected to vibrations
used while turning un-symmetrical objects
additional support provided for long jobs
used during thread cutting only
Correct answer
additional support provided for long jobs
16) The correct formula for the calculation of taper ratio ‘K’ is ...................
17) The work having finished hole is mounted on ..............
four jaw chuck
mandrel
faceplate
collet chuck
Correct answer
mandrel
18) Name the type of carrier shown in the figure.
Safe adjustable carrier
Adjustable carrier
Straight tail carrier
Bent tail carrier
Correct answer
Bent tail carrier
19) The basic function of cutting fluids is ............
cleaning and lubrication
cools the tool and the workpiece
cooling and flushing chips away from the cutting area
facilitating chip removal and lubrication
Correct answer
cools the tool and the workpiece
20) Name the type of knurling pattern illustrated in the figure.
Convex
Cross
Straight
Diamond
Correct answer
Straight
21) How many grades of slip gauges are recommended by BIS - IS: 2984?
2
3
4
5
Correct answer
4
22) Slip gauge designated with ‘Grade I’ is used for ................
calibration
inspection
reference
workshop
Correct answer
inspection
23) Name the part marked ‘X’ shown in the figure.
Lead screw
Bracket
Vertical shaft
Worm wheel
Correct answer
Worm wheel
24) What must be done to prevent the chuck from damaging the lathe guide-ways, while mounting?
Ask the instructor for help
Support with a screw jack
Place a wooden block or board on guide-ways
Lift the chuck with a hand crank
Correct answer
Place a wooden block or board on guide-ways
25) Which one of the following methods of thread catching is used to cut metric threads on a British lathe?
By reversing the machine
Marking reference lines on the headstock as well as on the lead screw
Using a chasing dial
By making the predetermined travel of the carriage on the bed
Correct answer
By reversing the machine
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