1) While step turning, it is preferred to turn first
small diameter step
large diameter step
either ‘a’ or ‘b’
neither ‘a’ nor ‘b’
2) Which one of the following types of chips is found while turning cast iron?
Spiral chips
Long curly chips
Segmental chips.
I-shaped chips
3) As the diameter of the workpiece decreases, the spindle speed (for the same cutting speed)
increases
decreases
remains the same
none of the above
4) The difference in measurement between the machined and un-machined diameter is equal to the
depth of cut
1/2 x depth of cut
2 x depth of cut
none of the above
5) Centre drilling should be done at
higher rpm with a slower feed
higher rpm with a higher feed
slower rpm with a higher feed
slower rpm with a slower feed
6) Which among the following is the cause for the incorrect pitch of thread during thread cutting with single point tool?
Incorrect selection of change gears
The lead screw is worn out
The half nut was worn out
Anyone of the above
7) Which one of the following is the reason for torn threads while thread cutting on the lathe?
Blunt tool
The heavy depth of cut
Insufficient side clearance
Anyone of the above
8) For the setting of the tool for threading, it is aligned with the work by using
template
thread plug gauge
try square
center gauge
9) Which among the following statements in respect of threads/ thread cutting is NOT correct?
Threading tools are checked for accuracy for the 600 angles by using a center gauge
M 10 x 1.25 is a fine pitch thread
M 10 is a coarse pitch thread
The same tool is used for cutting external and internal threads
10) While cutting internal threads on a lathe with single point tool, the spindle speed should be
less than that for the plain turning operations
more than that for the plain turning operation
equal to that for plain turning operation
None of the above
11) Which one of the following statements in respect of thread cutting is NOT correct?
Inserted tool bits are more advantageous while cutting internal threads
Before cutting internal threads, the hole should be chamfered
When internal thread cutting is done in a blind hole, a recess should be provided
When cutting internal threads, the core diameter may be equal to the size of external threads
12) Which among the following in respect of thread cutting is NOT correct?
The teeth of the driver and driven are based on the pitch of thread to be cut and the pitch of thread on the lead screw
The 127 teeth gear is used as a driven gear for cutting metric threads on a lathe having lead screw in TPI
The 63 teeth gear ¡s used as a driver for cutting British threads on a lathe having the metric lead screw
The threads can be cut on a lathe by using simple gear train arrangement only
13) Which one of the following statements in respect of eccentric turning is correct?
Higher speed is chosen for eccentric turning
It is preferred to give more depth of cut in the beginning while turning an eccentric shaft
The eccentric shaft can be turned by holding it in a three-jaw chuck
In an eccentric shaft, the centers of the individual diameters are displaced
14) Which one of the following statements in respect of thread chasing dial is NOT correct?
Thread chasing dial is used to catch the thread when threading on the lathe
Thread chasing dial stops rotating when the half nut lever is engaged
Thread chasing dial is an additional part of the lathe carriage
Worm gear of chasing dial engages with the lead screw while thread chasing
15) If the pitch to be cut is 2.5 mm and the lathe has 5 mm pitch lead screw, the thread chasing dial has 8 divisions and a 16 teeth worm wheel fitted on it, the engagement of half nut should be
only at one particular position
only at numbered or un-numbered division
at opposite position
anywhere
16) Which among the following statements is correct?
During turning, after giving one depth of cut, the diameter is reduced equal to double the depth
Carbide tipped tool can withstand shock load
When turning smaller diameter job, the rpm is proportionally decreased
When turning bigger diameter job, the rpm is proportionally increased
17) A 24-teeth gear is fixed at stud as driver gear. After completion of the first start and before starting of the second start, the driver gear should be turned
12 teeth
6 teeth
24 teeth
18 teeth
18)A simple gear train is to be used to cut a thread with a certain pitch. A driver gear with 3 teeth more than that of the calculated value is mounted due to the non-availability of the required gear from the set. The thread that is cut will have the pitch
Less than that required throughout the length
More for a certain length and then less for the remaining length
Equal to that required throughout the length
More than that required throughout the length
19) Power feed is not possible in compound slide method of taper turning. Which one of the following defects can be noticeable on the tapered workpiece due to the above reason?
Chatter
Taper angle more than set
Taper angle less than set
Poor surface finish
20) To get a fine even surface on a workpiece by facing operation on the lathe, it is necessary to have
low cutting speed, fine feed and heavy depth of cut
low cutting speed, fine feed and light depth of cut
high cutting speed, fine feed and light depth of cut
high cutting speed, fine feed and heavy depth of cut
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