1) Which one of the following is used to rectify damaged or rusted threads?
Die nut
Die plate
Circular split die
Two-piece die
Correct answer
Die nut
2) What is used for removing a broken tap?
Tap nut
Tap disposer
Tap extractor
Tap wrench
Correct answer
Tap extractor
3) Which coolant is recommended for tapping copper or aluminum?
Lard oil
Soda water
Dry ice
Kerosene
Correct answer
Kerosene
4) A drilled hole goes out of center due to
Improper clamping of the workpiece
Workpiece having blowholes
Centre punch mark not being large enough to give the proper seat to the chisel edge of the drill
Anyone of the above
Correct answer
Anyone of the above
5) A Ø 6H7 hole is to be reamed in a steel workpiece What size of the drill will be required?
5.5 mm
5.8 mm
6.0 mm
6.2 mm
Correct answer
5.8 mm
6) A screw thread is designated as 1” B.S.P. thread, what does 1” indicate?
The hole diameter of the pipe
The minor diameter of a thread
The major diameter of a thread
The pitch diameter of a thread
Correct answer
The hole diameter of the pipe
7) The following method(s) is (are) used to measure the minor diameter of internal threads
a) Taper parallels methods
b) Calibrated rollers methods
c) Both (a) & (b)
d) None of these
Correct answer
c) Both (a) & (b)
8) Which one of the following thread forms are provided in the threaded parts where the pressure acts on one flank of the threads during transmission?
Knuckle thread
Buttress thread
V thread
Square thread
Correct answer
Buttress thread
9) The largest diameter of a screw thread is known as................
Major diameter
Minor diameter
Pitch diameter
Normal diameter
Correct answer
Major diameter
10) To check the external diameter of the hole, we use
Ring gauge
Slip gauge
Plug gauge
Standard screw pitch gauge
Correct answer
Ring gauge
11) ‘GO’ and ‘NO GO’ gauge is a type of
Ring gauge
Plug gauge
Limit gauge
Slip gauge
Correct answer
Limit gauge
12) A positive allowance will always result in a ………………. fit.
a) Clearance
b) Interference
c) Both (a) & (b)
d) Any of these
Correct answer
a) Clearance
13) Induction hardening process involves
Heating surface by induction in the field of invariable current
Case depth minimum of 2 mm are produced
Heating surface by induction in the field of alternating current
None of these
Correct answer
Heating surface by induction in the field of alternating current
14) The error of measurement =
a) True value — Measured value
b) Precision — True value
c) Measured value — Precision
d) None of these
Correct answer
a) True value — Measured value
15) Which method gives accurate results when the effective diameter is measured without considering the thread angle?
a) Two wire method
b) Three wire method
c) Best wire size
d) All of these
Correct answer
Best wire size
16) Which of the following is a surface finishing operation?
Milling
Drilling
Turning
Lapping
Correct answer
Lapping
17) The largest amount of material is used in
Superfinishing
Lapping
Honing
Buffing
Correct answer
Honing
18) Which of the following process has the lowest cutting speed?
Honing
Turning
Drilling
Milling
Correct answer
Honing
19) Which of the following process has the lowest metal removal rate?
Lapping
Milling
Drilling
Reaming
Correct answer
Reaming
20) During a honing process, the reciprocating speed of the honing tool was 9m/min with a rotary speed of 25m/min. Crosshatch angle is equal to
30°
35°
25°
40°
Correct answer
40°
21) The following operation is performed after polishing.
Tumbling
Burnishing
Buffing
Superfinishing
Correct answer
Buffing
22) In which of the following processes, highly polished steel balls are used instead of abrasive
Honing
Lapping
Polishing
Burnishing
Correct answer
Burnishing
23) Scale and sharp edges are removed in
Honing
Tumbling
Burnishing
Lapping
Correct answer
Tumbling
24) Which of the following are functions of bearings?
a) Ensure free rotation of the shaft with minimum friction
b) Holding shaft in a correct position
c) Transmit the force of the shaft to the frame
d) All of these
Correct answer
d) All of these
25) The fire triangle in fire hazards is identified as
Fuel, oxygen & heat
Fuel, burning and solid
Fuel, oil, and waste
Fuel, liquid, and vapor
Correct answer
Fuel, oxygen & heat
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