SCREW THREADS MCQ
SCREW THREADS MCQ
1) The pitch of 3-start thread is the lead divided by
1
4
2
3
Correct Answer- (D)
2) The distance through which a screw thread advances axially in one turn is called:
Depth of thread
Diameter of thread
Lead of thread
Pitch of thread
Correct Answer- (C)
3) The angle of l.S. thread (V-shaped) is
29°
47.5°
50°
60°
Correct Answer- (D)
4) What type of threads are suitable for small precision components and measuring gauges?
Acme threads
Whitworth Screw threads
British Association threads
Square threads
Correct Answer- (C)
5) What type of threads are suitable for lead screws of machine tools?
British Association threads
Whitworth Screw threads
Acme threads
Square threads
Correct Answer- (C)
6) Which one of the following is the reason for rough and broken threads?
Thread cuting tool blunt.
The size of hole or diameter of the blank for bolt is not correct.
The flutes of cutting tool are filled with chips.
All the above.
Correct Answer- (D)
7) The distance between one point on a screw thread and the corresponding point on the next thread, measured parallel to the axis is called as
Depth of thread
Axis of thread
Pitch of thread
Lead of thread
Correct Answer- (C)
8) In a single start thread *
5 points
Lead and pitch are equal
Lead is double the pitch
Pitch is double the lead
Lead is half the pitch
Correct Answer- (A)
9) Which one of the following screw thread forms has an included angle of 29° between the flanks of thread?
Knuckle thread
A. thread
Buttress thread
Acme thread
Correct Answer- (D)
10) The pitch diameter of the external screw thread is checked by
Vernier caliper
Thread ring gauge
Screw thread micrometer
Screw pitch gauge
Correct Answer- (C)
11) A screw thread is formed on a cylindrical surface by cutting
V grooves
Half round grooves
Helical grooves
Square grooves
Correct Answer- (C)
12) The root of ISO metric thread is
Flat
Round
Sharp corner
None of the above
Correct Answer- (B)
13) Which one of the following thread forms is used in a threaded assembly where the sliding force acts in one direction only?
Square thread
Saw-tooth thread
Knuckle thread
‘V’ thread
Correct Answer- (B)
14) B.S.F. screw threads have the included angle of
30°
45°
55°
60°
Correct Answer- (C)
15) The depth of B.A. screw thread is …..
O.7035 P
0.6 P
0.61 P
0.64 P
Correct Answer- (B)
16) The pitch diameter of a screw thread is the
Maximum diameter of the thread
Imaginary diameter in between the major and minor diameter of the thread
Nominal diameter of the rod
Minimum diameter of the thread
Correct Answer- (A)
17) B.S.F. screw threads are generally used for
Electrical goods
Vice spindle
Lathe lead screw
Ordinary bolts and nuts
Correct Answer- (A)
19) Screw threads are produced without metal removing by a process called as
Thread cutting
Thread chasing
Tapping
Thread rolling
Correct Answer- (D)
20) Which one of the following thread forms on bolts and nuts is meant for general fastening purposes?
‘V’ threads
Square threads
Acme threads
Knuckle threads
Correct Answer- (A)
21) Which one of the following elements of an external screw thread cannot be measured directly with precision instruments ?
Width of crest
Major diameter
Pitch diameter
Minor diameter
Correct Answer- (C)
22) Which one of the following screw thread elements is NOT checked with the thread ring gauge?
Profile
Pitch diameter
Helix angle
Pitch
Correct Answer- (B)
23) Which one of the following statements is correct with respect to the spiral fluted taps?
Used to tap oversized hole
Used to tap holes with slots
The tap tends to push the chips ahead of the tap
Threads formed by displacing the work material
Correct Answer- (B)
24) The shape of the frame of thread snap gauge is in the form of ………
Round
Square
‘Y’ type
“C” type
Correct Answer- (D)
25) The shape of the thread in the ‘Not Go’end of a thread snap gauge is
Beveled
Truncated
Taper
Sharp
Correct Answer- (B)
26) The handle of thread plug gauge is made from ebonite material for
easy handling
reducing the weight
reducing the cost
easy manufacturing
Correct Answer- (B)
27) Which one of the following thread groups is only for transmitting motion?
ISO Metric, Modified Square, Acme threads
Unified, Acme, Square threads
Square, Modified squàre, Acme, Buttress threads
Whitworth, Acme, Square, Buttress threads
Correct Answer- (C)
28) Buttress threads are most commonly used for
Positioning of mechanical parts
Special bolts and units in structural work
Resisting force exerted in one direction only
Transmission of motion
Correct Answer- (C)
29) While threading on lathe, the carriage is moved by means of
Gear train on a rack
Feed rod
Hand wheel
Lead screw
Correct Answer- (D)
30) The depth of Indian Standard (BIS) thread is
0.6495 P
0.6000 P
0.6403 P
0.6134 P
Correct Answer- (D)
31) Threads are cut on a lathe with a single point tool by
Setting the correct speed
Moving the carriage by means of rack.
Making a series of cuts in the same cut
Setting on cut for the full depth of the thread.
Correct Answer- (C)
32) Which one of the following thread forms is mostly found on threaded shaft of lifting equipment for carrying loads?
Knuckle thread
Square thread
Saw tooth thread
‘V’ thread
Correct Answer- (B)
33) In a threaded assembly the contact between the male and female threads takes place on the
Pitches
Flanks
Roots
Crests
