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WorksheetsDAY 32 WORKSHEET KWA (Mechanical Fasteners)
Total questions: 15
Worksheet time: 9mins
Which locking device relies on elastic deformation to maintain clamping pressure under vibration?
Lock nut
Castle nut
Spring washer
Dog-point screw
The slot width in a sawn (Wiles) nut is typically —
0.10d
0.15d
0.25d
0.35d
Which foundation bolt is removable without damaging masonry?
Rag bolt
Cotter bolt
Lewis bolt
Anchor lug bolt
Which weld is MOST suitable for joining two thin plates edge-to-edge with minimal reinforcement?
Plug weld
Groove weld
Edge weld
Backing weld
An eccentric reducer is preferred over a concentric reducer because —
It has higher pressure rating
It avoids air/solid pocket formation
It provides better aesthetics
It reduces turbulence
TRUE OR FALSE
Castle nuts differ from slotted nuts mainly because of the cylindrical projection with semi-circular slots on top.
(a)
TRUE OR FALSE
A flanged pipe joint is permanently fixed and cannot be dismantled after installation.
(a)
Assertion (A): Lewis foundation bolts can be reused multiple times during machinery installation. Reason (R): They are held by taper fit and unlocked using a gib head key instead of molten lead.
A True, R True and R explains A
A True, R True but R not explanation
A True, R False
A False, R True
The thickness of a lock nut (jam nut) is generally (a)
In a slotted nut, the slot width is approximately (a)
The type of bolt used for masonry foundation fixing with molten lead is called a .
(a)
A slot weld is similar to a plug weld but uses an (a)
The fitting used to disconnect a pipe without rotating it is called a .
(a)
MATCH THE FOLLOWING
Locking Devices → Method
A. Slotted nut→4. Set screw presses against groove
B. Castle nut→1. Nylon/fibre ring provides locking
C. Simmond’s nut→2. Split pin through slots in shroud
D. Sawn (Wiles) nut→3. Split pin through hexagonal slots
A–3, B–2, C–1, D–4
A–2, B–3, C–1, D–4
A–3, B–1, C–2, D–4
A–3, B–2, C–4, D–1
Pipe / Weld Concepts → Application
A. Plug weld→3. Allows thermal expansion in pipelines
B. Socket & spigot joint→4. Avoids air pockets on top generatrix
C. Eccentric reducer→1. Fills drilled opening to join plates
D. Expansion joint→2. Underground CI water mains
A–2, B–1, C–4, D–3
A–2, B–1, C–4, D–3
A–1, B–2, C–3, D–4
A–1, B–2, C–4, D–3
