WorksheetsFasteners and Threading Quiz
Total questions: 73
Worksheet time: 37mins
The top point of the thread is known as:
Crest
Root
Flank
What is a headed bolt with a threaded end and a corresponding locking nut called?
Stud bolt
Standard bolt
Anchor bolt
The lowest part between two threads is called the:
Crest
Root
Pitch
The slope between the crest and the root of a thread is called the:
Flank
Lead
Pitch
The angle between two adjacent flanks is called the:
Thread angle
Crest angle
Lead angle
The diameter between the male crest and the female root is the:
Effective (Pitch) diameter
Major diameter
Minor diameter
The largest diameter of a screw thread is the:
Major diameter
Minor diameter
Pitch diameter
The number of threads per inch in a screw thread defines the:
Thread pitch
Thread standard
Thread count
A screw pitch gauge is used to measure:
Thread depth
Number of threads per inch
Thread angle
The code marking on a bolt head indicates:
Bolt length
Bolt material and strength
Bolt type
Washers are used to:
Prevent damage and distribute the load
Tighten nuts
Lock threads in place
A rod threaded at each end and plain in the middle is called:
Stud
Bolt
Screw
Screws that form their own thread are called:
Self-tapping screws
Set screws
Machine screws
Standard airframe bolts are made from:
Mild steel
High tensile steel
Brass
Thin plain nuts tightened down on the main nut are called:
Check nuts
Castle nuts
Wing nuts
High-temperature self-locking nuts are used where:
Vibration is low
Temperatures exceed normal nylon nut limits
No locking device is needed
Wire thread inserts are used to:
Protect holes in soft metal from wear
Reduce bolt length
Increase thread diameter
Locking devices are used to:
Prevent nuts and bolts from loosening
Reduce torque
Increase bolt length
Safety wiring prevents:
Loosening of bolts due to vibration
Over-tightening
Corrosion
Toothed washers provide:
Locking friction
Electrical bonding only
Load distribution
Quick-release fasteners are designed for:
Rapid installation and removal
Permanent joints
Sealing hydraulic leaks
A quick-release fastener is built from:
Receptacle, grommet, retaining ring, stud assembly
Bolt and nut
Rivet and washer
A key used between shaft and hub is to:
Transmit torque
Reduce friction
Absorb vibration
A spring is an engineering component that:
Returns to its original shape after deflection
Becomes permanently deformed
Expands under compression
Bearings are used to support:
Radial and axial loads
Bending loads only
Thermal expansion
Bearing play is the:
Clearance between rolling elements and races
Frictional torque
Lubricant type
Typical bearing elements include:
Inner race, outer race, rolling elements, and cage
Shaft and hub
Grease and seal only
Combined radial and axial loads are handled by:
Angular contact bearings
Plain bearings
Ball thrust bearings
To change the direction of motion, use:
Gears or pulleys
Stud bolts
Lock washers
Transmission elements such as chains and belts are used to:
Transmit motion and power between shafts
Support axial load
Provide locking
Chain wheels are used to:
Connect two shafts
Tighten cables
Drive propellers
V-belts and flat belts run on:
Pulleys
Bearings
Keys
Helical gears are more silent than:
Straight-cut gears
Chain drives
Bevel gears
Flexible control cables are constructed from:
7 strands, 19 wires per strand
19 strands, 7 wires per strand
12 strands, 20 wires per strand
End fittings are used to:
Guide control cables and prevent contact with structure
Measure cable tension
Adjust lever length
Pressure seals in control systems are used to:
Prevent air or fluid leakage
Lock control rods
Reduce friction
Cable tension must be kept constant:
At all temperatures
Only at ambient temperature
Only in hot conditions
Motion is transmitted through:
An inner cable within a protective outer conduit
A solid rod
A hydraulic line
The torsion drive converts:
Pull to rotational motion
Rotation to lift
Electrical to mechanical energy
A gear wheel enclosed in a junction box forms part of:
A torsion drive mechanism
A pulley system
A clutch
A close-coiled spring covered with cotton and waterproof coating is used in:
Control cable systems
Engine mounting
Hydraulic filters
High carbon spring steel is used for:
Springs and locking devices
Bearings
Rivets
CRES stands for:
Corrosion Resistant Steel
Chromium Reactive Steel
Cold Rolled Engineering Steel
Journals of shafts and axles are:
Bearing contact surfaces
Locking devices
Fasteners
Lock wire is always installed so that:
Tendency to loosen is counteracted by tightening of wire
Both parts loosen together
Wire remains slack
What does a castellated nut require to secure it properly?
Split pin or cotter pin
Lock washer
Locking compound
What prevents a self-locking nut from loosening under vibration?
Friction from insert or deformation
Safety wire
Tight torque alone
What tool is used to measure bolt thread pitch?
Screw pitch gauge
Micrometer
Vernier caliper
Bolts with a drilled head are typically used for:
Safety wiring
Reducing weight
Alignment
What should be done if a bolt hole becomes elongated or worn?
Use a wire thread insert
Enlarge the hole
Use a longer bolt
A ‘Quick Release Fastener’ such as a Dzus is designed for:
Panels requiring frequent removal
Permanent joints
Electrical connections
When using a split pin, its head should be positioned:
On top of the nut
Facing the direction of rotation
On the flat surface of the bolt
The major advantage of helical coil inserts is:
Restores damaged threads to full strength
Prevents corrosion
Improves torque
When safety wiring two or more bolts, the wire must be:
Installed so that tightening of one tightens the other
Loose to allow movement
Installed in the opposite direction of tightening
The purpose of washers with serrations or teeth is to:
Provide locking friction
Prevent corrosion
Increase thread engagement
Which type of nut is not used above 120°C due to nylon melting?
Self-locking (nylon insert) nut
Castle nut
Check nut
What is the correct torque practice when installing a bolt?
Torque the nut, not the bolt head
Torque both ends equally
Torque the bolt head only
What ensures alignment of castellated nut slots and bolt holes?
Adjusting torque within tolerance
Using an extra washer
Filing the nut
Ball bearings are designed to support:
Both radial and thrust loads
Torsional loads only
Axial loads only
Roller bearings are mainly used for:
High radial loads
Low-speed control surfaces
Electrical connections
Which bearing type is suitable for limited oscillating motion?
Needle roller bearing
Spherical bearing
Deep groove
A pulley in an aircraft control system is used to
Change direction of control cable movement
Lock the cable
Increase tension
In a flexible cable control system, motion is transmitted through
Inner cable and outer casing
Two solid rods
A spring-loaded bar
To prevent moisture and dirt entering flexible controls
Pressure seals
Rubber washers
Felt pads
Cable tension regulators ensure
Constant tension at varying temperatures
High friction
Cable shortening
torsion drive transmits motion through
A coiled spring
A chain
A rod linkage
The purpose of a ball end fitting on a cable is
To attach the cable to levers or bellcranks
To secure safety wire
To measure tension
Control cable inspection should focus on
Wire diameter only
Broken wires, corrosion, and wear
Cable color
Flexible cable coverings made of cotton braiding and waterproof coating provide
Electrical insulation
Protection from moisture and wear
Strength only
The metric analogue of the Unified thread is being developed by
ANSI
ISO
IOS
Bevel gears are used for:
Parallel shafts only
change direction
Flexible shafts
Chain drives are preferred over belts when
Slip is desired
Positive, no-slip drive is needed
Quietness is priority
Pulleys should be aligned to
Minimize cable/ belt wear and friction
Encourage rubbing
Increase tension
