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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 12
Q1 | Gears preferred for minimum axial thrust are
- Helical gears
- Worm gears
- Hypoid gears
- Herring bone gears
- Any of the above
Q2 | In case of springs in order to achieve greater load carrying capacity when the outer diameter is limited
- Square section is used
- Elliptical section is used
- Rectangular section is used
- Concentric springs are used
- None of the above
Q3 | In the Laminated springs, the flat plates of different lengths are provided for
- Reducing deflection
- Appearance
- Economy
- Equal distribution of stress
- Reducing bulk
Q4 | The most common material for the balls and races of ball bearings is
- High carbon steel
- High speed steel
- high chromium steel
- none of the above
- Cast steel
Q5 | A key seldom fails in
- Increasing the diameter of threaded portion
- tearing
- shearing
- crushing
Q6 | A suspended body is to be struck heavily without producing any reaction at the support. It should be hit at
- Centre of spin
- Centre of gravity
- Metacentre
- Centroid
- Centre of percussion
Q7 | Beams composed of more than one material, regidly connected so as to behave as one piece are known as
- determinate beams
- inditerminate beams
- Increasing the diameter of threaded portion
- composite beams
- compound beams
Q8 | Low pressure angle on gears is likely to result in
- Weaker teeth
- Abrasion
- Wear
- Pitting
- Stronger teeth
Q9 | The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be
- 6 cm
- 8 cm
- 12 cm
- 4 cm
- 10 cm
Q10 | The holding power of a saddle key is due to
- Torsion
- Shear force
- Compressive force
- Friction force
- Tensile force
Q11 | In order to minimise jerks, the type of cam used is
- Cycloidal
- Hyperbolic
- S.H.M.
- Cylindrical
- Parabolic
Q12 | Which of the following bearing will have least coefficient of friction?
- Cylindrical foller bearing
- Tapered bearing
- Single ball bearing
- Thrust ball bearing
- Self-aligning bearing
Q13 | Abrasion wear of gear tooth occurs due to
- Poor lubrication
- Fatigue
- Presence of foreign particles
- Excessive load
- Any of the above
Q14 | A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw is called
- castle nut
- jam nut
- sawn nut
- ring nut
- Increasing the diameter of threaded portion
Q15 | The angle through which a gear turns from the beginning of contact of a pair of teeth until the contact reaches the pitch point, is known as
- Angle of approach
- Angle of action
- Angle of contact
- Pressure angle
- Approach angle
Q16 | The surface endurance limit of gear material is dependent on its
- Toughness
- Surface hardness
- Surface lubrication
- Elastic strength
- Coefficient of friction
Q17 | Yield point in static loading as compared to that in fatigue loading is
- Depends on composition of material
- Same
- Lower
- Higher
- Depends on loading rate
Q18 | Slenderness ratio of the lacing bar for compression member should not exceed
- 125
- Increasing the diameter of threaded portion
- 100
- 175
- 145
Q19 | The value of load factor which accounts for margin of safety in plastic design for gravity loads is about
- 1.85
- 2.15
- Increasing the diameter of threaded portion
- 1.25
- 1.55
Q20 | The purpose of providing multiple collars on a flat collar pivot bearing is to
- Increase frictional resistance
- Establish self-substaining bearing condition
- Distribute the frictional load because of limiting frictional resistance
- Distribute the axial load becase of limiting bearing pressure on a collar
- None of the above
Q21 | Bolted joints often fail in
- tension only
- compresson only
- torsion only
- Increasing the diameter of threaded portion
- shear only
Q22 | A series of continuous spot welds
- dot matrix
- Increasing the diameter of threaded portion
- stitch weld
- butt weld
- seam weld
Q23 | A shaft coupling should
- hold the two shafts in perfect alignment
- have no projecting parts
- have all the above characteristics
- Cast steel
- transmit full power of the shaft
Q24 | Eye bolts are used for
- Locking devices
- Transmission of power
- Absorption of shocks and vibrations
- Lifting and transporting heavy pieces
- None of the above
Q25 | The most common material used for rivets is
- cast iron
- malleable cast iron
- mild steel
- none of the above
- Cast steel