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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 4
Q1 | In a bolt the plane of shear
- Should be across threaded portion of the shank
- Should never be acress threaded portion of the shank
- Should be parallel to the axis of bolt
- Should be normal so the threaded portion of the shank
- None of the above
Q2 | In case of rivets, the countersunk heads are used to
- connect unequal sections
- Increasing the diameter of threaded portion
- provide a fluish surface
- connect structural members
- connect different materials
Q3 | Bolts in structures are often tightened
- upto 90% of yield point
- below yield point
- Increasing the diameter of threaded portion
- upto breaking point
- upto or beyond yield point
Q4 | Which of the following key permits axial relative motion between the shaft and the hub?
- Wood ruff key
- Square key
- Increasing the diameter of threaded portion
- Gib headed key
- Feather key
Q5 | The moment-cuvature relation at a plastic hinge is
- is a constant curvature for all moments
- a constant moment for different curvatures
- Increasing the diameter of threaded portion
- always linear
- always linear
Q6 | A simple supported steel beam when loaded with a force of 100 kg at A is found to deflect 10 mm at B. What force at B would cause a deflection of 2.5 mm at A
- 10 kg
- 50 kg
- 100 kg
- 400 kg
- 25 kg
Q7 | Acoustical materials
- Create sound
- Create and reflect sound
- Absorb sound
- Reflect sound
- Absorb and reflect sound
Q8 | Fatigue strength of a surface may be increased by
- Applying concentrated hydrochloric acid on the surface
- Applying birine on the surface and then washing with cold water
- Making surface rough
- Filling the surface
- Polishing the surface
Q9 | The function of gear box in an automobile is
- To provide variable speeds
- To reduce speed
- To increase speed
- To produce torque
- To increase efficiency
Q10 | A unknown weight falls through 1 cm on a collar rigidly attached to the lower end of a vartical bar 3 cm long and 6 cm2 in section. If the maximum instantaneous extension is 2 mm the value of stress would be
- 1333 kg/cm2
- 1000 kg/cm2
- 667 kg/cm2
- 1500 kg/cm2
- 500 kg/cm2
Q11 | Which is the heaviest metal?
- Mild steel
- Lead
- Platinum
- Gold
- High speed steel
Q12 | Braking system used on aircraft is
- Pneumatic
- Regenerative
- Plugging
- Hydraulic
- Mechanical
Q13 | A fine series screws of major diameter 8 mm and pitch 1 mm is generally designated as
- M 8 x 1
- 8 x M 1
- 8 x 1 M
- 8 M
- 8 M 1
Q14 | In order to avoid interference for 20 pressure and teeth, minimum number of teeth should be
- 8
- More than 18
- 12
- More than 24
- 16
Q15 | The bursting pressure of 12 mm ID, 14 mm OD seamless cartridge brass tubing having ultimate whear stress of 225 Mpa, will be nearly
- 40 Kpa
- Increasing the diameter of threaded portion
- 20 Kpa
- 10 Kpa
- 30 Kpa
Q16 | Web crippling in beams generally occurs at points where
- concentrated load occurs
- deflection is maximum
- Increasing the diameter of threaded portion
- shear force is maximum
- bending moment is maximum
Q17 | Oldham's coupling is used to cannect two shafts which
- Are not in exact alignment
- Have two axes intersecting
- Have lateral misalignment
- Have lateral movement during power transmission
- Changes axes during power transmission
Q18 | Smooth bearing surface is an essential pre-requisite in case of
- thin-film lubrication
- thick film lubrication
- both film (A) and (B) above
- none of the above
- Increasing the diameter of threaded portion
Q19 | Machines screws are
- Generally provided with head longer than that of a normal screw
- Headless
- Provided with slotted head and used with a nut
- Screws with button-head
- Screws with rounded head
Q20 | The wrist pin of diesel engine is always in
- Increasing the diameter of threaded portion
- a tresss free from shear
- single shear
- double shear
Q21 | Which type of loading should be avoided
- Cleavage loading
- Shear loading
- Tensile loading
- none of the above
- Increasing the diameter of threaded portion
Q22 | For traction applications, the type of motor best suited is
- Synchronous motor
- Induction motor
- DC series motor
- DC compound motor
- DC shunt motor
Q23 | Splined shafts are commonly used in
- Machine tools
- Bicycles
- Aircraft
- Automobiles
- None of the above
Q24 | The locomotive wheel tires are fitted as
- Wringing fit
- Loose fit
- Free fit
- Snug fit
- Shrink fit
Q25 | Lag bolts are generally used
- for fastening castings
- Increasing the diameter of threaded portion
- in wooden construction
- for tapping holes
- in electrical equipment