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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 13
Q1 | Which of the following is a positive drive?
- Rope drive
- Flat belt drive
- Gear drive
- V-belt drive
- None of the above
Q2 | The critical speed of a shaft can be increased by
- shaft diameter may be increased
- bearings may be brought closer together
- Increasing the diameter of threaded portion
- frictionless bearings be used
- reciprocating load may be applied
Q3 | A chain drive is used for
- Distance is no criteria for such drives
- Medium distance
- Long distance
- Very short distance
- Short distance
Q4 | In a tap set, the first tap used in thread cutting is
- Any one
- Taper tap
- Straight tap
- Bottom tap
- Plug tap
Q5 | The pressure angle an involute gear profile gear
- Changes with position
- Depends on speed of operation
- Depends on gear pitch and clearance
- Remains constant
- None of the above
Q6 | When both pinion and gear are made of the same material, then from the design point of view
- Pinion is the determining factor
- Gear is the determining factor
- Any one of the two may be taken as determining factor
- Criteria is strength of any one of the teeth
- None of the above
Q7 | A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at
- Anywhere along the span
- Case should be analysed for various positions of load along the span
- Data should be taken from hand books
- End points
- Middle of span
Q8 | A belt when struck vibrates at a particular frequency determined by
- shape of bell
- size of ball
- material of bell
- All of the above
- Increasing the diameter of threaded portion
Q9 | In rolling bearings lubricant viscosity
- is decided on the basis of load
- decides the life of bearing
- is not determined by load
- Increasing the diameter of threaded portion
- is determined by operating speed
Q10 | Which dynamometer will be most suitable for measuring the BHP of an automobile engine?
- Electrical generator type
- Electrical resistance type
- None of the above
- Hydraulic type
- None of the above
Q11 | The property which refers to the relative ease with which a material can be cut is known as
- Malleability
- Stiffness
- Machinability
- Chrome steel
- Softness
Q12 | Fatigue failure starts at some
- hole
- Increasing the diameter of threaded portion
- star
- point
- discontinuity
Q13 | Sintered bearing
- Increasing the diameter of threaded portion
- high rpm applications
- find application is instruments
- are self-lubricating type suitable for placs where regular maintensance is difficult
- are used for under water applications
Q14 | Hysteresis and eddy current losses in bearings are typical to
- high speed bearings
- bearings for induction motors
- electromagnetic bearings
- Increasing the diameter of threaded portion
- foil bearings
Q15 | An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen
- The motor will not start
- The motor will run with peculiar noise
- The motor will get burnt
- The motor will not take load
- The operating speed of the motor will be less than the rated
Q16 | The buckling load depends on
- Modulus of elasticity
- Slendemess ratio
- Cross-sectional area
- All of the above
- None of the above
Q17 | The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be
- 47%
- 41%
- 25%
- 33%
- 55.50%
Q18 | The bearing used in railway wagons are
- Roller bearings
- Ball bearings
- Bush bearings
- Journal bearings
- Thrust bearings
Q19 | Which of the following operation causes residual compressive stress on the surface of the material?
- Surface rolling
- Shot peening
- Induction hardening
- All of the above
- Increasing the diameter of threaded portion
Q20 | Which type of bearing is provided at the big end of connecting rod?
- Ball bearing
- Needle bearing
- Cast iron bearing
- Roller bearing
- Ball bearing
Q21 | Which of the following fits can be used for selective assembly?
- Loose fit
- 10 kg
- Shrink fit
- Free fit
- Medium fit
Q22 | A block weighing 1000 kg rests on a horizontal surface. The coefficient of friction is 0.3 (both static and kinetic). What frictional force will be developed if the force applied to the block in the direction parallel to the horizontal surface is 40 kg
- 40 kg
- 33.33 kg
- 30 kg
- 10 kg
- 12 kg
Q23 | Which type of coupling will be preferred for connecting two shafts having relative speed?
- Flange coupling
- Flexible flange coupling
- Muff coupling
- Fluid coupling
- Any of the above
Q24 | As far as possible adhesive joints should be loaded in
- shear
- torsion
- compression
- Any of the above
- Increasing the diameter of threaded portion
Q25 | The basic shaft is
- One which has no upper deviation
- One which has no lower deviation
- One which has least deviation on both upper and lower side
- Does not exist
- None of the above