On This Page
This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 7
Q1 | The weakest plane in a fillet weld is
- the throat
- smaller of the sides
- side normal to the force
- side parallel to the force
- Increasing the diameter of threaded portion
Q2 | The holes in plates for reveting are usually made by
- Arc cutting
- Oxyacetylene flame
- Punching
- Drilling
- Any of the above
Q3 | Which of the following treatment is often recommended for parts operating under corrosive conditions?
- strain-aging
- tempering
- normalising
- all of the above
- Increasing the diameter of threaded portion
Q4 | A material is generally classified as brittle if the percentage elongation (in a gauge length of 50 mm) is less than
- Chrome steel
- 1%
- 2%
- 5%
- 15%
Q5 | A flange coupling is
- Used for non-collinear shafts
- Used for collinear shafts
- Flexible
- Used only on small shafts rotating at slow speeds
- None of the above
Q6 | Splines are used when
- Axial relative motion between shaft and hub is necessary
- The torque is high
- The power to be transmitted is high
- rpm are high
- The power to be transmitted is low
Q7 | Bolts in structures are often tightened upto or beyond the yield point because
- frction is more beyond yield point thus providing a firm joint
- temperature variations may loosen the joint
- it improves endurance strength
- all of the above
- Increasing the diameter of threaded portion
Q8 | A triple threaded worm has a pitch diameter of 100 mm and an axial pitch of 22 mm. The lead angle will be
- tan-1 0.21
- tan-1 0.66
- tan-1 0.22
- tan-1 0.3
- tan-1 0.36
Q9 | Spigot and socket joints are used on pipes
- Which are buried underground
- Carrying air at pressure above atmospheric pressure
- Carrying steam under high pressure
- Carrying high pressure fluids under high pressure
- Carrying air at pressure below atmospheric pressure
Q10 | In a compression test the fracture in cast iron specimen would occur along
- An oblique plane
- Along the axis of the load
- At right angles to the specimen axis
- Fracture will not occur in cast iron
- None of the above
Q11 | If the allowable shear stress is 960 kg/sq. cm for the size h cm, the allowable force per cm of weld length would be
- 670 h
- 475 h
- 315 h
- 400 h
- 950 h
Q12 | In case of a knuckle joint the pin is likely to fail in
- Tension
- Crushing
- Double shear
- Compression
- Shear
Q13 | Shot peening leaves the material surface in
- residual tensile stress
- residual shear stress
- residual compressive stress
- All of the above
- Increasing the diameter of threaded portion
Q14 | A Babbit is
- A gadget for measuring volume
- A measure of magnetic induction produced in a material
- A eutectic of iron and iron phosphide
- None of these
- Antimony bearing lead or tin alloy
Q15 | Low pressure angle on gears results in
- Weaker teeth
- stronger teeth
- abrasive wear
- none of the above
- Cast steel
Q16 | An eye bolt is generally provided on
- Furnaces
- Bench vices
- Electric motors
- Overhead cranes
- All of the above
Q17 | The satisfactory method of reclaiming worn out and under sized part subject to fatigue loads is
- Repainting
- Polishing
- Electroplating
- Recasting
- None of the above
Q18 | The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is
- 1 micron
- 10 micron
- 0.01 micron
- 0.1 micron
- 100 micron
Q19 | Dead weight type safety valve is not used on locomotives because
- It is costly
- It is susceptible to vibratory forces
- It is not reliable
- It is bulky
- It gives bad apparatus
Q20 | Extrafine threaded connections are generally recommended for
- Increasing the diameter of threaded portion
- Rolled sections
- hardened objects
- thin walled assemblies
- Tapped hole in castings
Q21 | A square key is
- Equally strong in shear and compression
- Very weak in shear
- Less strong in shear and more strong in compression
- More strong in shear and less strong in compression
- Very weak in compression
Q22 | A steel specified as St 50 will have a tensile strength of approximately
- 50 tonnes/m2
- 50 kg/mm2
- 50 kg/cm2
- 50 tonnes/mm2
- None of the above
Q23 | The chain used in motor cycles is generally
- Ewast type
- Silent type
- Double roller type
- Bush roller type
- Pintle type
Q24 | In gear design, addendum is equal to
- Cast steel
- Twice of module
- One and a half times module
- Module
- Half of module
Q25 | Lubricant is not required in
- Increasing the diameter of threaded portion
- Electromagnetic bearing
- Hydrostatic bearings
- Gas bearings
- Foil bearing