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This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 9
Q1 | Small steel balls are manufactured by
- Cold heading
- Casting
- Rolling
- Turning in lathe
- Spinning
Q2 | The casing of a water pump is generally
- Made of soft material
- Made of hard material
- Made of chilled cast iron for water resistance
- Made of non-ferrous materials
- None of the above
Q3 | Bush bearings are
- Phosphor bronze
- Aluminium brass
- Mild steel
- White metal alloys
- None of the above
Q4 | In a cotter joint in order to ensure that cotter does not work back
- The taper on cotter should not exceed 1 in 24
- Cotter should be made of stronger material
- The taper on cotter should be more than 1 in 24
- Cotter should be made thick
- Shear pins should be applied on the cotter
Q5 | Cold working of materials
- Increases the fatigue strength
- Reduces the fatigue strength
- Does not change fatigue strength
- Has no effect on fatigue trength
- None of the above
Q6 | A motor weighing 2000 kg is to be lifted by wrought iron eye bolt, screwed into the frame. Clioose-single bolt out of the following
- M 30 coarse threads
- M 12 fine threads
- None as wrought iron is brittle
- M 12 coarse threads
- M 30 Fine threads
Q7 | An induction motor stator is cooled by
- Air
- Water
- Hydrogen
- Air and water
- None of the above
Q8 | The following property is the most important for normal used for gas turbine blades
- Increasing the diameter of threaded portion
- Resistance to bending
- Creep
- Fatigue
- Resistance to shear
Q9 | The efficiency of a screw track is maximum when its helix angle '?' is equal to
- 45 - ?
- 45 - ?/2
- Increasing the diameter of threaded portion
- 45 + ?/2
- 45?
Q10 | When a section of a beam is plastified due to given system of loading then
- the length of beam over which the moment is geater than or equal to the yield moment is plastified
- only one section of beam is plastified
- the whole length of beam is plastified
- Increasing the diameter of threaded portion
- the length of beam over which the moment is less than the yield moment is plastified
Q11 | Normally a spring operates within
- Visco-elastic limits
- Plastic limits
- Para-elastic limits
- Elasto-plastic limits
- Elastic limits
Q12 | Non-metallic gears have
- Low noise at higher speeds and low load carrying capacity
- High noise at higher speeds and high load carrying capacity
- Low noise at higher speeds and high load carrying capacity
- Cannot be operated at higher speed.
- All of the above
Q13 | What should be the thickness of a cast iron pipe 45 cm diameter if it is required to sustain 6 kg/sq cm inside pressure ? The maximum stress in the pipe material being limited to 140 kg/cm2
- 12 mm
- 10 mm
- 7.5 mm
- 5 mm
- 15 mm
Q14 | A stud is
- Screw with cylindrical head
- Headless scew
- Screw with circular heads
- Oval heads screw
- Screw with long threads
Q15 | Which of the following is a positive clutch?
- Increasing the diameter of threaded portion
- Band cluch
- Jaw clutch
- Disc clutch
Q16 | In case of spur gears the higher pressure angle results in
- Wider base and stronger teeth
- Weaker teeth
- Narrow base and weaker teeth
- Non-uniform motion transmission
- Begger size of gear
Q17 | The pitch circle of a cam is
- The smallest circle drawn to the pitch curve
- Thesmallest circle drawn to the cam profile from the centre of rotation of a radial cam
- The circle fitting in the cam profile
- The circle with centre as the centre of cam axis and radius such that it passes through the point
- None of the above
Q18 | If during operation of a boiler one of the riveted joints is found leaking
- The boiler is stopped immediately
- All the riveted joints are reopened and gain riveted
- Depending upon the zone of boiler in which the joint leaks, decision is taken
- The joint is repaired if in low pressure zones otherwise boiler sent for repairs
- None of the above
Q19 | When a nut is tightened by placing a washer below it, the bolt will be subjected to
- Tension
- Torque
- Compression
- BI-axial stress
- Shear
Q20 | In case of Vee belt
- The belt should not touch the bottom of groove in the pulley
- The belt should touch the bottom of groove in the fulley
- The efficiency of transmission is less
- Grooves in the pulley are generally wider than the belt
- Tension in belt remains constant throughout
Q21 | Which of the following is not the advantage of V-belts over flat belts?
- Less shock load absorption
- Less axial space requirement
- Increasing the diameter of threaded portion
- Less slippage
- Less noisy
Q22 | The curve traced by a point on a line as the line rolls on another curve is known as
- Cycloid
- Involute
- Hypocycloid
- Hyperbola
- Epicycloid
Q23 | The included angle in Acme threads is
- 60?
- 55?
- 50?
- 29?
- 47
Q24 | The differential equation 10x + 200 x + 810x = 0 describes one degree of freedom system. The system is
- Oscillatory
- Having critical damping
- Having more than critical damping
- Having less than critical damping
- None of the above
Q25 | A column has its equivalent length equal to its length in case of
- one end fixed, other free
- both end fixed
- one end hinged and one fixed
- both ends hinged
- Increasing the diameter of threaded portion