On This Page
This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on Machine Design Set 8
Q1 | A connecting rod in an IC Engine is to be designed against buckling. The end conditions considered are
- Both the ends fixed
- Both the ends are free
- Both the ends are hinged
- none of the above
- Cast steel
Q2 | A ball bearing cannot be provided for
- Big ends of connecting rods for I.C. engines
- Variable load shafts
- Variable speed shafts
- Automobile gear shafts
- Low speed shafts
Q3 | Which of the following drive has accurate speed ratio?
- Flat cross-belt drive
- Timing belt drive
- V-belt 'C' section drive
- V-belt 'B' section drive
- Increasing the diameter of threaded portion
Q4 | Under which condition a material ordinatily said to be ductile undergoes a fracture similar to that of a brittle material
- Cyclic loading at normal temperature
- Long time static loading at elevated temperature
- Impact loading specially at low temperatures
- All of the above
- None of the above
Q5 | When minimum axial thrust is the criteria, the choice of gears would been
- Helical gears
- Hypoid gears
- Herringbone gears
- Worm gears
- None of the above
Q6 | A compressed air cylinder carries approximately 70 kg/cm2 pressure at the time of delivery. The inside diameter is 25 cm. If the steel has a yield point of 2300 kg/sq cm and a safety factor of 2.5 the wall thickness should be
- 10 mm
- 15 mm
- 8 mm
- 12 mm
- 5 mm
Q7 | If during operation a boiler bursts, the matter should be reported to
- State Government
- Management
- Central Government
- Boiler inspector
- Police
Q8 | The compression members tend to buckle in the direction of
- Axis of load
- Perpendicular to the axis of load
- Minimum cross-section
- Least radius of gyration
- None of the above
Q9 | A concrete wall generally
- Absorbs and transmits sound
- Reflects sound
- Transmits sound
- Absorb sound
- Creates sound
Q10 | When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at
- Anywhere
- Shank
- Threaded portion
- Head
- Transition between head and shank
Q11 | Maximum efficiency expected in case of single mech supr gears is around
- 58%
- 98%
- 88%
- 68%
- 78%
Q12 | In a gas turbine rotor a radial stress of 300 kg/sq cm tensile and 500 kg/sq cm tangential stress have been found at a point. The maximum shear stress at this point would be
- 500 kg/cm2
- 250 kg/cm2
- 595 kg/cm2
- 750 kg/sq-cm
- 300 kg/cm2
Q13 | The life of ball bearings as listed in catalogue represents
- 25% survival rate
- 90% survival rate
- 50% survival rate
- 75% survival rate
- Increasing the diameter of threaded portion
Q14 | Rinkine-Gordon formula for buckling load is adopted for columns having slenderness ratio between
- 50 and 100
- 30 and 50
- 10 and 30
- 120 and 200
- Increasing the diameter of threaded portion
Q15 | Jaw clutches
- cause shock loads when engaging
- get disengaged at high rpm
- get disengaged in reverse direction
- are friction clutches which generate heat when enegaged
- Increasing the diameter of threaded portion
Q16 | A rack is a gear
- With infinite diametral pitch
- With infinite pitch circle diameter
- With infinite module
- With infinite number of teeth
- With infinite circular pitch
Q17 | Expansion joints are provided on pipes carrying
- Viscous fluids
- Water
- Air at pressures below atmospheric pressure
- Steam
- Air at high pressures
Q18 | The advantage of needle roller bearing over ball bearing is
- Less friction
- Less area requirement
- Smooth operation
- Large ratio of load capacity to size
- None of the above
Q19 | A V-belt designated as C 120 will have
- 120 mm as the dia of small pulley
- 120 cm as the length of belt
- 120 inch as the length of belt
- 120 cm as the centre distance between pulleys
- None of the above
Q20 | Dielectric strength of a material is
- Capacity to withstand high voltage
- Capacity to resist flow of current
- Capacity to take variable stresses
- Energy storage capacity
- Magnetic property
Q21 | According to IS 800, the lacing bars should resist a transverse shear equal to
- 7.50%
- 2.50%
- Increasing the diameter of threaded portion
- 17.50%
- 12.50%
Q22 | The bunkers are the containers in which the plan of rupture intersects
- the opposite face (wall) near the bottom
- Increasing the diameter of threaded portion
- the opposite face (wall) near the top
- the bottom surface of material stored
- the top surface of material stored
Q23 | Laser treatment of components increases fatigue resistance of metals by
- compressing holes
- filling vacancies
- freezing discontinuities
- none of the above
- Increasing the diameter of threaded portion
Q24 | Failure of rolling bearings occurs mainly due to
- lubrication failure
- fatigue
- load and deformation
- Increasing the diameter of threaded portion
- plastic deformation
Q25 | In elevated circular steel tanks, conical bottoms are attached when
- Increasing the diameter of threaded portion
- water is alkaline
- water is oily
- water is acidic
- water is muddy