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This set of Design of Machine Elements Multiple Choice Questions & Answers (MCQs) focuses on Design Of Machine Elements Set 12
Q1 | If E = Mean kinetic energy of the flywheel, CS = Coefficient of fluctuation of speed and Δ E = Maximum fluctuation of energy, then
- Δe = e / cs
- Δe = e2 × cs
- topic 4.2 flywheels considering stresses in rims and arms for engines and punching machines
Q2 | The ratio of the maximum fluctuation of energy to the ……. is called coefficient of fluctuation of energy.
- minimum fluctuation of energy
- workdone per cycle
- maximum fluctuation of energy
- none of the mentioned
Q3 | Due to the centrifugal force acting on the rim, the flywheel arms will be subjected to
- tensile stress
- compressive stress
- shear stress
- none of the mentioned
Q4 | The tensile stress in the flywheel rim due to the centrifugal force acting on the rim is given by
- ρ v2/4
- ρ v2/2
- 3ρ v2/4
- ρ v2
Q5 | The cross-section of the flywheel arms is usually
- elliptical
- rectangular
- i-section
- l-section
Q6 | In order to find the maximum bending moment on the arms, it is assumed as a
- simply supported beam carrying a uniformly distributed load over the arm
- fixed at both ends
- cantilever beam fixed at the hub and carrying a concentrated load at the free end of the rim
- none of the mentioned
Q7 | The diameter of the hub of the flywheel is usually taken
- equal to the diameter of the shaft
- twice the diameter of the shaft
- three times the diameter of the shaft
- four times the diameter of the shaft
Q8 | In a four stroke cycle engine camshaft revolves at the crank speed.
- two times
- half
- four times
- three times
Q9 | The gears on camshaft and crankshaft are known as
- lining gears
- aligning gears
- timing gears
- tuning gears
Q10 | The material known as high carbon high copper chrome silicon cast steel is used for making
- camshaft
- cylinder body
- cylinder head
- piston
Q11 | Camshaft gear is made from which material
- cast iron
- mild steel
- bakelite
- brass
Q12 | Crankshafts are usually constructed by
- casting
- drop forging
- drawing
- extrusion
Q13 | The main reasons for crankshaft wear are
- different loads at some points of rotation
- centrifugal forces due to crankshaft rotation
- misalignment in connecting rod
- all of the mentioned
Q14 | The main causes of crankshaft vibration are
- variation in torque
- cyclic variation of gas and combustion products
- unbalanced weight of parts
- all of the mentioned
Q15 | In the cam, the distance between the base circle and the nose is called
- lift
- lobe
- flank
- pitch
Q16 | The crankshaft rotates the camshaft using
- belt drive
- chain drive
- gear drive
- motor drive
Q17 | The crankshaft should be inspected for
- cracks
- alignment of crankpins and journals
- cleanliness of oil gallaries
- all of the mentioned
Q18 | Which of the following are functions of bearings?
- ensure free rotation of shaft with minimum friction
- holding shaft in a correct position
- transmit the force of the shaft to the frame
- all of the listed
Q19 | A radial bearing supports the load that acts along the axis of the shaft.
- true
- false
Q20 | A bearing supports the load acting along the axis of the shaft.
- thrust
- radial
- longitudinal
- transversal
Q21 | Sliding contact bearings, also called plain bearings have no problem of wear.
- true
- false
Q22 | In steam and gas turbines, rolling contact bearings are used.
- true
- false
Q23 | Which of the following are true about plasticity?
- permanent deformation
- ability to retain deformation under load or after removal of load
- plastic deformation is greater than elastic deformation
- all of the mentioned
Q24 | Which of the following is measure of stiffness?
- modulus of elasticity
- modulus of plasticity
- resilience
- toughness
Q25 | Which of the following facts are true for resilience?
- ability of material to absorb energy when deformed elastically
- ability to retain deformation under the application of load or after removal of load
- ability of material to absorb energy when deformed plastically
- none of the mentioned