Description : Fatigue failure is time dependent failure. a) True b) False
Last Answer : a) True
Description : Slow plastic deformation of metals under a constant stress is termed as __________ failure. (A) Fatigue (B) Endurance (C) Creep (D) None of these
Last Answer : (C) Creep
Description : Which of the following is not a characteristic observed in material failure by fatigue fracture? (A) Plastic deformation of material does not occur (B) Initiation of crack from below the surface does ... (D) Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Last Answer : Option B
Description : Deformation that occurs due to stress over a period of time is known as ____________ a) Wear resistance b) Fatigue c) Creep d) Fracture
Last Answer : c) Creep
Description : The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to (a) static load (b) dynamic load (c) static as well as dynamic load (d) completely reversed load
Last Answer : (d) completely reversed load
Description : Which of the following are true about plasticity? a) Permanent Deformation b) Ability to retain deformation under load or after removal of load c) Plastic deformation is greater than elastic deformation d) All of the mentioned
Last Answer : d) All of the mentioned
Description : A total permanent deformation of 0.0001 of the ball diameter is taken for considering the static load capacity of the sh (a) True (b) False
Last Answer : (a) True
Description : A total permanent deformation of 0.0001 of the ball diameter is taken for considering static load capacity of the shaft. a) True b) False
Description : Which of the following help in accomplishing the locking? a) Creating supplementary friction b) Using special locking devices like split pins c) By plastic deformation d) All of the listed
Last Answer : d) All of the listed
Description : The ability of a material to resist plastic deformation known as _____________ a) Tensile strength b) Yield strength c) Modulus of elasticity d) Impact strength
Last Answer : b) Yield strength
Description : _____ is a surface fatigue failure which occurs when the load on the bearing part exceeds the surface endurance strength of the material. (a) Scoring (b) Pitting (c) Corrosion
Last Answer : (b) Pitting
Description : Propagation of fatigue failure is always due to compressive stresses. a) Due to bending b) Due to tensile c) Due to fatigue d) None of the listed
Last Answer : b) Due to tensile
Description : What will happen if stresses induced due to surge in the spring exceeds the endurance limit stress of the spring. a) Fatigue Failure b) Fracture c) None of the listed d) Nipping
Last Answer : a) Fatigue Failure
Description : The connecting rod bolts are tightened up with the initial tension greater than external load so that (A) Failure of bolt will be static (B) The resultant load on bolt will not be affected by ... ) The bolt will not fail by fatigue although the external load is fluctuating (D) All the three
Last Answer : (D) All the three
Description : Failure of a material is called fatigue when it fails (a) at the elastic limit (b) below the elastic limit (c) at the yield point (d) below the yield point
Last Answer : (d) below the yield point
Description : The phenomenon of decreased resistance of the materials to fluctuating stresses is the main characteristic of _____ failure. a) Fracture b) Fatigue c) Yielding d) None of the mentioned
Last Answer : b) Fatigue
Description : Which of the following facts are true for resilience? a) Ability of material to absorb energy when deformed elastically b) Ability to retain deformation under the application of load or after removal ... c) Ability of material to absorb energy when deformed plastically d) None of the mentioned
Last Answer : a) Ability of material to absorb energy when deformed elastically
Description : The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as (A) Rigid (B) Tough (C) Ductile (D) Plastic
Last Answer : Option C
Description : The material in which large deformation is possible before absolute failure by rupture takes place, is known as (a) Ductile (b) Plastic (c) Brittle (d) Elastic
Last Answer : Ductile
Description : Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False
Last Answer : (b) False
Description : Stribeck equation gives dynamic load capacity of the bearing. a) True b) False
Last Answer : b) False
Description : For elasto-hydrodynamic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (C) There should be elastic deformation of the parts in contact
Description : For hydrostatic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (B) There should be external source like pump to supply lubricant under pressure
Description : For hydrodynamic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space
Description : The permanent mode of deformation of a material known as _____________ a) Elasticity b) Plasticity c) Slip deformation d) Twinning deformation
Last Answer : b) Plasticity
Description : Angular contact bearing can take thrust as well as radial loads. (a) True (b) False
Description : Angular contact bearing can take thrust as well as radial loads. a) True b) False
Description : Scoring is a ________ phenomenon. (a) stick-slip (b) fracture (c) fatigue (d) in-out
Last Answer : (a) stick-slip
Description : Extreme Pressure (EP) additives cause ______ wear in the bearing parts. (a) abrasive (b) corrosive (c) pitting (d) fatigue
Last Answer : (b) corrosive
Description : Scoring is a ________ phenomenon. a) Stick-slip b) Fracture c) Fatigue d) In-out
Last Answer : a) Stick-slip
Description : When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is (a) 0.20 (b) 0.35 (c) 0.50 (d) 0.65
Last Answer : (c) 0.50
Description : Factor of safety for fatigue loading is the ratio of (a) elastic limit to the working stress (b) Young's modulus to the ultimate tensile strength (c) endurance limit to the working stress (d) elastic limit to the yield point
Last Answer : (c) endurance limit to the working stress
Description : The yield point in static loading is ............... as compared to fatigue loading. (a) higher (b) lower (c) same
Last Answer : (a) higher
Description : The resistance to fatigue of a material is measured by (a) elastic limit (b) Young's modulus (c) ultimate tensile strength (d) endurance limit
Last Answer : (d) endurance limit
Description : Does ASME Standard take into consideration shock and fatigue factors? a) Yes b) No
Last Answer : a) Yes
Description : The relationship between the alternating stress and mean stress is given by the following equation: σ a =σ e [1-(σ m /σ u )x], where σ e is the fatigue limit for completely reversed loading. The value of x for Gerber line is equal to _________ a) 1 b) 2 c) 0.5 d) -1
Last Answer : b) 2
Description : Calculate fatigue stress concentration factor, when theoretical stress concentration factor is 1.62 and notch sensitivity is equal to 0.9 a. 1.558 b. 3.358 c. 1.162 d. None of the above
Last Answer : a. 1.558
Description : In S-N diagram, the graph plotted between fatigue strength and number of stress cycles becomes horizontal for which type of materials? a. Ferrous materials b. Non-ferrous materials c. Both a. and b. d. None of the above
Last Answer : a. Ferrous materials
Description : Notch sensitivity (q) is given by the equation _______ where K f = fatigue stress concentration factor and K t = theoretical stress concentration factor a. ( K f + 1 ) / ( K t – 1 ) b. ( K f – 1 ) / ( K t – 1 ) c. ( K f + 1 ) / ( K t + 1 ) d. ( K f - 1 ) / ( K t + 1 )
Last Answer : b. ( K f – 1 ) / ( K t – 1 )
Description : The ability of materials to develop a characteristic behavior under repeated loading known as ___________ a) Toughness b) Resilience c) Hardness d) Fatigue
Last Answer : d) Fatigue
Description : The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as (A) (Kf + 1)/ (Kt + 1) (B) (Kf - 1)/ (Kt - 1) (C) (Kt + 1)/ (Kf + 1) (D) (Kt - 1)/ (Kf - 1)
Last Answer : (B) (Kf - 1)/ (Kt - 1)
Description : The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength. (A) Creep (B) Endurance (C) Fatigue (D) None of these
Last Answer : Option A
Description : Which of the following is (are) true? (A) Cast iron has poor tensile strength compared to steel (B) Failure of cast iron flywheel is sudden and total (C) Machinability of cast iron flywheel is poor compared to steel flywheel (D) All of the above
Last Answer : (D) All of the above
Description : Which of the following is not true for cast iron flywheels? a) Excellent damping b) Cheap c) Given complex shape d) Sudden failure
Last Answer : d) Sudden failure
Description : Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when (A) Strain rate is increased (B) Grain size is increased (C) Prior cold deformation is increased (D) Not affected by any of the above parameters
Last Answer : (A) Strain rate is increased
Description : Do you think scientists will be able to predict an earthquake more precisely and give people several hours advance warning?
Last Answer : I would hope so, but I'm not exactly counting on it. I'm no scientist so I'm not sure how close the scientific community is to a breakthrough in plate techtonics research, but I would think with ... the world, this kind of research might be cut back a little bit in favor of more pressing needs.
Last Answer : Lightning detective sensor
Description : Mark the correct option a) Prior permission is required to join Bharat sevak samaj b) Participation of Govt servants in the Indo-Foreign cultural organizations to be avoided c) Mere intimation ... to join foreign language classes conducted by Indo- foreign cultural organizations. e) All the above
Last Answer : e) All the above