Description : Coarse threads have helix angle _____ fine threads. a) Equal to b) Greater than c) Lesser than d) There is no relation
Last Answer : c) Lesser than
Description : The shock absorbing capacity of bolt can be increased by making the shank diameter ________ the root diameter. a) Lesser than b) Equal to c) Greater than d) No effect
Last Answer : b) Equal to
Description : Self-locking takes place when a) Coefficient of friction is equal to or greater than the tangent of the helix angle b) Coefficient of friction is lesser than or equal to the tangent of the helix ... friction is equal to or greater than the tangent of the helix angle d) None of the mentioned
Last Answer : c) Coefficient of friction is equal to or greater than the tangent of the helix angle
Description : A cylinder roller creates lesser noise than a deep groove ball bearing. (a) True (b) False
Last Answer : (b) False
Description : Cylinder roller creates lesser noise than deep groove ball bearing. a) True b) False
Last Answer : b) False
Description : Consider the following pairs of types of bearings and applications: 1. Partial Journal bearing................... Rail wagon axles 2. Full journal bearing ......................Diesel engine crank-shaft 3. Radial bearing ... matched? [IES-2000] (a) 1 alone (b) 1 and 2 (c) 2 and 3 (d) 1, 2 and 3
Last Answer : (b) 1 and 2
Description : In case of partial bearing, the angle of contact of the bushing with the journal is (A) 270° (B) More than 180° (C) Less than 180° (D) 360°
Last Answer : (C) Less than 180°
Description : A thick film bearing is a bearing (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant (B) Where the surfaces of journal and the bearing are partially ... are separated by a film created by elastic deflection of parts (D) Where there is no lubricant
Last Answer : (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant
Description : A thin film bearing is a bearing (A) Where the surfaces of journal and the bearing are completely separated by a film of lubricant (B) Where the surfaces of journal and the bearing are partially ... are separated by a film created by elastic deflection of parts (D) Where there is no lubricant
Last Answer : (B) Where the surfaces of journal and the bearing are partially separated by a film of lubricant and there is partial metal to metal contact
Description : In case of partial bearing, the angle of contact of the bushing with the journal is usually (A) 120° (B) 180° (C) 45° (D) 360°
Last Answer : (A) 120°
Description : A zero film bearing is a bearing (A) Where the surfaces of journal and the bearing are separated by a thick film of lubricant (B) Where the surfaces of journal and the bearing are partially ... bearing are separated by a film created by elastic deflection of parts (D) Where there is no lubricant
Last Answer : (D) Where there is no lubricant
Description : Fitted bearing must be partial bearing. a) True b) No c) No lubricating space is required d) Can’t be stated
Last Answer : a) True
Description : Partial bearing is preferred over journal bearing. a) True b) No c) More friction losses d) Can’t be determined
Description : A clearance bearing is design accurately to keep the radius of journal and bearing equal. a) Journal radius is kept larger b) Journal radius is kept smaller c) True d) Can’t be determined
Last Answer : b) Journal radius is kept smaller
Description : Which of the following statements are true about eccentrically loaded circular base? a) All bolts are symmetrically spaced with equal angle on either side of vertical b) Bolts are not preloaded c) Bearing is rigid d) Dowel pins are used to relieve stresses
Last Answer : a) All bolts are symmetrically spaced with equal angle on either side of vertical
Description : Which one of the following sets of parameters should be monitored for determining safe operation of journal bearing? [IES-2000] Oil pressure, bearing metal temperature and bearing vibration (b) ... shaft (c) Bearing metal temperature and oil pressure (d) Oil pressure and bearing vibration
Last Answer : Oil pressure, bearing metal temperature and bearing vibration
Description : A full journal bearing having clearance to radius ratio of 1/100, using a lubricant with μ=28×10-3 Pa s supports the shaft journal running at N = 2400 rpm If bearing pressure is 1.4 MPa, the Somerfield number is [IES-2001] (a) 8×10-3 (b) 8×10-5 (c) 0.48 (d) 0.48×10
Last Answer : (a) S = (μN s /p) (r/c) 2
Description : In case of full journal bearing, the angle of contact of the bushing with the journal is (A) 60° (B) 90° (C) 180° (D) 360°
Last Answer : (D) 360°
Description : Flywheel absorbs energy during those periods of crank rotation when 1. The twisting moment is greater than the resisting moment 2. The twisting moment is equal to the resisting moment 3. The twisting moment is less than resisting moment 4. The load on engine falls
Last Answer : 1. The twisting moment is greater than the resisting moment
Description : The length to diameter ratio for a square bearing is (A) More than 1 (B) Less than 1 (C) 8 (D) 1
Last Answer : (D) 1
Description : The length to diameter ratio for a short bearing is (A) More than 1 (B) Less than 1 (C) 8
Last Answer : (B) Less than 1
Description : The strength of a welded joint with respect to a riveted joint is a. Greater b. Smaller c. Equal d. None
Last Answer : a. Greater
Description : Efficiency of a welded joint with respect to a riveted joint is a. Smaller b. Equal c. Greater
Last Answer : c. Greater
Description : Which threads have greater resistance to unscrewing? a) Coarse b) Fine c) They have equal resistance d) Cannot be determined
Last Answer : b) Fine
Description : _______is suitable as a lubricant for heavy-duty applications of rolling contact bearing. (a) Grease (b) Lubricating oil (c) Graphite (d) Air
Last Answer : (b) Lubricating oil
Description : ________is suitable as a lubricant for low and moderate loads applications of rolling contact bearing. (a) Grease (b) Lubricating oil (c) Graphite (d) Air
Last Answer : (a) Grease
Description : The purpose of lubrication in an antifriction bearing is (a) to reduce the friction between balls and races (b) dissipation of frictional heat prevention of corrosion (c) protection of the bearing from dirt and other foreign particles (d) all of the mentioned
Last Answer : (d) all of the mentioned
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 : Extreme Pressure (EP) additives cause ______ wear in the bearing parts. (a) abrasive (b) corrosive (c) pitting (d) fatigue
Last Answer : (b) corrosive
Description : The ball bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 hr and the shaft is rot (a) 42.21 kN (b) 37.29 kN (c) 26.33 kN (d) 35.22 kN
Last Answer : (b) 37.29 kN
Description : Calculate the bearing life if expected life for 90% bearings is 9000 hr and the shaft is rotating at 1500 rpm. (a) 850 million rev (b) 810 million rev (c) 810 hr (d) 850 hr
Last Answer : (b) 810 million rev
Description : The dynamic load-carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life of 1000 revolutions. (a) True (b) False
Description : The rated life of a bearing varies (a) directly as load (b) inversely as the square of the load (c) inversely as the cube of the load
Last Answer : (c) inversely as the cube of the load
Description : The life of an individual ball bearing is the time period for which it works without any signs of failures. (a) True (b) False
Description : Stribeck equation gives the dynamic load capacity of the bearing. (a) True (b) False
Description : The static load is defined as the load acting on the bearing when the shaft is _____. (a) stationary (b) rotating at rpm
Last Answer : (a) stationary
Description : An antifriction bearing consists of (a) rolling elements (b) races (c) cages (d) all of the listed
Last Answer : (d) all of the listed
Description : Which one of the following parts of a ball bearing acts as a barrier between the balls preventing them from bumping into each other? (a) Inner race (b) Outer race (c) Rolling element (d) Cage
Last Answer : (d) Cage
Description : Which one of the following parts of a ball bearing is mounted to the housing and is stationary? (a) Inner race (b) Outer race (c) Rolling element (d) Cage
Last Answer : (b) Outer race
Description : Which one of the following parts of a ball bearing is mounted on the rotating shafts and tends to rotate the shaft? (a) Inner race (b) Outer race (c) Rolling element (d) Cage
Last Answer : (a) Inner race
Description : A rolling contact bearing is specified as X307. Calculate the bearing diameter. (a) 35 mm (b) 28 mm (c) 21 mm (d) 7 mm
Last Answer : (a) 35 mm
Description : Needles bearing consist of rollers of small diameter and very small length. (a) True (b) False
Description : What type of bearing will you recommend for use in the conveyor belt roller? (a) Ball-bearing (b) Roller bearing (c) Magnetic bearing (d) None of the mentioned
Last Answer : (b) Roller bearing
Description : Which of the following cannot tolerate misalignment? (a) Angular contact bearing (b) Cylinder roller bearing (c) Thrust ball bearings (d) All of the listed
Last Answer : (d) All of the listed
Description : Which one of the following bearing is intended for a very heavy radial load? (a) Ball bearing (b) Self-aligning roller bearing (c) Roller bearing (d) Thrust bearing
Last Answer : (b) Self-aligning roller bearing
Description : Which of the following cannot take the radial load? (a) Cylindrical Roller bearing (b) Taper roller bearing (c) Thrust ball bearing (d) Spherical roller bearing
Last Answer : (c) Thrust ball bearing
Description : Which of the following isn’t the property of a taper roller bearing? (a) High rigidity (b) Easy dismantling (c) Take low radial and heavy loads (d) It is unsuitable for high speed applications
Last Answer : (c) Take low radial and heavy loads
Description : The angular play bearing must be mounted without axial play. (a) Yes (b) Little tolerance is adjusted
Last Answer : (a) Yes
Description : Which of the bearings given below SHOULD NOT be subjected to a thrust load? (a) Deep groove ball bearing (b) Angular contact ball bearing (c) Cylindrical (straight) roller bearing (d) Single row tapered roller bearing
Last Answer : (c) Cylindrical (straight) roller bearing