Description : Needles bearing consist of rollers of small diameter and very small length. a) True b) False
Last Answer : b) False
Description : The needle rollers are a maximum of _______ millimeter in diameter. (a) 4 (b) 5 (c) 6 (d) 7
Last Answer : (b) 5
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 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
Last Answer : (b) False
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 : A cylinder roller creates lesser noise than a deep groove ball bearing. (a) True (b) False
Description : Angular contact bearing can take thrust as well as radial loads. (a) True (b) False
Last Answer : (a) True
Description : Cylindrical roller bearing has a lower load capacity as compared to deep groove ball bearing. (a) True (b) False
Description : Assertion (A): Hydrostatic lubrication is more advantageous when compared to hydrodynamic lubrication during starting and stopping the journal in its bearing. Reason (R): In hydrodynamic lubrication, the fluid film pressure is ... (c) A is true but R is false (d) A is false but R is true
Last Answer : (b) Both A and R are individually true but R is not the correct explanation of A
Description : Assertion (A): In equilibrium position, the journal inside a journal bearing remains floating on the oil film. [IES-1995] Reason (R): In a journal bearing, the load on the bearing is perpendicular to the axis of the ... explanation of A (c) A is true but R is false (d) A is false but R is true
Description : Assertion (A): In steady rotating condition the journal inside a hydrodynamic journal bearing remains floating on the oil film. [IES-2008] Reason (R): The hydrodynamic pressure developed in steady rotating conditions in journal ... A (c) A is true but R is false (d) A is false but R is true
Last Answer : (a) Both A and R are true and R is the correct explanation of A
Description : Hydrodynamic bearing is a self-acting bearing. a) True b) False
Last Answer : a) True
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 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 dynamic load capacity of the bearing. a) True b) False
Description : Cylinder roller creates lesser noise than deep groove ball bearing. a) True b) False
Description : Angular contact bearing can take thrust as well as radial loads. a) True b) False
Description : Cylindrical load bearing has lower load capacity as compared to deep groove ball bearing. a) True b) False
Description : A radial bearing supports the load that acts along the axis of the shaft. a) True b) False
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 : A sliding contact bearing is operating under stable condition. The pressure developed in oil film is p when the journal rotates at N rpm. The dynamic viscosity of lubricant is μ and effective coefficient of ... to p and f) (d) f is directly proportional to μ and inversely proportional to N
Last Answer : (b) f is directly proportional to μ and N
Description : Cono weeder consist of conical rollers have on the periphery. a. Helical projection c. Interrupted projection d. None of above
Last Answer : Ans- b. serrated projection
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
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 : The spring index is the ratio of wire diameter to mean coil diameter. a) True b) False
Description : Nominal diameter of the screw thread is the same as core diameter. a) True b) False
Description : The bearing characteristic number in a hydrodynamic bearing depends on- (a) Length, width and load (b) length, width and speed. [IES-1996] (c) Viscosity, speed and load (d) viscosity, speed and bearing pressure.
Last Answer : (d) viscosity, speed and bearing pressure.
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 : The most suitable bearing for carrying very heavy loads with slow speed is (a) Hydrodynamic bearing (b) ball bearing [IAS 1994] (c) Roller bearing (d) hydrostatic bearing
Last Answer : (d) hydrostatic bearing
Description : Nipping is defined as leaving the gap between full length leaf and graduated length leaf. a) True b) False
Description : Nip is the initial gap between extra full length leaf and the graduated length leaf before the assembly. a) True b) False
Description : Compressed length is smaller than the solid length. a) True b) False
Description : Assertion (A): In anti-friction bearings, the frictional resistance is very low as the shaft held by it remains in floating condition by the hydrodynamic pressure developed by the lubricant. [IES-2006] Reason (R): In hydrodynamic ... of A (c) A is true but R is false (d) A is false but R is true
Last Answer : (d) A is false but R is true
Description : Is use of a flywheel recommended when a large motor is required only for a small instant of time? a) True b) False
Description : . In gear boxes and small size motors, rolling contact bearings are used. a) True b) False
Description : When two concentric springs are made of same material, having same free length and compressed equally by axial load, then the load shared by each spring is proportional to (A) Spring index of each spring ... spring (C) Mean coil diameter of each spring (D) Square of wire diameter of each spring
Last Answer : (D) Square of wire diameter of each spring
Description : If number of coils are 8 and wire diameter of spring 3mm, then solid length is given by? a) None of the listed b) 27mm c) 24mm d) 21mm
Last Answer : c) 24mm
Description : The shock absorbing capacity of bolts can be increased by a) Increasing the shank diameter b) Decreasing the length of shank portion of bolt c) Increase the shank diameter and decreasing the length of shank d) None of the listed
Last Answer : d) None of the listed
Description : If shaft diameter is 40mm, calculate the length of sleeves in clamp coupling. a) 80mm b) 140mm c) 100mm d) 120mm
Last Answer : b) 140mm
Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and height of the key being 14mm and 80mm respectively. Find the compressive stress induced in the key. a) 70.1 N/mm2 b) 51.6N/mm2 c) 45.5N/mm2 d) None of the listed
Last Answer : b) 51.6N/mm2
Description : A muff coupling is connecting two shafts. The torque involved is 650N-m. The shaft diameter is 45mm with length and breadth of the key being 14mm and 80mm respectively. Find the shear stress induced in the key. a) 30.2N/mm2 b) 25.8N/mm2 c) 34.4N/mm2 d) None of the listed
Last Answer : b) 25.8N/mm2
Description : Determine the length of kennedy key required to transmit 1200N-m and allowable shear in the key is 40N/mm2. The diameter of shaft and width of key can be taken as 40mm and 10mm respectively. a) 49mm b) 36mm c) 46mm d) 53mm
Last Answer : d) 53mm
Description : Calculate the shaft diameter on rigidity basis if torsional moment is 196000N-mm, length of shaft is 1000mm. Permissible angle of twist per meter is 0.5’ and take G=79300N/mm2. a) None of the listed b) 41.2mm c) 35.8mm d) 38.8mm
Last Answer : b) 41.2mm
Description : The shafts will have same strength on the basis of torsional rigidity, if (A) Diameter and length of both shafts is same (B) Material of both shafts is same (C) Angle of twist for both shafts is same (D) All of above conditions are satisfied
Last Answer : (D) All of above conditions are satisfied
Description : The standard length for square or flat key in terms of shaft diameter (D) is, (A) d (B) 2d (C) 1.5d (D) 2.5d
Last Answer : (C) 1.5d