Description : A coupling is a mechanical device that temporarily joins two rotating shafts to each other. a) True b) False
Last Answer : b) False
Description : A bushed-pin type flange coupling is used (A) For intersecting shafts (B) When the shafts are not in exact alignment (C) For small shafts rotating at slow speeds (D) For parallel shafts
Last Answer : (B) When the shafts are not in exact alignment
Description : Oldham coupling i used to connect two shafts having intersecting axes. a) True b) False
Description : A knuckle joint is unsuitable for two rotating shafts, which transmit torque a) True b) False
Last Answer : a) True
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 : A flange coupling is used to connect two shafts A. Which are perfectly aligned B. Which are not in exact alignment C. Have lateral misalignment D. Whose axes intersect at a small angle
Last Answer : A. Which are perfectly aligned
Description : Oldham coupling is used to connect two shafts A. Which are perfectly aligned B. Which are not in exact alignment C. Which have lateral misalignment D. Whose axes intersect at a small angle
Last Answer : C. Which have lateral misalignment
Description : A universal coupling is used to connect two shafts A. Which are not in exact alignment B. Which are perfectly aligned C. Whose axes intersect at a small angle D. Have lateral misalignment
Last Answer : C. Whose axes intersect at a small angle
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 : Keyed joints never lead to stress concentration on shafts. a) True b) False
Description : Solid shafts are used in epicyclic gearboxes. a) True b) False
Description : Clutch and coupling can be considered to be same. a) True b) False
Description : Power is transmitted by only in rigid flange coupling. a) True b) False
Description : Entire torque is transmitted by friction in the clamp coupling. a) True b) False
Description : Clamp coupling employ bolts. a) True b) False
Description : A machine started malfunctioning due to some issues with the coupling. The coupling emplaced in the machine was Oldham. The only coupling available in the workshop is Hooke’s coupling. So Oldham coupling can be replaced by Hooke’s coupling. a) True b) False
Description : Flange coupling is rigid types coupling. A. True B. False
Last Answer : A. True
Description : Universal coupling is rigid types coupling. A. True B. False
Last Answer : B. False
Description : Assertion (A): In hydrodynamic journal bearings, the rotating journal is held in floating condition by the hydrodynamic pressure developed in the lubricant. Reason (R): Lubricant flows in a converging-diverging channel. [IES-1994] ... 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 individually true and R is the correct explanation of A
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 : Cotter joints is used for transforming rotating torque. A. True B. False
Description : Shaft is rotating machine element. A. True B. False
Description : Calculate the force acting on the each pin in flexible coupling if torque transmitted is 397N-m and PCD=120mm with number of pins 6. a) 1400.3N b) 1102.8N c) 1320.3N d) None of the listed
Last Answer : b) 1102.8N
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the diameter of each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. Permissible tensile stress is 80N/mm2. a) 27mm b) 25mm c) 23mm d) 21mm
Last Answer : a) 27mm
Description : If 8 bolts are emplaced in a clamp coupling with shaft diameter 80mm d, calculate the tensile force on each bolt if coefficient of friction is 0.3 and torque transmitted is 4000N-m. a) 51234.4N b) 45968.3N c) 41666.7N d) None of the listed
Last Answer : c) 41666.7N
Description : Two shafts A and B are made of same material. The diameter of shaft A is twice that of B. The torque transmitted by shaft A will be (A) Twice that of B (B) Four times that of B (C) Eight times that of B (D) Sixteen times that of B
Last Answer : (C) Eight times that of B
Description : Two shafts A and B are made of same material. The diameters of shaft A and B are dA and dB respectively. The ratio of torque transmitted by shaft A to that of shaft B will be (A) dA/dB- (B) (dA/dB-)2 (C) (dA/dB-)3 (D) (dA/dB-)4
Last Answer : (C) (dA/dB-)3
Description : Deep groove ball bearings are used for (a) heavy thrust load only (b) the small angular displacement of shafts (c) radial load at high speed (d) combined thrust and radial loads at high speed
Last Answer : (d) combined thrust and radial loads at high speed
Description : Which one of the following types of bearings is employed in shafts of gearboxes of automobiles? [IES-1999] (a) Hydrodynamic journal bearings (b) Multi-lobed journal bearings (c) Antifriction bearings (d) Hybrid journal bearings
Last Answer : (c) Antifriction bearings
Description : Flexible shafts have ______ rigidity in bending moment. a) High b) Low c) Very high d) Extremely low
Last Answer : b) Low
Description : Flexible shafts have _______ rigidity in torsion making them flexible. a) Low b) High c) Very high d) Infinitely small
Last Answer : b) High
Description : Which of the following act on shafts? a) Torsional moment b) Bending Moment c) Both torsional and bending d) None of the mentioned
Last Answer : c) Both torsional and bending
Description : Shafts are subjected to ______ forces. a) Compressive b) Tensile c) Shear d) None of the listed
Last Answer : b) Tensile
Description : Maximum shear stress theory is used for (A) Cast iron shafts (B) Steel shafts (C) Flexible shafts (D) Plastic shafts
Last Answer : (B) Steel shafts
Description : Maximum principle stress theory is used for (A) Cast iron shafts (B) Steel shafts (C) Aluminum shafts (D) Plastic shafts
Last Answer : (A) Cast iron shafts
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