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 : Flexible shafts have ______ rigidity in bending moment. a) High b) Low c) Very high d) Extremely low
Last Answer : b) Low
Description : Which of the following is incorrect? a. In torsion equation, we use mean torque b. In torsion equation, we use maximum torque c. Many shafts are designed under combined bending and torsion load d. Shafts are also designed for torsional rigidity
Last Answer : a. In torsion equation, we use mean torque
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 : 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 : Spiral spring is quite rigid. a) Yes b) No it is flexible c) It is of moderate rigidity d) Rigidity can’t be determined
Last Answer : b) No it is flexible
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 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 : If fluid film pressure is high and surface rigidity is low than mode of lubrication is called as elastohydrodynamic lubrication. a) True b) False
Last Answer : a) True
Description : Which of the following isn’t the property of taper roller? a) High rigidity b) Easy dismantling c) Take low radial and heavy loads d) All are the properties of tapper roller
Last Answer : c) Take low radial and heavy loads
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 : 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 : The deep groove ball bearing has immense rigidity. (a) True (b) No, it has point contact and hence low rigidity (c) It has surface contact (d) It has line contact
Last Answer : (b) No, it has point contact and hence low rigidity
Description : Deep groove ball bearing has immense rigidity. a) True b) No it has point contact and hence low rigidity c) It has surface contact d) It has line contact
Last Answer : b) No it has point contact and hence low rigidity
Description : Helical torsion spring is used in (A) door hinges (B) door closers (C) automobile starters (D) all of the above
Last Answer : (D) all of the above
Description : The type of spring used to absorb and release energy in mechanical watches is (A) Helical extension spring (B) Multi-leaf spring (C) Spiral spring (D) Helical torsion spring
Last Answer : (C) Spiral spring
Description : The type of spring used in vehicle clutches is, (A) Helical compression spring (B) Belleville spring (C) Both (A) and (B) (D) Helical torsion spring
Last Answer : (C) Both (A) and (B)
Description : When the helical torsion spring is subjected to torque, the type of stress induced in the spring wire is, (A) Tensile stress (B) Compressive stress (C) Bending stress (D) Torsional shear stress
Last Answer : (C) Bending stress
Description : The type of spring used in door hinges is, (A) Helical extension spring (B) Multi-leaf spring (C) Spiral spring (D) Helical torsion spring
Last Answer : (D) Helical torsion spring
Description : The type of spring used to achieve any linear or non-linear load-deflection characteristic is (A) Spiral spring (B) Non-ferrous spring (C) Belleville (coned disk) spring (D) Torsion spring
Last Answer : (C) Belleville (coned disk) spring
Description : For a helical torsion sprig, the stress concentration factor at outer fibre is? Give spring index=5. a) 0.78 b) 0.87 c) 1.87 d) 0.69
Last Answer : b) 0.87
Description : For a helical torsion sprig, the stress concentration factor at inner fibre is? Give spring index=5. a) 1.005 b) 1.175 c) 1.223 d) 1.545
Last Answer : b) 1.175
Description : The helical spring ad wire of helical torsion spring, both are subjected to torsional shear stresses. a) True b) False
Last Answer : b) False
Description : Transverse fillet welds are under (i) Bending and shear stresses (ii)Compressive and torsion shear stresses (iii)Tensile and compressive stresses (iv)None
Last Answer : (iv)None
Description : Parallel fillet welds are under Shear and bending stresses Compressive and torsion shear stresses Tensile and compressive stresses None
Last Answer : None
Description : The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is (A) 1/4 (B) 1/2 (C) 1/16 (D) 15/15
Last Answer : (D) 15/15
Description : The ratio of strengths of solid to hollow shafts, both having outside diameter D and hollow having inside diameter D/2, in torsion, is a.1/4 b. 1/2 c. 1/16 d. 15/16
Last Answer : d. 15/16
Description : Two shafts in torsion will have equal strength if a. Only diameter of the shafts is same b. Only angle of twist of the shaft is same c. Only material of the shaft is same d. Only torque transmitting capacity of the shaft is same
Last Answer : d. Only torque transmitting capacity of the shaft is same
Description : A circular shaft subjected to torsion undergoes a twist of 10in a length of 120 cm. If the maximum shear stress induced is limited to 1000 kg/cm2and if modulus of rigidity G = 0.8 x 106then the radius of the shaft should be (a) p/8 (b) p/27 (c) 18/p (d) 27/p
Last Answer : (d) 27/p
Description : Keyed joints never lead to stress concentration on shafts. a) True b) False
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 : 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 : A knuckle joint is unsuitable for two rotating shafts, which transmit torque a) True b) False
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 : Oldham coupling i used to connect two shafts having intersecting axes. a) True b) False
Description : A coupling is a mechanical device that temporarily joins two rotating shafts to each other. a) True b) False
Description : Solid shafts are used in epicyclic gearboxes. a) True b) False
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 : 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 : 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 : 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