Description : Hollow saddle key is superior to flat saddle key as far as power transmitting capability is concerned. a) True b) False
Last Answer : b) False
Description : Saddle key is more suitable than sunk key for heavy duty applications. 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 : Entire torque is transmitted by friction in the clamp coupling. a) True b) False
Description : The key, which fits in the keyway of hub, only is called, (A) Saddle key (B) Feather key (C) Woodruff key (D) Kennedy key
Last Answer : (A) Saddle key
Description : Which of the following are not true for petroff’s equation? a) Shaft is considered concentric with the bearing b) Bearing is subjected to light load c) Is used to find coefficient of friction d) Frictional torque is given by fpr2l
Last Answer : d) Frictional torque is given by fpr2l
Description : Which of the following are functions of bearings? a) Ensure free rotation of shaft with minimum friction b) Holding shaft in a correct position c) Transmit the force of the shaft to the frame d) All of the listed
Last Answer : d) All of the listed
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 : 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 : Cotter joint is going to be use to connect the two rods for torque transmission purpose. a) True b) False
Description : Cotter joints is used for transforming rotating torque. A. True B. False
Last Answer : B. False
Description : Cotter joint can be used to connect two rods for torque transmission purpose. true /false. a) True b) False
Description : Cotter joint can be used to connect two rods for torque transmission purpose. a) True b) False
Description : Axle is frequently used in torque transmission. a) True b) False
Description : Assertion (A): Oil as a cutting fluid result in a lower coefficient of friction. Reason (R): Oil forms a thin liquid film between the tool face and chip, and it provides 'hydrodynamic lubrication'. [IES- 2000] (a ... explanation of A (c) A is true but R is false (d) A is false but R is true
Last Answer : (c) A is true but R is 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 : Efficiency of the screw depends upon helix angle but does not depend on friction angle. 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 : The distribution of the forces along the length of key fitted in a shaft (A) Varies linearly (B) Is uniform throughout (C) Varies exponentially, being more near the torque-input end (D) Varies exponentially, being less near the torque-input end
Last Answer : (C) Varies exponentially, being more near the torque-input end
Description : Feather key can be used to prevent axial motion between two elements. a) True b) False
Description : In sunk key no slips occurs A. True B. False
Last Answer : A. True
Description : The ends of spring, which are in contact with the seat, are (A) Active coils (B) Inactive coils (C) Transmit maximum force (D) Do not transmit any force
Last Answer : (B) Inactive coils
Description : Splines are used if, (A) The power to be transmitted is high (B) The torque to be transmitted is high (C) The speed is high (D) There is relative motion between shaft and hub
Last Answer : (D) There is relative motion between shaft and hub
Description : Power is transmitted by only in rigid flange coupling. a) True b) False
Description : Jam nut is a locking device in which (A) A smaller nut is tightened against main nut creating friction at the contacting surface (B) A split pin is passed through diametrically opposite slots in nut and ... parts of nut separated by slot (D) An elastic piece is tightened in the nut by a setscrew
Last Answer : (A) A smaller nut is tightened against main nut creating friction at the contacting surface
Description : Castle nut is a locking device in which (A) A smaller nut is tightened against main nut creating friction at the contacting surface (B) A split pin is passed through diametrically opposite slots in nut and ... of nut separated by slot (D) An elastic piece is tightened in the nut by a setscrew
Last Answer : (B) A split pin is passed through diametrically opposite slots in nut and a hole in bolt and the two ends of split pin are separated and bent back on nut
Description : Partial bearing is preferred over journal bearing. a) True b) No c) More friction losses d) Can’t be determined
Description : In case of clamp coupling, power is transmitted by means of, (A) Friction force (B) Shear resistance (C) Crushing resistance (D) None of the above
Last Answer : (A) Friction force
Description : Consider tile following statements: [IES-1993; 2002; 2006] Radius of friction circle for a journal bearing depends upon 1. Coefficient of friction 2. Radius of the journal 3. Angular speed of rotation of the shaft Which of the ... ) 1,2 and 3 (b) Only 1 and 2 (c) Only 2 and 3 (d) Only 1 and 3
Last Answer : (b) Only 1 and 2
Description : Increase in values of which of the following results in an increase of the coefficient of friction in a hydrodynamic bearing? [IES 2007] 1. Viscosity of the oil. 2. Clearance between shaft and bearing. 3. Shaft speed. Select the ... 1 and 2 only (b) 1 and 3 only (c) 2 and 3 only (d) 1, 2 and 3
Last Answer : (b) 1 and 3 only
Description : When the driving torque is more than load torque, flywheel is ______ 1. Accelerated 2. Decelerated 3. Constant velocity 4. Can’t be determined
Last Answer : 1. Accelerated
Description : The flywheel is accelerate when 1. driving torque > load torque 2. driving torque < load torque 3. driving torque = load torque 4. driving torque / load torque
Last Answer : 1. driving torque > load torque
Description : The flywheel is accelerated when (A) Driving torque > Load torque (B) Driving torque < Load torque (C) Driving torque = Load torque (D) Any of the above
Last Answer : (A) Driving torque > Load torque
Description : For two stroke engine, work done/cycle is (where T m is the mean torque) (A) πT m (B) 2πT m (C) 3πT m (D) 4πT m
Last Answer : (B) 2πT m
Description : For four stroke engine, work done/cycle is (where T m is the mean torque) (A) πT m (B) 2πT m (C) 3πT m (D) 4πT m
Last Answer : (D) 4πT m
Description : When the torque required by the machine is more than the torque supplied by the motor, the flywheel is (A) Accelerated (B) Retarded (C) Rotating with constant speed (D) Any of the above
Last Answer : (B) Retarded
Description : When the driving torque is more than load torque, flywheel is ______ a) Accelerated b) Decelerated c) Constant velocity d) Can’t be determined
Last Answer : a) Accelerated
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 : 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