Description : A screw is specified by (A) Major diameter (B) Minor diameter (C) Pitch diameter (D) Mean diameter
Last Answer : (A) Major diameter
Description : Nominal diameter of the screw thread is the same as core diameter. a) True b) False
Last Answer : b) False
Description : Most appropriate instrument for measurement of internal and external diameter of a tube is A. vernier callipers B. micrometer screw gauge C. meter rule D. measuring tape
Last Answer : vernier callipers
Description : The designation M 36 × 2 means (A) Metric fine threads of 36 mm outside diameter and 2 mm pitch (B) Metric coarse threads of 36 mm outside diameter and 2 mm pitch (C) Metric threads of 36 mm pitch diameter and 2 mm pitch (D) Metric threads of 36 mm core diameter and 2 mm pitch
Last Answer : (A) Metric fine threads of 36 mm outside diameter and 2 mm pitch
Description : In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft) (A) 2 d (B) 3 d (C) 4 d (D) 5 d
Last Answer : (B) 3 d
Description : A screw jack has 4 threads per inch. The mean radius of the thread is 2.338 inches. The mean diameter of the bearing surface under the cap is 3.25 inches. What is the turning moment required to raise the bload of 150 kg ( a.5.61 kg-inch b.50.6 kg-inch c.107 dynes d.30.3 kg-inch e.23.6 kg-inch
Last Answer : b. 50.6 kg-inch
Description : Under complex or simple loading, strain energy is (a) External work done (b) Internal work done (c) Both internal and external work (d) None
Last Answer : (b) Internal work done
Description : If a fastener is threaded into a tapped hole, then the fastener is likely to be called as a) Screw b) Bolt c) Washer d) Screw or bolt
Last Answer : a) Screw
Description : If the lateral force acting on the set screw is large and tends to displace one part with respect to other than which point is recommended? a) Dog Point b) Cone Point c) Window Point d) Cut Point
Last Answer : a) Dog Point
Description : Maximum possible efficiency of a self-locking screw is a) 50% b) 75% c) 66% d) 33%
Last Answer : a) 50%
Description : Efficiency of the screw _______ with increase of coefficient of friction. a) decreases b) increases c) has no effect d) cannot be determined
Last Answer : a) decreases
Description : Efficiency of the screw depends upon helix angle but does not depend on friction angle. a) True b) False
Description : Efficiency of screw depends upon lead of the screw. a) True b) False
Last Answer : a) True
Description : Threads used in screw fasteners are ______ a. having high strength b. having low efficiency c. single start type d. all of the above
Last Answer : d. all of the above
Description : Which type of screw fasteners are threaded through out its length? a. Cap screws b. Set screws c. Studs d. Tap bolt
Last Answer : b. Set screws
Description : Allen key is used to tighten (A) Cap screw with hexagonal head (B) Cap screw with fillister head (C) Cap screw with hexagonal socket head (D) Cap screw with flat head
Last Answer : (C) Cap screw with hexagonal socket head
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 : Setscrews are (A) Similar to tap bolts except that a greater variety of shapes of heads are available (B) Slotted for screw driver and generally used with a nut (C) Used to prevent relative motion between parts (D) Similar to studs
Last Answer : (C) Used to prevent relative motion between parts
Description : While designing screw threads, adequate length of engaged threads between the screw and nut is provided so as to prevent failure of threads due to (A) Direct shear stress (B) Torsional shear stress (C) Tensile stress (D) Compressive stress
Last Answer : (A) Direct shear stress
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 : The maximum efficiency of a square threaded screw is (A) (1 - sinφ)/ (1 + sinφ) (B) (1 + sinφ)/ (1 - sinφ)s (C) (1 - sinφ)/ (1 + cosφ) (D) (1 + cosφ)/ (1 - sinφ)
Last Answer : (A) (1 - sinφ)/ (1 + sinφ)
Description : In manual assembly, cost of screw is higher than the cost of driving a screw. a) True b) False
Description : Screws are specified by their __________ diameters. (A) Minor (B) Major (C) Pitch (D) None of these
Last Answer : (B) Major
Description : Shank is the portion of bolt between the head and the thread. a) True b) False
Description : If uncompressed length of spring is 40mm and number of coils 10mm, then pitch of coil is? a) 4 b) 40/9 c) 40/11 d) None of the mentioned
Last Answer : b) 40/9
Description : Pitch of coil is defined as axial distance in compressed state of the coil. a) Yes b) It is measured in uncompressed state c) It is same in uncompressed or compressed state d) None of the listed
Last Answer : b) It is measured in uncompressed state
Description : Minor principal stress has minimum ________ a. value of shear stress acting on the plane b. intensity of direct stress c. both a. and b. d. none of the above
Last Answer : b. intensity of direct stress
Description : What is the screw thread contact?
Last Answer : Need answer
Description : Where can I get a ball screw thread?
Last Answer : You can find one online at many different stores. You can try www.precisionscrewthread.com or www.Ball-Screws.Industrial101.com. Ball Screw thread is very advanced and complicated technology. For getting ball screw thread you will need good and advanced CNC machine.
Description : What is the minimum number of round scales in a screw yardage of 100 and pitch 1 mm ?
Last Answer : The number of round scales in a screw yard is 100 and the pitch is 1 mm. Its minimum count is 0.01 mm.
Description : What is the pitch of your laboratory screw gauge?
Last Answer : What is the answer ?
Description : how should I calculate the pitch of the metric thread
Last Answer : There are tables for that. The pitch is determined by the thread diameter.
Description : Mathematically, the ellipse is a curve generated by a point moving in space such that atany position the sum of its distances from two fixed points (foci) is constant and equal to a.the major diameter b.the minor diameter c.semi major diameter d.semi-minor diameter
Last Answer : a.the major diameter
Description : Mathematically, the ellipse is a curve generated by a point moving in space such thatat any position the sum of its distances from two fixed points (foci) is constant and equal to a.the major diameter b.the minor diameter c.semi major diameter d.semi-minor diameter
Description : For elasto-hydrodynamic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (C) There should be elastic deformation of the parts in contact
Description : For hydrostatic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (B) There should be external source like pump to supply lubricant under pressure
Description : For hydrodynamic lubrication (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space (B) There should be external source like pump to ... be elastic deformation of the parts in contact (D) There should be metal to metal contact
Last Answer : (A) There should be relative motion between the surfaces of the journal and the bearing and wedge shaped clearance space
Description : In hydrostatic bearings (A) The Oil film pressure is generated only by the rotation of the journal (B) The oil film is maintained by supplying oil under pressure (C) Do not require external supply of lubricant (D) Grease is used for lubrication
Last Answer : (B) The oil film is maintained by supplying oil under pressure
Description : In compression springs, the external force tends to (A) shorten the spring (B) lengthen the spring (C) both (A) and (C) (D) keep the length same
Last Answer : (A) shorten the spring
Description : For two spring connected in series, the force acting on each spring is same and equal to half of the external force. a) True b) False
Description : Within the external combination engine, a piston rod is usually connected to the cross head by means of....... A. Cotter joints B. Universal joints C. Knuckle joint D. Bearing
Last Answer : A. Cotter joints
Description : The connecting rod bolts are tightened up with the initial tension greater than external load so that (A) Failure of bolt will be static (B) The resultant load on bolt will not be affected by ... ) The bolt will not fail by fatigue although the external load is fluctuating (D) All the three
Last Answer : (D) All the three
Description : The resultant axial force on bolt depends upon (A) Initial tension (B) External applied load (C) Stiffness of bolt and parts held by bolt (D) All three factors
Last Answer : (D) All three factors
Description : The hub diameter of the flywheel is taken as 1. 2.5(shaft diameter) 2. 1.5(shaft diameter) 3. 4(shaft diameter) 4. 2(shaft diameter)
Last Answer : 4. 2(shaft diameter)
Description : The hub diameter of the flywheel is taken as, (A) 2.5 (shaft diameter) (B) 1.5 (shaft diameter) (C) 4 (shaft diameter) (D) 2 (shaft diameter)
Last Answer : (D) 2 (shaft diameter)
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
Last Answer : (a) True
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
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 : 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