1. Which of the following joint is used for pipes carrying water under low pressures? Socket joint Expansion joint Increasing the diameter of threaded portion Adhesive joint 2. The critical speed of a shaft can be increased by Increasing the diameter of threaded portion shaft diameter may be increased frictionless bearings be used bearings may be brought closer together 3. In a tap set, the first tap used in thread cutting is Bottom tap Straight tap Any one Taper tap 4. A solderberg line for ductile material gives upper limit for alternating tensile stress alternating compressive stress Increasing the diameter of threaded portion any combination of mean and alternating stresses 5. When both pinion and gear are made of the same material, then from the design point of view Criteria is strength of any one of the teeth Any one of the two may be taken as determining factor Pinion is the determining factor Gear is the determining factor 6. Which of the following formula for columns takes into account any initial crookedness of the column and imperfectness of axial loading? Increasing the diameter of threaded portion Secant formula Rankiness formula Eulers formula 7. A chain drive is used for Distance is no criteria for such drives Very short distance Long distance Medium distance 8. In case of steels, as the percentage of carbon content increases Hardness decreases Elongation increases Tensile strength increases Chrome steel 9. The buckling load depends on Cross-sectional area Modulus of elasticity Slendemess ratio All of the options 10. Which dynamometer will be most suitable for measuring the BHP of an automobile engine? Electrical resistance type Electrical generator type Hydraulic type none of the options 11. If screw threads are to be used in a situation involving high stresses in one direction only, the types of threads suitable for this would be BA Acme BSW Buttress 12. The pressure angle an involute gear profile gear Depends on speed of operation Remains constant Depends on gear pitch and clearance Changes with position 13. The property which refers to the relative ease with which a material can be cut is known as Machinability Chrome steel Stiffness Malleability 14. An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen The motor will get burnt The motor will run with peculiar noise The motor will not start The operating speed of the motor will be less than the rated 15. Fatigue is mostly initiated at Increasing the diameter of threaded portion centre core surface 16. The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be 33% 47% 41% 25% 17. While designing a shaft pulley and key for a system Shaft is the weakest member Key is the weakest member All are designed for equal strength Pulley is the weakest member 18. Fatigue failure starts at some discontinuity star hole Increasing the diameter of threaded portion 19. For minimum noise use which type of gears are used Hypoid gears Helical gears Cast steel Bevel gears 20. In elevated circular steel tanks, hemispherical bottoms are preferred because better appearance large capacity riveted connection between the side and bottom plates are easy All of the options 21. The bearing used in railway wagons are Ball bearings Roller bearings Bush bearings Journal bearings 22. In which component a ball or roller bearing cannot be used? Wheel bearing in automobiles Small end of connecting rod Water circulating pump Big end of connecting rod 23. For design purpose a spur gear tooth is considered As vital component in analysis As a cantilever Proped beam As a rough surfacerubbing with another rough surface 24. Gears for wrist watches are generally manufactured by Pitcl, angle Helix angle Axial pitch angle Lead angle 25. Muntz metal contains Copper-aluminium Copper-tin Copper-zinc Copper-chromium 26. Stretching on a belt can be controlled by decreasing belt velocity decreasing belt length decreasing stress in the belt none of the options 27. A 20 HP 1500 r.p.m. induction motor will take current of nearly 1 Amp 5 Amp 10-15 Amp 20-30 Amp 28. In cross or regular lay ropes The direction of twist in wires in strands is opposite to the direction of twist of strands The direction of twist in wires in strands is the same as the direction of twist of strands Wires in two adjacent strands are twisted in opposite direction Wires are never twisted 29. The deep bins are the containers in which the plane of rupture intersects the opposite surface (wall) near the bottom Increasing the diameter of threaded portion the top surface of material stored the opposite face (wall) near the top 30. The included angle of American National threads is 55? 50? 60? 29? 31. A coupling used to connect two perfectly aligned shafts is Oldham coupling rigid tlange coupling bush pin coupling none of the options 32. In case of sunk key The key way is cut in both shaft and hub The key way is helical along the shaft The key way is cut in bub only The key way is cut in shaft only 33. Full stress reversal normally does not occur in bolted connections due to pre-loading during tightening surface hardness ridges and valleys in the form of threads varying cross-section 34. Which of the following statement is false? The sleeve of a muff coupling is designed as a solid shaft Ball and roller bearings are anti-friction bearings Buttress threads are used to transmit power in one direction only In designing gear, the tooth is considered as a cantilever subjected to an end load 35. Which process will improve the fatigue life of a part? Electrocoating Chemical coating Polishing Shot peening 36. Miter gears are Helical gears with same number of teeth Spur gears with same number of teeth Right angled bevel gears with same number of teeth Gears with different profiles 37. In case of ductile materials the theory of elastic failure generally applied is Maximum principal stress theory Distortion energy theory Maximum strain theory Maximum shear stress theory 38. In door shutters, the type of the spring used is close coiled helical spring helical torsion spring spiral spring Cast steel 39. Addendum is Height by which tooth projects beyond the pitch circle The depth of a gear tooth Depth of tooth space below the pitch circle Half the depth of a gear tooth 40. In the case of roller bearings the contacting areas between rollers and running tracks are parabolic oblong elliptical Cast steel 41. The frictional horse power loss in a bearing having 25 mm diameter subjected to a load of 200 kg rotating at 600 rpm will be of the order of 1 HP 0.5 HP 0.05 HP 2HP 42. A foundation bolt with a circular end is secured to the floor by means of a steel cotter. If the pull on the bolt is 14000 kg, the diameter of the bolt should be Double shear 50 mm 30 mm 10 mm 43. Operation of helical gears is silent and quiet while the operation of the spur gears is noisy because helical gears have some helix angle but the spur gears are straight there is end thrust in helical gears in helical gears, contact begins at one end of the entering tooth and gradually extends along a diagonal line across the tooth face as the gears rotate none of the options 44. The average values of modulus of rigidity for aluminium brass, copper and steel in descending order is Aluminium, copper, brass, nickel and steel Aluminium, brass, copper, nickel and steel Aluminium, nickel, brass, copper and steel Aluminium, copper, nickel, brass and steel 45. Iniversal coupling is Type of flange coupling Rigid coupling Used for collinear shafts Used for non-collinear shafts 46. Screw parts with a right hand thread must only be stressed In the direction of screwing in In the direction normal to the screw axis In the direction of screwing out In the shear plane 47. Which of the following equipment operates at higher speeds as compared to the remaining? Diesel engines Automobiles Steam turbines Machine tools 48. Which of the following drive cannot be used for driving cam shaft of a four stroke intemal cambustion engine? V-belt drive Helical gear drive Chain drive Spur gear drive 49. Ball bearing type screws are generally used In bench vices Steering mechanisms In screw jacks In earthmoving machinery 50. 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