1. When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
A.1.57 d
2. Gears are casted by
A.permanent mould casting
3. In a full journal bearing, the angle of contact of the bearing with the journal is
A.360°
4. A cotter joint is used to connect two __________ rods.
A.co-axial
5. The material commonly used for machine tool bodies is
A.cast iron
6. The largest diameter of an external or internal screw thread is known as
A.major diameter
7. The gears are termed as medium velocity gears, if their peripheral velocity is
A.3-15 m/s
8. The product of the diametral pitch and circular pitch is equal to
A.π
9. The smallest diameter of an external or internal screw thread is known as
A.minor diameter
10. The process which improves the machinability of steels, but lowers the hardness and tensile strength is
A.spheroidising
11. A screw is said to be a self locking screw, if its efficiency is
A.less than 50 %
12. An aluminium member is designed on the basis of
A.yield stress
13. The groove angle of the pulley for rope drive is usually
A.45°
14. The ratio of pitch circle diameter in millimetres to the number of teeth, is called
A.module
15. According to Indian standard specifications,
100 H6/g5 means that
A.tolerance grade for the hole is 6 and for the shaft is 5
16. A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called
A.malleability
17. Crowning on pulley helps
A.to keep the belt in centre on a pulley while it is in motion
18. The temperature required for full annealing in hyper-eutectoid steel is
A.50°C above upper critical temperature
19. The material commonly used for crane hooks is
A.wrought iron
20. The eye bolts are used for
A.lifting and transporting heavy machines
21. The dedendum is the radial distance from the
A.pitch circle to the bottom of a tooth
22. In a steam engine, the valve rod is connected to an eccentric rod by means of
A.knuckle joint
23. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
A.axial pitch
24. Which of the following formula is used in designing a connecting rod ?
A.Rankine's formula
25. The shock resistance of steel is increased by adding
A.nickel and chromium
26. A flange coupling is a type of
A. rigid coupling.
27. In cyclic loading, stress concentration is more serious in
A.ductile materials
28. Which of the following property is desirable in parts subjected to shock and impact loads?
A.Toughness
29. A saddle key transmits power through
A. frictional resistance only.
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