A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.For each of the following multiple choice questions, choose the most appropriate answer :
1. Which one of the following range of carbon content is present in pig iron?
A. 0.05 to 1.4%
B. 0.9 to 1.4%
C. 1.7 to 2.2%
D. 3to5%
2. It is required to finish grind a dia 50mm hardened steel shaft on a cylindrical grinding machine, if the recommended surface speed of the work is 33 metres/minute, the rpm of the work is?
A. 190
B. 150
C. 210
D. 250
3. Why do you hold a workpiece lengthwise while machining in a planning machine?
A. It is easier to load workpiece lengthwise
B. The idle time will be minimised
C. The surface quality will be improved
D. The tool life will be increased
4. It is the process of removing very small chips from metal surfaces by means of a sharp-edged tool. What is this tool called as ?
A. Scraper
B. Chisel
C. Hacksaw
D. Reamer
5. Which one of the following materials is used for making a grinding wheel ?
A. Silicon carbide
B. Granite
C. Sand
D. Calcium carbonate
6. The angle of I.S. thread (V-shaped) is
A. 29°
B. 471/2°
C. 50°
D. 60°
7. Arc utilized in electric arc welding is a
A. High voltage, high current discharge
B. Low voltage, low current discharge
C. Low voltage, high current discharge
D. High voltage, low current discharge
8. Which one of the following instruments is used to measure accurately the angle of taper?
A. Bevel gauge
B. Bevel protractor
C. Vernier bevel protractor
D. Taper gauge
9. Which one of the following metals has better electrical conductivity than copper?
A. Lead
B. Tin
C. Zinc
D. Silver
10. Carbon steel piece is heated just above 730°C, maintained at that temperature for a few hours and then slowly coole
A. What heat treatment process is carried out ?
B. Normalizing
C. Casehardening
D. Hardening
11. Zero error in micrometer means
A. there is negligible gap between the spindle and the anvil
B. micrometer is true
C. zero mark on the thimble is not visible
D. zero on thimble and datum line on sleeve do not coincide when measuring faces are in contact
12. Point angle of center punch is
A. 30°
B. 60°
C. 90°
D. 120°
13. Back-gear mechanism is provided in cone pulley headstock to
A. Reduce the speed of spindle
B. Increase the speed of spindle
C. Reverse the speed of spindle
D. Transmit power from spindle gear to stud gear
14. Grinding wheel is marked : 51 A 46 L 5 V - 23. Here what does 5 denote ?
A. Kind of bond
B. Structure
C. Kind of abrasive
D. Grain size
15. Which type of fire extinguisher is used in a welding shop?
A. Foam type extinguisher
B. Dry powder extinguisher
C. CO2 extinguisher
D. Halon extinguisher
16. Minimum distance from a rivet hole centre to the nearest edge of a plate is called :
A. Lead
B. Pitch
C. Magin
D. Lag
17. Unusual sound is heard during rough boring a large diameter hole. Which one of the following statements is the cause for this defect ?
A. Boring tool springs its travel
B. Coolant is not applied with force
C. Tool set below centre
D. No secondary clearance ground on the front cutting edge
18. Divider is used for
A. scribing circles
B. scribing arcs
C. transferring and stepping of distance
D. All these
19. Which machine is used to cut small pieces of sheet metal?
A. Bending
B. Welding
C. Notching
D. Drilling
20. Which one among the following properties of a metal is the power of return to its original shape after deformation when the load is removed?
A. Ductility
B. Malleability
C. Stiffness
D. Elasticity
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