Machinist (Grinder)semester 1 - 2017-19 part I Exam question paper

Machinist (Grinder)semester 1 - 2017-19 part I Exam question paper

Machinist grinder 

1.Units used for cutting speed in grinding is -
a) fi/min b) m/min c) ft.sec d)m/sec

2. It is possible to measure the angle of a component to an accuracy of one minute with-
 a) Bevel protractor ‘ b) Vernier Bevel protractor c) Combination set d) Sine bar with slip gauges

3.Operation of sharpening of grinding wheel is called -
a) Truing b) Aligning c) Dressing d) Balancing

4. Which is NOT the use of try square? a)Measuring right angle
b) Setting the work piece at 90°
c) Making straight lines at 90° against an edge
d) Checking squareness

5.Calculate the drill size for 20 mm reamed hole using the formula, undersize of hole = 0.3 mm and oversize for drill = 0.05 mm .
 a) 19.80 mm b) 19.75 mm c) 19.70 mm d)19.65 mm

6.The purpose of heat treatment is -
a)To make bright b) To change in shape c)produce certain required properties d)to prevent it from rusting

7. In a vernier micrometer, vernier scale is graduated on
a) thimble b) Spindle c) Barrel d) Frame



8. The bench vice spindle is made up of -
 a) Mild steel b) Cast iron c) Tool steel d)Bronze

9.What is the specification of vernier height gauge? . a) Length of scriber ' b) Height of base . c) Width of beam . d) Height of the main scale

10. A given coinponent cracked after heat treatment, the possible reason for this is . a) It was heated for a long time b) It was not properly cleaned before heating c) It was suddenly cooled in brine .d) It'was slowly cooled in air

11. Which one of the following bonds is most commonly used on grinding wheels?

a) Shellac b)Vitrified c) Rubber ‘ d)Silicon

 12. An accident is -
a) Un pleasant event b) Non-controlled event  c) Undesirable event d) All of these

13. The angle of drill grinding gauge is -
a) 59° b)'118° c)121° d) 124°

14. The rate of feed depends on -
 a) Finish required b) Quality of grinding wheel c) Material to be grind d) All of these .

15. A nut is to be made for screw of M1 0X1.5. What should be the size of drilled hole?
a)85mm b)9.0mm . c)9.5mm d)10.0mm

16. One component of C50 steel is heated to 830°C. Soaked at it for some time and then quenched in oil. Again it is heated to 600°C and quenched in oil. This process of heat treatment is called

a) Annealing b)Hardening & Tempering c) Normalising d)Case hardening ‘

17.In vernier bevel pretractor 23 degree is divided into how many vemier divisions-
 a) 25 b) 20 ‘ c) 12  d) 10

18. Grinding fluids are used to -
a) Reduce the friction between the wheel face & the job b) Wash away the chips
c) Prevent loading of wheel d) All of these .

19. Which one of the following is NOT a part of a centre lathe?
a) Saddle b) Feed rod  c) Arbor  d) Lead screw

20.Which one of the following materials IS used for making a grinding wheel -
a)Silicon carbide b) Granite c) Sand d) Calcium carbonate

21.You have to select a grinding wheel with suitable abrasive to grind the glass, Which type of abrasive you will select -
a)Emery b) Diamond c) Quartz d)Siiicon carbide

22. After heating up to required hardening temperature the tool steel is to be quenched to-
 a) Induce internal stresses b) To fall off-the scale c) To buildup hardening structure d) To return to its original structure

23.In which one of the following micrometers, the graduations on the thimble and sleeve are in reverse direction to that of outside micrometer-
a) Depth micrometer b) Inside micrometer
c) Tube micrometer d) Flange micrometer

24.After hardening process, the metal becomes more hardened and also will become more -
a) Ductile b) Brittle c) Malleable d) Tough

25.Which among the following centres suitable when work piece held between centres is to be turned at high speed -

a) Ball centre b) Half centre c) Revolving centre d) Pipe centre