Workshop Calculation Semester 4 July 2018

Workshop Calculation & Science - Semester IV

1. For a sample to be truly representative of the population, it must truly be:
   a) Fixed
   b) Random ✔
   c) Specific
   d) Casual
2. If the sample is truly representative of the population, then the characteristics of the sample can be considered to be the same as those of the ______ population.
   a) Fixed
   b) Selected
   c) Random
   d) Entire ✔
3. The purpose of heat treatment is:
   a) To change the mechanical properties of steel
   b) To change the internal structure of steel ✔
   c) To change the appearance of the component
   d) To change the chemical properties of steel
4. Where permanent magnet is used?
   a) Relays
   b) Ignition coil
   c) Solenoids
   d) Moving coil instruments ✔
5. Which one of the following statement is NOT correct in respect of ‘V’ belt drive:
   a) It is compact
   b) It can be easily replaced and maintenance is easy
   c) It causes less noise and vibration
   d) It is used where distance between driver & driven pulleys is more ✔
6. In acceptance sampling, when there is a finite probability that the lot may be accepted even if the quality is not really good, is called:
   a) Consumer’s risk ✔
   b) Producer’s risk
   c) Operator’s risk
   d) Owner’s risk
7. Co-efficient of friction can be found by:
   a) Normal reaction / Frictional force
   b) Frictional reaction / Normal force
   c) Normal force / Frictional reaction
   d) Frictional force / Normal reaction ✔
8. Which is NOT the property of temporary magnet?
   a) Strength can be varied
   b) Polarity can be changed
   c) Magnetization can be controlled
   d) N & S poles are always permanent ✔
9. The objective of earthing or grounding is:
   a) To provide as low resistance possible to the ground ✔
   b) To provide as high resistance possible to the ground
   c) To provide flow of positive, negative and zero sequence current
   d) None of these
10. Which of the following is not a sampling plan?
    a) Single sampling plan
    b) Double sampling plan
    c) Triple sampling plan ✔
    d) Sequential sampling plan
11. What is the main purpose of annealing?
    a) To improve machinability ✔
    b) To improve magnetism
    c) To increase hardness
    d) To increase toughness
12. In which one material insulators are made:
    a) Porcelain ✔
    b) Rubber
    c) Hard rubber
    d) Fiber
13. A vehicle has 1000 kg mass and co-efficient of friction between tyres and road is 0.4. What is the maximum braking force?
    a) 3924 N ✔
    b) 9180 N
    c) 1000 N
    d) 400 N
14. From which material, magnets are made:
    a) High carbon steel
    b) Alnico alloy steel ✔
    c) Low carbon steel
    d) High speed steel
15. If the centre to centre distance between meshing gears is 150 mm and velocity ratio is 2:1, what will be pitch diameters?
    a) 50 mm and 100 mm
    b) 100 mm and 200 mm ✔
    c) 150 mm and 300 mm
    d) 200 mm and 400 mm
16. If class mid points are 25, 32, 39, 46, 53, 60, the class interval is:
    a) 5
    b) 7 ✔
    c) 8
    d) 6
17. The number of observations in a particular class is called:
    a) Width of the class
    b) Class mark
    c) Frequency ✔
    d) None of these
18. Which one is the application of temporary electromagnet?
    a) Microphones
    b) Moving coil instruments
    c) Cut outs
    d) Ear phones ✔
19. Convert into ordinary frequency distribution:
    Less than 3 = 5, less than 6 = 12, less than 9 = 25, less than 12 = 33
    a) 5, 7, 13, 8 ✔
    b) 6, 6, 14, 7
    c) 4, 8, 12, 9
    d) 6, 8, 12, 7
20. Which material are mostly used for making electromagnet?
    a) Silicon steel ✔
    b) Tungsten steel
    c) Alnico alloy steel
    d) Cast iron
21. In double sampling plan, if defects lie between C1 and C2 then:
    a) Accept the lot
    b) Reject the lot
    c) Take another sample ✔
    d) None of these
22. Heat treatment of metals is necessary:
    a) To produce desired properties ✔
    b) To make good appearance
    c) To increase strength
    d) To make rust proof
23. A machine shaft runs at 25 rpm, spindle at 125 rpm. If spindle pulley is 20 cm, main pulley diameter is:
    a) 10 cm
    b) 20 cm
    c) 50 cm
    d) 100 cm ✔
24. Which one is useful friction?
    a) Wheel hub bearings
    b) Crankshaft bearings
    c) Ring in cylinders
    d) Brake shoe linings ✔
25. When two magnets are kept as shown (S facing S), there will be:
    a) Rotation
    b) No change
    c) Repulsion ✔
    d) Attraction