1. Hot Working Operations Are Carried out Whilst the Workpiece Is Heated To

MANUFACTURING

1. Hot working operations are carried out whilst the workpiece is heated to

(a) 1000 0 C. (b) Melting temperature.

(c) Recrystallization temperature. (d) Any temperature above room temperature.

2. The mechanical properties of products manufactured by cold working compared with hot

Working show:-

(a) Higher hardness and strength. (b) Closer tolerance.

(c) Better surface finish. (d) a,b and c.

3. The structures of cast parts usually are

(a) Isotropic. (b) Directional. (c) Relatively coarser (d )Both a & c.

. compared to those produced by hot working.

4. Parts produced by cold rolling usually display a structure of

(a) Equal grains oriented in all directions. (b)Grains of all sizes and orientations.

( c) Fine grains oriented in the direction of rolling. (d) Coarse grains

5. Parts produced by forging include

(a) Shafts. (b) Balls. (c) Chains. (d) All of the above.

6. Rebars and steel sheets are produced by

(a) Casting. (b) Forging. (c) Drawing. (d) Rolling.

7. Electrical Copper cables are produced by

(a) Casting. (b) Extrusion and wire drawing. (c) Extrusion. (d) Rolling.

8. The structure exhibited by hot rolling consists of

(a) Recrystallized grains. (b) Fragmented grains (c) Grains of all sizes and orientations (d) none of the above

9. Bending a lead tube at room temperature is

(a) Hot working. (b) Cold working (c) warm working (d) annealing

10. The ability of a material to withstand bending or shear stresses without fracture is known as

(a) Stiffness. (b) Toughness. (c) Plastic deformation (d) ductility .

11. The capacity of a substance to undergo deformation under tension without rupture, as in wire or tube drawing operations is known as

(a) Toughness. (b) Ductility. (c) Malleability. (d) Elasticity.

12. The capacity of a substance to undergo deformation under compression without rupture, as in forging or rolling operations is known as

(a)Toughness. (b) Ductility. (c) Malleability. (d) Elasticity.

13. THE ABILITY OF MATERIAL TO RESIST PLASTIC DEFORMATION IS KNOWN AS

(a) STIFNESS (b) TOUGHNESS (C) PLASTIC DEFORMATION (d) HARDNESS

14. Large castings of complicated shapes are made from cast iron due to it's

(a) High melting point compared to steel (b) High fluidity (c) Low cost

(d) Both b and c (e) All of the above.

15. Welding is a process conducted to

16. (a) Assemble parts (b) repair parts (c) provide a hard layer on the surface (d) all of the above.

17. In the designation used for identifying electrodes E 6010 60 describes (a) the welding position (b) cellulose free (c) cellulose containing (d) the strength of the electrode.

18. In the designation used for identifying electrodes E 6013 the 1 describes (a) the welding position (b) cellulose free (c) cellulose containing (d) the strength of the electrode.

19. In the designation used for identifying electrodes E 6013 the 3 describes (a) the welding position (b) cellulose free (c) cellulose containing (d) the strength of the electrode.

MECHANICAL TESTING

1. The maximum force required to fracture in tension a bar of unit cross sectional area is known as

(a) Yield strength. (b) Ultimate tensile strength. (c) Fracture stress d) shear stress

2. Young's Modulus is a measure of the……… of the material in tension.

(a) Elasticity (b) Stiffness (c) Toughness d) plasticity

3. A direct measure of ductility from the tension test is the

(a) Strain. (b) Percentage elongation. (c) Yield strength d) UTS

4. The resistance of a surface to abrasion or indentation is known as

(a) Tensile strength. (b) Creep strength. (c) Ductility. (d) Hardness.

5. The offset yield stress is

a) The greatest stress the material can withstand without any permanent strain on unloading.

b) The stress required to produce a small amount of plastic deformation = 0.002

c) The maximum stress the material can withstand.

(d) Non of the above.

6. Strength properties of material are designated by

(a) UTS (b) Yield stress (c) Toughness (d) Both a & b

7. The property measured by loading a specimen from behind the notch by the impact of heavy

Swinging pendulum is the

(a) Tensile strength. (b) Fatigue strength. (c) Impact Toughness. (d) Creep strength.

8. A proper selection of a material suitable for applications subjected to impact loads should be

Based on the property of

(a) Impact toughness. (b) Hardness. (c) Ductility. (d) Toughness.

9. The impact test is used to measure the amount of energy absorbed for fracture under

(a) Sudden impact. (b) Slow loading conditions. (c) High temperature. (d) Changing loads.

10. Metals subjected to fluctuated or repeated forces fail at

(a) Lower (b) Higher (c) The same d) none of the above

Stresses as those from the same metals carrying dead steady loads.

11. The fatigue limit is usually

(a) 0.5 of the UTS. (b) 1.3 of the UTS. (c) The same as yield strength. (d) Has no relation.

12. During a tensile test on a cold worked brass the following data were obtained for force and corresponding extension.

Ext. mm / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 4.0
Force KN / 23 / 46 / 69 / 82 / 89 / 94 / 102 / 110 / 123 / 131 / 136 / 139 / 132

Using the following information:

Diameter of test piece 16 mm.

Gauge length 80 mm.

Maximum load =139 KN.

Break (fracture) load =118 KN.

Final extension =4.3 mm.

Draw the stress-strain curve and answer.

0.2% offset yield strength is (a) 340 N/mm2 (b) 230 N/mm2 (c) 450 N/mm2 (D) 450KN .

13. During a tensile test on a cold worked brass the following data were obtained for force and corresponding extension.

Ext. mm / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 4.0
Force KN / 23 / 46 / 69 / 82 / 89 / 94 / 102 / 110 / 123 / 131 / 136 / 139 / 132

Using the following information:

Diameter of test piece 16 mm.

Gauge length 80 mm.

Maximum load =139 KN.

Break (fracture) load =118 KN.

Final extension =4.3 mm.

Draw the stress-strain curve and answer.

UTS are: - (a) 340 N/mm2 (b) 230 N/mm2 (c) 690 N/mm2 (d) 690KN .

14. During a tensile test on a cold worked brass the following data were obtained for force and corresponding extension.

Ext. mm / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 4.0
Force KN / 23 / 46 / 69 / 82 / 89 / 94 / 102 / 110 / 123 / 131 / 136 / 139 / 132

Using the following information:

Diameter of test piece 16 mm.

Gauge length 80 mm.

Maximum load =139 KN.

Break (fracture) load =118 KN.

Final extension =4.3 mm.

Draw the stress-strain curve and answer.

And % elongation of the material is (a) 20% (b) 5.4% (c) 10%. D) 15%

14. During a tensile test on a cold worked brass the following data were obtained for force and corresponding extension.

Ext. mm / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 4.0
Force KN / 23 / 46 / 69 / 82 / 89 / 94 / 102 / 110 / 123 / 131 / 136 / 139 / 132

What is the elongation exhibited by a 3mm wire made from the same material, if carrying a load of 1 KN is a) 0.05% b)0.1% c)0.17% d) 0.25%

15. During a tensile test on a cold worked brass the following data were obtained for force and corresponding extension.

Ext. mm / 0.1 / 0.2 / 0.3 / 0.4 / 0.5 / 0.6 / 0.8 / 1.0 / 1.5 / 2.0 / 2.5 / 3.0 / 4.0
Force KN / 23 / 46 / 69 / 82 / 89 / 94 / 102 / 110 / 123 / 131 / 136 / 139 / 132

What is the elongation if a 3 mm wire from the same material carry load of 2KN: a) 0.1% b) 0.2%

C) 0.3% d) 0.4%

16. The critical crack length for a through crack contained within a thick plate of Al alloy of K1c=23.5Ksi (in) 0.5 and sf = 90 ksi is a) 0.01inch b) 0.02inch

C) 0.03 inch d) 0.04inch

17. The endurance limit of ferrous alloys is defined as: (a) The stress below which the alloy does not fail when exposed to dynamic load. (b) The stress below which the alloy exhibits a specific amount of strain when exposed to dynamic load. (c) The stress below which the alloy does not fail when exposed to constant tension stress. (d) The stress below which the alloy does not fail when exposed to constant compressive stress.

18. When designing for high temperature service, one must consider (a) tensile properties only (b) fatigue properties only (c) hardness properties only (d) creep properties as well as hardness and strength at considered temperature.

19. A 13 mm-diameter tensile specimen has a 50 mm gauge length. The load corresponding to 0.2 percent offset yield stress is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gauge length at fracture is 65 mm.

The yield strength of this material is: - a) 600Mpa b) 600KN c) 500KN d) 500Mpa

20. A 13 mm-diameter tensile specimen has a 50 mm gauge length. The load corresponding to 0.2 percent offset yield stress is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gauge length at fracture is 65 mm.

The UTS of this material is :- a)500Mpa b)600KN c)620Mpa d)620KN

21. A 13 mm-diameter tensile specimen has a 50 mm gauge length. The load corresponding to 0.2 percent offset yield stress is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gauge length at fracture is 65 mm.

The fracture stress of this material is: - a)540Mpa b) 540KN c)600Mpa d)650Mpa

22. A 13 mm-diameter tensile specimen has a 50 mm gauge length. The load corresponding to 0.2 percent offset yield stress is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gauge length at fracture is 65 mm.

The % elongation of this material is: - a) 20% b) 25% c) 30% d) 35%

23. A 13 mm-diameter tensile specimen has a 50 mm gauge length. The load corresponding to 0.2 percent offset yield stress is 6800 Kg and the maximum load is 8400 Kg. Fracture occurs at 7300 Kg. The diameter after fracture is 8 mm and the gauge length at fracture is 65 mm.

The %reduction of area is: - a) 50% b) 55% c) 62% d) 70%

24. The maximum force that could be supported by a 50 mm diameter rod of yield strength 620 N/mm2 In static loading conditions using a factor of safety of 2 is :- (a) 610 MPa (b) 610 KN (c) 720 K d)720 MPa

25. The maximum force that could be supported by a 50 mm diameter rod of UTS 950 N/mm2 in dynamic loading conditions using a factor of safety of 3 is (a) 310 KN (b) 310 MPa (c) 620K d) 620 Mpa.

26. the maximum force that can be supported by a 50 mm diameter rod of stress for rupture in 1000 hr of 230 N/mm2 at 5000C) at high temperature service conditions based on 1000 hr rupture life at 5000C , using a factor of safety of 3 is :- (a) 150 Mpa (b) 150 KN (c) 85 KN (d) 85 Mpa.

27. During a tensile test on 0.2% C plain C steels the following data were obtained for stress and corresponding strain.

.001 / .002 / .005 / .01 / .02 / .04 / .06 / .08 / .10 / .12 / .14 / .16 / .18
Stress Ksi / 0 / 30 / 55 / 60 / 68 / 72 / 74 / 75 / 76 / 73 / 69 / 65 / 56