Material properties and Metal Forming (Machining) Processes - Set 02 - ObjectiveBooks

# Practice Test: Question Set - 02

1. In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
(A) Increases continuously
(B) Decreases continuously
(C) Decreases becomes stable and then increases
(D) Increases, becomes stable and then decreases

2. Match the following metal forming processes with their associated stresses in the work piece.
Metal forming process                          Types of stress
1. Coining                                             P. Tensile
2. Wire Drawing                                Q. Shear
3. Blanking                                          R. Tensile and compressive
4. Deep Drawing                                S. Compressive
(A) 1-S, 2-P, 3-Q, 4-R
(B) 1-S, 2-P, 3-R, 4-Q
(C) 1-P, 2-Q, 3-S, 4-R
(D) 1-P, 2-R, 3-Q, 4-S

3. In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰∙⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰∙⁰³⁰, the maximum interference (in microns) in the assembly is
(A) 40
(B) 30
(C) 20
(D) 10

4. During normalizing process of steel, the specimen is heated
(A) Between the upper and lower critical temperature and cooled in still air.
(B) Above the upper critical temperature and cooled in furnace.
(C) Above the upper critical temperature and cooled in still air.
(D) Between the upper and lower critical temperature and cooled in furnace.

5. A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
(A) 120
(B) 170
(C) 180
(D) 240

6. A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25 mm. The percentage change in diameter is
(A) 0
(B) 2.07
(C) 20.7
(D) 41.4

7. The maximum possible draft in cold rolling of sheet increases with the
(A) Increase in coefficient of friction
(B) Decrease in coefficient of friction
(D) Decrease in roll velocity

8. The operation in which oil is permeated into the pores of a powder metallurgy product is known as
(A) Mixing
(B) Sintering
(C) Impregnation
(D) Infiltration

9. A hole is of dimension Ï† = 9 ₊0⁺⁰∙⁰¹⁵ mm. The corresponding shaft is of dimension Ï† = 9 ₊0.001⁺⁰∙⁰¹⁰ mm. The resulting assembly has
(A) Loose running fit
(B) Close running fit
(C) Transition fit
(D) Interference fit

10. The crystal structure of austenite is
(A) Body centered cubic
(B) Base centered cubic
(C) Hexagonal closed packed
(D) Body centered tetragonal

11. The material property which depends only on the basic crystal structure is
(A) Fatigue strength
(B) Work hardening
(C) Fracture strength
(D) Elastic constant

12. A shaft has a dimension, Ï†9 +0.025⁺⁰∙⁰⁰⁹, the respective values of fundamental deviation and tolerance are
(A) −0.025, ±0.008
(B) −0.025, 0.016
(C) −0.009, ± 0.008
(D) −0.009, 0.016

13. In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
(A) Circular interpolation in counter clockwise direction and incremental dimension
(B) Circular interpolation in counter clockwise direction and absolute dimension
(C) Circular interpolation in clockwise direction and incremental dimension
(D) Circular interpolation in clockwise direction and absolute dimension

14. Friction at the tool-chip interface can be reduced by
(A) Decreasing the rake angle
(B) Increasing the depth of cut
(C) Decreasing the cutting speed
(D) Increasing the cutting speed

15. The effective number of lattice points in the unit cell of simple cubic, body centered cubic, and face centered cubic space lattices, respectively, are
(A) 1, 2, 2
(B) 1, 2, 4
(C) 2, 3, 4
(D) 2, 4, 4

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