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
- (C) Decrease
in roll radius
- (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 φ = 9 ₊0⁺⁰∙⁰¹⁵ mm. The corresponding shaft is of dimension φ = 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, φ9 +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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