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BARC OCES 2022 Quiz 11
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Question 1
In an orthogonal machining operation:
Uncut thickness = 0.5 mm, Cutting speed = 20 m/min
Width of cut = 5 mm, Chip thickness = 0.7 mm
Thrust force = 200 N Cutting force = 1200 N
Rake angle = 15 °
Assume Merchant’s theory. The values of shear angle and shear strain, respectively, are ____________.
Uncut thickness = 0.5 mm, Cutting speed = 20 m/min
Width of cut = 5 mm, Chip thickness = 0.7 mm
Thrust force = 200 N Cutting force = 1200 N
Rake angle = 15 °
Assume Merchant’s theory. The values of shear angle and shear strain, respectively, are ____________.
Question 2
The difference in pressure (in N/m2) across an air bubble or diameter 0.002 m immersed in water (surface tension = 0.072 N/m) is ______.
Question 3
One kg mass of iron at 1200 K is allowed to cool to 400 K and environment is at 300 K. The specific heat of steel is 0.5 kJ/kg. K. The Irreversibility is
Question 4
For the fully developed laminar flow and heat transfer in a uniformly heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be
Question 5
The figure below shows the TTT diagram of eutectoid steel for which the following microstructures are to be matched :
1) Fine pearlite
2) Martensite
3) Bainite
4) Coarse pearlite
The correct match will be :
Question 6
A simple spring-mass vibrating system has a natural frequency of N. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
Question 7
Two helical spur gear are in mesh with angular velocity 200 rpm for gear and 600 rpm for the pinion. Assuming no slip occur between the meshing gears. What will be the value of gear ratio for the following gear arrangement.
Question 8
Determine the ratio of the buckling strength of a solid column to that of a hollow column of the same material having the same area of cross section. The internal diameter of the column is half of the external diameter. Both columns are identical length and are pinned or hinged at the ends:
Question 9
Two vectors P and Q start from a single point O. For the vectors to be perpendicular to each other at point O?
Question 10
Match List-I (type of gear failure) with List-II (Reasons) select the correct answer using the code given below the lists:
List-I
A). Scoring
B). Pitting
C). Scuffing
D). Plastic flow
List-II
1). Oil film breakage
2). Yielding of surface under heavy loads
3). Cyclic loads causing high surfaces stress
4). Insufficient lubrication
List-I
A). Scoring
B). Pitting
C). Scuffing
D). Plastic flow
List-II
1). Oil film breakage
2). Yielding of surface under heavy loads
3). Cyclic loads causing high surfaces stress
4). Insufficient lubrication
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ESE & GATE MEGeneralMar 18ESE & GATE ME
