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BARC 2021 ME: Manufacturing & Engineering Materials : Nuclear Quiz 2
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Question 1
In an Electrochemical machining process an iron( atomic weight=56 gm and valency=2) is used having cross section of 0.5x0.5 cm2. A current of 1000 A is passed through the electrolytic solution and the density of iron is given as 7.86gm/cm3. Find the feed rate of the electrode in cm/sec.
Question 2
Which of the following is the reason for reduced strength in brazing, when joint thickness is below optimum thickness?
Question 3
Which of the following G-codes represents circular interpolation in counter clockwise direction?
Question 4
The process of making hollow castings of non-circular shape and desired thickness by permanent mould without the use of cores is known as ____.
Question 5
An orthogonal turning operation is carried out under the following conditions: rake angle = 5 ° and Chip thickness ratio is given 0.6. The shear angle (in degrees) in this turning process is_______
Question 6
A strip with a cross-section of 150 mm × 6 mm is being rolled with 30% reduction in thickness of strip using 400 mm diameter rolls. The Roll Bite Angle (in degrees) is _____.
Question 7
The diameter of a recessed ring was measured by using two spherical balls of diameter d2 = 60 mm and d1 = 40 mm as shown in the figure.
The distance H2 = 35.55 mm and H1 = 20.55 mm.
The diameter (D, in mm) of the Ring gauge is_____.
The distance H2 = 35.55 mm and H1 = 20.55 mm.
The diameter (D, in mm) of the Ring gauge is_____.
Question 8
A CNC vertical roiling machine has to cut a straight slot of 20 mm width and 4 mm depth by a cutter of 15 mm diameter between points (0, 0) and (50, 50) on the xy plane (dimensions in mm). The feed rate used for milling is 45 mm/min. Milling time for the slot (in seconds) is ___________.
Question 9
Step angle of the stepper motor is 
degrees per pulse and the pitch of lead screw is p mm. If gear ratio is G, then number of pulses required to achieve a linear movement of x mm is,
degrees per pulse and the pitch of lead screw is p mm. If gear ratio is G, then number of pulses required to achieve a linear movement of x mm is,Question 10
Annealing of white cast iron produces______.
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