61. The primary purpose of a sprue in a casting mould is to
62. 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
63. The lip angle of a single point tool is usually
64. In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called
65. In drilling operation, the metal is removed by
66. In ultrasonic machining, the metal is removed by
67. The rear teeth of a broach
68. A drill mainly used in drilling brass, copper or softer materials, is
69. Crater wear leads to
70. Which of the following parameters influence the axial feed rate in centerless grinding?
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