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GATE Mechanical 1993 Question

Signle Correct Answer
With reference to $$NC$$ machines, which of the following statements is wrong?
A
Both closed-loop and open-loop control systems are used
B
Paper tapes, floppy tapes and cassettes are used for data storage
C
Digitisers may be used as interactive input devices
D
Post processor is an item of hardware

GATE Mechanical 1997 Question

Signle Correct Answer
In a point to point control $$NC$$ machine, the slides are positioned by an integrally mounted stepper motor drive. If the specification of the motor is $$1$$ deg/pulse, and the pitch of the lead screw is $$3.6$$ $$mm,$$ what is the expected positioning accuracy?
A
$$1$$ micron
B
$$10$$ micron
C
$$50$$ micron
D
$$100$$ micron

GATE Mechanical 1998 Question

Subjective Type Answer by Yourself
A cylinder of $$155$$ $$mm$$ is to be reduced $$150$$ $$mm$$ diameter in one turning cut with a feed of $$0.15$$ $$mm$$/ revolution and a cutting speed of $$150$$ $$m/min$$ on a $$NC$$ lathe. What are the programmed spindle speeds programmed feed rate, and the material removal rate?

GATE Mechanical 2000 Question

Signle Correct Answer
In finish machining of an island on a casting with $$CNC$$ milling machine, an end mill with $$10$$ $$mm$$ diameter is employed. The corner points of the island are represented by $$(0,0), (0,30), (50,30)$$ and $$(50,0)$$. By applying cutter radius right compensation, the trajectory of the cutter will be
A
$$(-5,0), (-5,35), (55,35), (55,-5), (-5,-5)$$
B
$$(0,-5), (55,-5), (55,35), (-5,35), (-5,-5)$$
C
$$(5,5), (5,25), (45,25), (45,5), (5,5)$$
D
$$(5,5), (45,5), (45,25), (5,25), (5,5)$$

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