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# GATE Mechanical 1993 Question

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

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

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
$(-5,0), (-5,35), (55,35), (55,-5), (-5,-5)$
$(0,-5), (55,-5), (55,35), (-5,35), (-5,-5)$
$(5,5), (5,25), (45,25), (45,5), (5,5)$
$(5,5), (45,5), (45,25), (5,25), (5,5)$