CNC Technology Mid - I, September - 2014

1.Software used to translate NC program into code that is specific to the machine is
  • Coordinate
  • Post-processor
  • pre-processor
  • PTP
Answer: B
2.The most common programming format used in CNC programming systems is
  • Main
  • Letters
  • Sap
  • Word address
Answer: D
3.G-codes are used as _____ functions.
  • Miscellaneous
  • Machine
  • Preparatory
  • Work piece
Answer: C
4. ________ is a predetermined machining sequence used to simplify programming.
  • Carnot cycle
  • Rankine cycle
  • Canned cycle
  • Drawing cycle
Answer: C
5.The series of coordinate positions that determine the movement of a tool during a machining Operation is
  • Work piece path
  • Axis path
  • head path
  • Tool path
Answer: D
6.The coordinates of any point are calculated with reference to previous point
  • Absolute Co-ordinates
  • Incremental Co-ordinates
  • Cartesian Co-ordinates
  • None
Answer: B
7.The CNC system when first commercially introduced around
  • 1952
  • 1968
  • 1970
  • 1975
Answer: C
8.Which of the following is not the component of a DNC
  • Bulk Memory
  • Central computer
  • Networking
  • Tape Reader
Answer: D
9.The Machine operates with set the zero point at any position on the machine table in NC is
  • Origin
  • Floating zero
  • Fixed Zero
  • None
Answer: B
10.In milling and Turning operation _________ types of motion controller used
  • PTP
  • Straight Cut
  • Contouring
  • None
Answer: C
11.Light sensing component which gives output voltage when light falls on it is ______________
Answer: Photocell
12._____________ is used to decode the information from the punched tape
Answer: Tape Reader
13.___________ Ball screws and nut in CNC machines converts the rotary motion of a screw into linear motion of a slide
Answer: Re circulating
14.EIA Stands for________
Answer: Electronic Industry Association
15._______cycles is the set of instructions stored in the system and to perform a fixed or repeated sequence of operations
Answer: Canned
16.In typical NC systems the part program is stored on a ___________ tape.
Answer: Punched
17.A part program is a combination of _______________ and machine specific instructions.
Answer: Machine tool code
18.The first step in NC programming is to produce a ______________ for the part using its engineering drawing.
Answer: Process plan
19.In point to point machining the cutting tool performs operations on the work piece at______________ points.
Answer: Specific
20.According to the type of machining NC machine tools can be divided in to _____________ and________________
Answer: Point to point & continuous path machining