DSSSB Machinist Grinder Instructor Paper 2014

DSSSB Machinist Grinder Instructor Paper 2014

In part programming, interpolation is used for obtaining __________trajectory.
(a) Helical
(b) Pentagonal
(c) Triangular
(d) Zigzag

Point-to-point system is used for
(a) Drilling
(b) Parting
(c) Grooving
(d) Facing

In how many ways, NC motion control system can be classified ?
(a) 2
(b) 3
(c) 4
(d) 5

Which of the following is NOT the advantages of NC machiens ?
(a) Higher flexibility
(b) Improved quality
(c) Reduced scrap rate
(d) Improved strength of the component (material properties)

NC machining centres do NOT include operations like
(a) Milling
(b) Boring
(c) Welding
(d) Tapping

What is the purpose of using recirculating ball screw nut mechanism in CNC machine ?
(a) To reduce the setup time
(b) For higher surface finish
(c) For carrying out up milling
(d) To remove backlash

The function of feed rod in the lathe is
(a) To convert the rotary motion into linear motion of the tool
(b) To convert the rotary motion into circular motion of tool
(c) To convert the rotary motion into circular motion of the tail stock
(d) None of the above

Length standrds in the form of blocks or bars, with two faces or ends which are defined distance apart are called
(a) End standards
(b) Line standards
(c) Comparators
(d) Gauges

The surface joining the crest and the root of a thread is known as
(a) Flank
(b) Shank
(c) Pitch surface
(d) All of the above

Which type of grinding wheel is used to sharpen the milling cutter ?
(a) Universal type grinder
(b) Roller grinder
(c) Diamond grinder
(d) None of the above

The three classes of fits as per BIS system are
(a) Clearance fit, Interference fit, Transition fit
(b) Medium fit, Push fit and Tight fit
(c) Flat fit, Round fit, Square fit
(d) Sliding fit, Loose fit, Shrinkage fit

Interchange ability is normally applied for
(a) Repairing the parts
(b) Mass production
(c) Single Piece production
(d) All of these