T/R S 4

Turner theory sem 4 jan 2017 questions

For cutting taper threads on a lathe the cutting tool is set..........
a) Perpendicular to taper surface  b) Half the taper angle
c) Perpendicular to lathe axis.       d) Half the angle of thread

For case hardening the first stage is carburizing. By carburizing it is meant:-
a) Increasing the percentage of carbon of the steel piece
b) Increasing the percentage of carbon of the core of the piece
c) Increasing the percentage of carbon on the surface
d) Decreasing the percentage of carbon of the steel piece.

Which of the following statements is correct:-
a) Interchangeability of parts may be obtained by adopting the systems oflimits&fits.
b) The BIS system oflimits&fils does not give the desired fit.
c) Interference fit is always designed with a positive clearance
d) Transition fit is always specified with a negative clearance.

Mass produced components should be interchangeable. One of the following is most important factor required to achieve the interchangeability in mass production:-

a) Dimensional accuracy
c) Geometrical accuracy
b) Standardization
d) Surface finish

The external surface of the pan made of mild steel can be hardened by-
a) Tempering b) Case hardening     c) Normalising d) Hardening

Which one of the following statements about programming of NC machine is curret
a) Programming is only possible on central server
b) Programming can be entered on control panel and can be read from a tape
c) Modification of the programme on the control panel is not possible
d) Entering the programme is only possible directly on the control panel

The process of producing a component with tough and ductile core and a hard outer surface is known as:-
a) Hardening b) Tempering c) Annealing d) Case hardening

If the dimension of a component is finished within the limits of size, then it will be--
a) Minimum size      b) Acceptable size    c) Basic size d) Rejected size

One component of C50 steel is heated to 830°C, soaked at it for some time and then quenched m oil. Again it is heated to 600°C and quenched in oil. What is the name of the process,-
a) Annealing   b) Normalising   c) Hardening & tempering   d) Case hardening

A CMC lathe is programmed and set to turn a diameter of 50 mm, but on trial run the diameter is found to be 50.01 mm. which one of the following will ensure correct diameter during production:-
a) Increase the tool offset by 0.1 mm           b) Decrease the tool off-set by 0 05 mm
c) Increase the tool offset by 0.05 mm        d) Decrease the tool off-set by 0.01 Z

h£ «u7?f heati"8 StCel l° ab°Ut 4°° ab0VC me critical temperature and cooling
it in still air to room temperature is known as-- ^
a) Hardening b) Normalising        c) Annealing d) Case hardening

The point to point is the simplest form of NC. The operation done in this system is:-
a) Drilling b) Boring c) Straight line milling d) Any of these

Under the terminology of the IS system of limits the term "tolerance" is defined as the difference between the:-
a) Maximum limit and the basic size
c) Maximum limit and Minimum limit
b) Minimum limit and the basic size
d) Actual size and the basic size.

Which one of the following is the solid   carburizing material?

a) Petrol b) Ammonia c) Kerosene
d) charcoal

Which one of the following is NOT the advantage ofCNC machine?
a) Reduces inspection time
c) Higher initial cost
b) Reduces tooling time
d) Higher rate of production

CNC machines are not normally operated, but they are controlled by means of a:-
a) Cam
b) Programme
c) Operator
d) Plug board system

The purpose of annealing is to..................
a) Improve machinabihty
b) Increase hardness
c) Improve magnetism
d) Increase toughness

Heat treatment of metals is necessary to_
a) Make a good appearance on the component
b) Produce certain desired property
c) Increase strength of metal
d) Make the metal rust proof

A point to point control system is suitable only for one of the following application:-
a) Milling profile      b) Turning c) Drilling d) Grinding

CNC lathe machines have built in co-ordination measuring system. The zero position
the co-ordinate system is called_.
a) Reference point b) Programme zero point
c) Machine zero point d) Work zero point

In M - function - M - 03 means:-
a) Spindle rotation (CW) b) Spindle rotation (CCW)
c) Coolant on d) C oolant off

In a single spindle automatic lathe for bar work has a capacity of <D25mm (which means
that the size of round bar that can be hold is O 25mm) If we want to load square rod in
this automatic lathe the maximum size of the square rod can be loaded is_
a) 17.67 mm b) 312.5 mm c) 25 mm d) 5 mm

The hardening temperature^of H.S.S tool is:-
a) 850°C
b) 1250°C
c) 950°C
d) 750°C

On which unit is the tool setting done on NC machine:-
a) On special device away from the machine
b) On machine it while other operations are being performed
c) On NC machine during idle time
d) On the presetting device

Single spindle auto lathe for bar work has its slide movements controlled by cams for the
production of a typical component the cams are fixed on the cam holders
three cam shafts of the machine. The number of revolutions made by the cam shafts will
be equal to:-
a) Number of components produced per hour.
b) 1/3 rpm of the main spindle
c) Thrice the number of components produced per minute
d) rpm of the main spindle

The direction of the predominant surface pattern ordinarily determined by the production
method is known as>
a) Lay b) Roughness c) Waviness d) Surface texture

Lead is the metal used for balancing weight during lathe face plate work. The reason for
this is that lead is_.
a) Most ductile b) Heaviest c) Toughest d) Most elastic

Which one of the following operations is NOT automatic on a single spindle auto lathe?
a) Bar loading b) Bar feeding
c) Coolant circulation d) Collet opening & closing

A phosphor bronze split bearing bush is to be finish machined on a centre lathe, the
slitting of the bush into two halves is done....................
a) Before beginning to rough turn and bore the pot
b) After rough oversize turning the collars and the step without boring
c) After rough oversize turning the collars, step and rough boring
d) After completely finish turning the collars, step and finish boring.

While measurine zero offset in CNC machine the machine should be in:-
a) MD1 mode b) Jog modec) Automatic mode d) Preset mode

When machining irregularly shaped work held on face plate, counter balancing is done by clamping weights.
This is done:-
a) Before mounting the face plate on the spindle nose.
b) After mounting the face plate on the spindle nose and revolving work at the slow rpm
c) After mounting the face plate on the spindle nose and keeping spindle in neutral position
d) After taking the rough cut.

Which one of the following collets is suitable to hold a 25 mm diameter rod accurately
in a single spindle auto Jathe?
a) Draw in collet
c) Dead length collet
b) Push type collet
d) Master collets with pads

CAD and CAM are related througrr-

a) NC tapes
c) Parts production testing
b) Automatic tools
d) Common data base

Automatic lathes are capable of performing preset cycle of operation, the number of
components produced per cycle of operations depends on:-
a) The number of toolings
b) The design of cams controlling the slide movements
c) The number of spindles on the machine
a) The range of speeds and feeds

A multi start square thread is to be cut on a lathe with single point tool. Which one of the
following angles of the tool is to be ground by taking into consideration, the thread helix
a) Side relief b) Front clearance    c) Side rake d) Side clearance


A fixture does not ......
a) Holds the workpiece  
b) Locate the workpiece
c) Guide the tool
d) All of these

Fixture are used ......
a) For holding and guiding the tool in drilling, reaming or tapping operation
b) For holding the work in milling, grinding, planning, or turning operation
c) To check the accuracy of workpiece
d) None of the above

Which angle is make side and surface of angle plate?
a) 200°
b) 450°
c) 900°
d) 1200°

The slot is cut in angle plate because of .......
a) For lift by hook
b) For keep job straight
c) For less weight
d) For tighten nut & bolt

........... grade angle plate is used in generally machine shop.
a) A   b) B   c) C   d) D

........is a heat treatrnent process for surface hardening.
a) Carburising
b) Normalising
c) Annealing
d) Tempering

Fixture is most productive tool because .......
a) Hold the job
b) Locate the job
c) Both (a) & (b)
d) Guide the cutting tool

Feed is given ......... types for thread cutting.
a) 4   b) 2   c) 3   d)5

Lead ......... 
a) Pitch x no. of start
b) Pitch x no. of lead
c) Lead x Root
d) Root x Crest

The process of steel is heated or chilled for achieve desired property is known as ........
a) Tempering
b) Hardening
c) Annealing
d) Heat treatment

The cutting edge of a chisel should be ......
a) Hardened 
b) Tempered
c) Hardened & Tempered
d) Case hardened

Tempering is done to ......
a) Increase toughness & Decrease brittleness
b) Cutting edge is hardened
c) Cutting edge is softened
d) Cutting edge is brittled

GS4 is means a 
a) Select zero offset
b) Zero offset
c) Offset zero
d) zero name

G is symbol of .......
a) Start function  
b) End fUnction
c) Medium ftmction
d) All ofthese

PLC is part of .........
a) PNC    b) CMG c) DMC   d) CNC

Tool offset function is indicated by ........ word.
a) A   b) B   c) C   d) D
The translator program used assembly language is called ...
a) Compiler
b) Interpreter
c) Assembler
d) Translator

The value of one micron is —
a) 0.001mm
b) 0.01mm
c) 0. 1mm
d) 0.001 mm

Quality control is main purpose of ......... cost product used.
a) More b) Less
c) Average d) All of these

The process of improving the cutting action of grinding wheel is called ........
a) Truing
b) Dressing
c) Facing
d) Clearing

In order achieve a specific finish in single point turning, the most important to be controlled is .......
a) Depth of cut
b) Cutting speed
c) Feed
d) Tool rake angle

Work done in metal cutting depends on ......
a) Cutting force & Cutting speed
b) Cutting speed & Heat generated
c) Depth of cut & Cutting speed
d) Cutting force & depth of cut

If chip thickness increases tool wears at .......
a) Less
b) Moderate
c) More rapid
d) None of these

Cutting speed is expressed in ......
a) Meter per second
b) Meter per minute
c) Millimeter per minute
d) Centimeter per minute

The factor which affects the tool life is ...........
a) Tool geometry
b) Cutting speed
c) Feed rate
d) All of these

Larger end cutting edge angletool life.
a) Increases
b) Decreases
c) No effect  
d) Constant

Pressure applied on workpiece in case of lapping operation is —
a) 0.01kg/cmsq
b) 0.1kg/cmsq
c) 0.5kg/cmsq
d) 1.0kg/cmsq

Honing is used to .......
a) Correct ovality
b) Waviness of axis
c) Non-parallelism of cylindrical features
d) All of these

Machine lapping is performed on  ........
a) Roller bearings
b) Crankshafts
c) Pistons
d) All of these

The usual amount of stock left for removal by honing is from ......
a) 0. 1mm to 0.25mm
b) 0.75mm to 0.90mm
c) 0.90mm to 1.05mm
d) 1.05mm to 1.25mm

Largest amount of material is used in ......
a) Buffing
b) Lapping
c) Honing
d) Superfinishing

The following is preferred for lapping soft ferrous and non-ferrous metals ......
a) Silicon carbide
b) Natural corundum
c) Aluminium oxide
d) All of these

The surface roughness on a drawing is represented by
a) Circle
b) Square
c) Triangle
d) Zig-Zag lines

Encoder is used in CNC machine tool, to sense and control ........
a) Spindle speed
b) Spindle position
c) Table position
d) All of these

The process of decomposing martensitic sfructure, by heating martensitic steel below its critical temperature is called as .....
a) Normalizing
b) Quenching
c) Tempering
d) Carburizing

Which of the following factors increases hardenability of a metal?
a) Alloying elements
b) Fine grain size
c) Very high carbon content in steel
d) All of these

Which carburizing method has high production rate?
a) Pack carburizing  
b) Liquid carburizing
c) Gas carburizing
d) All of these

Process control is carried out ......
a) Before production  
b) During production
c) After production control
d) All of these

Low cost, higher volume items requires .......
a) No inspection
b) Little inspection  
c) Intensive inspection
d) 100% inspection

Pre condition for deciding zero offset is .......
a) Cutter must be fixed jn machine spindle
b) Data must be entered in machine
c) Work must be clamped on the machine table
d) Feed, Speed etc. must be decided

The following type of lathe is operated through cams and cam plate ......
a) Precision lathe
b) Crankshaft lathe
c) Automatic lathe
d) Duplicating lathe

The following part of lathe serves as housing for the driving pulleys and back gears —
a) Head stock
b) Tail stock
c) Bed
d) Carriage

The following acts as driving shaft in lathe .....
a) Countershaft
b) Spindle shaft
c) Lead screw
d) None of these

The following is used for holding bored parts for machining their outside surfaces on lathe .......
a) Mandrel
b) Dogs
c) Driving plate
d) Angle plate

The following is used to turn very long job between centers on a lathe ........
a) Steady rest
b) Follower rest
c) Compound rest
d) All of these

The following is used to support to flexible job very close to the cutting edge .......
a) Steady rest  
b) Follower rest
c) Compound rest
d) All of these

G78 represents  ......
a) Rough turning
b) Thread cutting
c) Rough facing
d) Finishing cycle

CAD and CAM are related through  .......
a) NC tapes
b) Automation tools
c) Part production & testing
d) Common data base

In CNC machines, the controlling of function like speed, feed, tool positioning etc. are  controlled by .........
a) Numeric codes
b) Alpha codes
c) Alpha numeric codes
d) Photo sensing system

Which one of the following is not advantage of CNC machines .......
a) One machine can perform severai operation
b) Inspection cost is very loss
c) Difficult to correct the dimension variation
d) Functioning of machine not dependent on operational skills

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