TURNER THEORY SEM 2 JAN2018

TURNER THEORY SEM 2
 JAN2018

1. The flux commonly used in brazing is.........
a) Zinc chloride
b) Ammonium chloride
c) Rasin plus alcohol
d) Borax

For turning small taper on long work piece, the suitable method is .......
a) By a form tool
b) By setting over the tail stock
c) By a taper turning attachment
d) By a swiveling the compound rest

For turning internal tapers, the suitable method is .........
a) By a form tool
b) By setting over the tail stock
c) By a taper turning attachment
d) By a swiveling the compound rest

Slow speed of the spindle is necessary in........
a) Thread cutting
b) Turning a hard or tough material
c) Turning a work of large diameter
d) All of the above

The following is taper turning method on lathe .......
a) Tail tock set over method
b) By swiveling the compound rest
c) Using a broad nose tool
d) All of these

The axial advancement in one rotation of screw part is known as of the threads.
a) Pitch
b) Lead
c) Pitch diameter
d) Helix angle

In cutting right hand threads, the spindle and lead screw rotates in the ....
a) Same direction
b) Opposite direction
c) Both (a) & (b)
d) Spindle rotates but. lead screw does not rotate

The tail stock set over method of taper turning is preferred for ....
a) Internal tapers
b) Small tapers
c) Long slender tapers
d) Steep tapers

The tail stock set over required to turn a taper on the entire length of a work piece having diameters D and d is .......
a) D-d/2L
b) D-d/L
c) D-d/2
d) D-d

The taper on lathe spindles is .....
a) 1 in 10 b) 1 in 15
c) 1 in 20 d) 1 in 30

The lathe spindles at the nose end have .......
a) Internal screw threads
b) External screw threads
c) No threads
d) Tapered threads

The lathe spindles are usually made hollow and provided with .........
a) Internal taper
b) External taper
c) Internal and External taper
d) No taper

The lathe centres are provided with standard taper known as-
a) Morse
b) Seller's taper
c) Chapman taper
d) Brown and sharp taper

The brazing metals and alloys commonly used are ........
a) Copper
b) Silver alloys
c) Aluminium alloys
d) All of these

Solder is essentially a ...
a) Tin-silve base
b) Tin-lead base
c) Silver-lead base
d) Tin-bismuth base

A soldering Iron "bit" is made of ......
a) Brass
b) Tin
c) Steel
d) Copper

The purpose of using flux in soldering ........
a) Prevent oxides forming
b) Fill up gaps left in a bad joint
c) Increase fluidity of solder metal
d) Lower the melting temperature of the solder

Brazing is the process of .......
a) Casing in brass
b) Making steel look like brass
c) Joining plastic sheets
d) Hard soldering using brass spelter

Welding process in which two pieces to be joined are overlapped and placed between two  electrodes is kiown as .....
a) Spot welding
b) Seam welding
c) Projection welding
d) Butt welding

The Purpose of chasing dial on lathe is to achieve .......
a) Picking up the thread accurately at beginning of each cut
b) Taper turning
c) Cutting of tapered threads
d) Cutting of multiple

An important precaution to produce a good soldered joint is that .....
a) The joint area must be clean and close-fitting
b) Aluminum wire must be placed along the joint
c) The soldering iron bit must first be made red hot
d) Flux should be applied both before and after soldering

Post cleaning is necessary at brazed joint in order to avoid .....
a) Corrosion
b) Slagging
c) Oxidation
d) Wak joint

Which of the following taper turning method can be used only for turning external taper?
a) Form tool
b) Tailstock offset
c) Taper attachment
d) Compound rest

If a 25° taper is to be cut with small diameter toward the tailstock the setting of taper  turning attachment would be-
a) +25°  b) -25° c) +12.5° d) -12.5°

The soldering process is carried in the temperature range of .....
a) 40°C to 100°C
b) 180°C to 250°C
c) 300°C to 500°C
d) 600°C to 900°C

Short and sharp angle tapers are machined using .......
a) A taper attachment
b) The compound rest
c) Morse taper attachment
d) The tailstock set over method

In brazing the melting point of filler metal is ........
a) Below 420°C
b) Above 420°C
c) Below 520°C
d) Above 520°C

During taper turning by offsetting tailstock method the part of tail stock offsetted is .....
a) Body  
b) Spindles
c) Base  
d) Whole unit

Seam welding is a...
a) Continuous spot welding process
b) Multi-spot welding process
c) Arc welding process
d) Process used for joining two round bars

The welding process used to join two ends of two pipes of uniform cross section is ......
a) Spot welding
b) Seam welding
c) Projection welding
d) Upset butt welding

In arc welding, the electric arc is produced between the work and the electrode by ......
a) Voltage
b) Flow of current
c) Contact resistance
d) All of these

The consumable electrode is used in ......
a) Carbon arc welding
b) Submerged arc welding
c) TIG arc welding
d) MIG arc welding

The lathe spindle at the nose end has ....
a) Internal threads
b) External threads
c) Taper threads
d) Snap threads

Combination set consists of scale ...
a) Center Head
b) Protractor Head
c) Square Head
d) All of these

The largest diameter of an external or internal screw thread is known as .....
a) Minor diameter
b) Major diameter
c) Pitch diameter
d) None of these

Which of the following statement is correct?
a) The distance from a peiut on the thread to the corresponding point of the next thread is called pitch
b) The distance which a screw thread advance axially in one rotation of the nut is called lead
c) In single start threads, lead is equal to pitch
d) All of these

The included angle for British Association thread is .....
a) 29°  b) 47.5°  c) 55°  d) 60°

When screw threads are to be used in a situation where power is being transmitted in one  direction only, then the screw threads suitable for this will be ....
a) Square threads
b) Acme threads
c) Knuckle threads
d) Buttress threads

Which thread are not so strong as V-threads, they offer less frictional resistance to motion  than whitworth threads .....
a) Square threads
b) Acme threads
c) Knuckle threads
d) Buttress threads

The included angle for metric thread is ....
a) 29°  b) 47.5°  c) 60°  d) 55°

The top surface of the thread is called .......
a) Lead
b) Turn
c) Crest
d) Root

In a centre lathe, the cutting tool is fed in with reference to the lathe axis.
a) Cross direction only
b) Lonytudinal direction only
c) Both Cross and longitudinal direction
d) Any direction

Which of the following is not provided on combination set?
a) Vernier scale
b) Centre head
c) Protec,tcr head
d) Squaring head

For tight leakage joints, following type of thread i.s best suited ....
a) Metric
b) Square
c) Acme
d) National pipe thread

It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 rpm. Then the speed of lead screw will be ....
a) 10 rpm b) 20 rpm
c) 120 rpm d) 180 rpm

While cutting helical gears on a non-differential gear hobber, the feed change gear raiio is ....
a) Independent of index change gear ratio
b) Dependent of speed change gear ratio
c) Inter-related of index change gear ratio
d) Independent of speed and index change gear ratio

Internal or external threads of different pitches can be produced by
a) Pantograph milling machine
b) Profiling milling machine
c) Plano miller
d) Planetary milling machine

Standard taper generally used on milling machine spindles is .....
a) Morse
b) Brown and sharpe
c) Chapman
d) Seller's

The taper of internal dovetail can 'be measured with the help of ....
a) Sine bar
b) Combination set
c) Balls of standard dimension and slip gauges
d) Dial guage

External taper can be accurately measured with the help of .....
a) Sine bat and slip guages
b) Dividing head
c) Precision balls and height guage
d) Combination set



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