17/B/C/S-2/4/E

PAPER-I
TURNER
(THEORY)
SEMESTER - II

The slowest speed in lathe is adopted for following operation -

a. Normal turning    b Thread cutting

c. Taper turning d Knurling

The composion of soft solder is -

a.Lead-37%,tin63% b. Lead-67%, tin 37%

c. Lead-70%, tin 30% d- tead 50%.. tin 50%

The welding process used in joining mild steel shanks to high speed drill is -
a. Spot welding    b Seam welding

c. Flash butt welding     d Upset butt welding

for arc welding -

a. Direct current is used

b. Alternating current with high frequency is used

c. Alternating current with low frequency is used

d. None of these

Which of the following welding process uses non-consumable electrodes?

a. Manual arc welding b- Submerged arc welding

c.TIG welding d.Mig welding

The oxy-acetylene gas used in gas welding produce a flame temperature of
a. 1800°C b. 2100.°C

c.2400°C d.3200°C

The purpose of using borax in brazing is -

a. Dissolve oxides when heating the work

b. Prevent the spelter from melting too quickly

c. Increase fluidity "of braze material

d. Accelerate the formation of oxides on the work

When brazing is carried out --

a. A joint is made between two parts by molten spelter

b. The edges of the joint melt and run together

c. Spelter forms an alloy with flux

d. Flux acts as a connecting material

soldering process is supplied by...........
a Soldering iron
b Electric resistance welding

c  Induction furnace
d. None of these

The brazing process is carried in the temperature range of-

a. 150°Cto250cC       b. 250°C to 450°C

c. 500°C to 700°C     d. 7Q0X to 900UC

In soldering the melting point of filler metal is -
a. Below 420°C b. Above 420«c

c. Below 520°C d. Above 520^C

The rate of feed depends upon -

a. Finish required b. Material of drill

c. Material to be drilled ± All of these

For a 5° taper over 5 mm length is to be made on a 100 mm diameter which job. Method
should be used ?

a. Taper turning attachment b. Tailstock offset method

c. Compound rest method d. Form tool method

The smallest diameter of an external or internal screw thread is known as -
a. Minor diameter b. Major diameter

c. Pitch diameter d. None of these

The included angle for Acme thread is —

a- 29o b. 47.5*

c-55° d. 60°

Which thread have low friction resistance chracteristic of the square thread and have the same

strength of V-threads?

a. Square threads b. Acme threads

c. Knuckle threads A Buttress threads

The included angle for British standard whitworth thread is -

a- 29° b. 47.5"

c- 55° d. 60"

The bottom surface created by the two adjacent flanks of the thread is called -
a. Lead b. Turn

c. Crest d. Root

The distance from a point on the thread to the corresponding point of the next thread is called-
a. Lead b. Pitch

c.Turn d. Crest

Combination set can be used —

a. Check angular surface b. Scribe lines

c. Draw circle and arcs d. Draw circle and arcs

The crest diameter of screw thread is same as —

a. Major diameter b. Minor diameter

c. Core diameter d. Pitch diameter

For application involving high stresses in one direction only the following type of thread would
be best suited —

a. Metric thread b. Square thread

c. Acme thread d. Buttress thread

If threads on a bolt are left hand, threads on nut will be -

a. Right hand with same pitch . b. Left hand with same pitch

c. Right hand with fine pitch d. Left hand with fine pitch

A bench vice has which type of threads?

a. Metric b. Square

c. Acme d. British associate

Silver-based solder is used for — .

a. Flaring b. Brazing

c. Soft soldering d. Fusion welding

. The distance which a screw thread advance axiaiiy in one rotation of the nut is called -
a. Lead b. Pitch

c. Turn d. Crest

The lead screw of a lathe has...........threads.

a. Single start b. Double start

c. Multi start d. All of these

Screw thread may be cut on a 10 mm dia. Steel rod by using -

a. A circular split die b. A set of Taps

c. Adrill and a reamer d. As knurling tool

The lathe centres are provided with standard taper known as -

a. Morse taper b. Seller's taper

c. Chapman taperq d. Brown and sharpe taper

Calculate diameter of best wire for a withworth thread or M24 X 7 mm size -
a. 4.04 mm b. 7.8 mm

c.-3.94mm d. 8.08 mm

Calculate lead angle of a thread which has mean diameter of 45 mm and lead of 10 mm
a: 8.5 0 b. 4.04 c

c. 3.02° d. 4.02°

External screw threads can be produced fastest by -

a. Milling b. Chasing

c. Casting d. Rolling

Internal and external tapers on a turret lathe can be turned by -

a. Face turning attachment b. Taper turning attachment

c. Moarse taper attachment d. Sliding attachment

Brown and sharp taper is generally used in —

a. Lathe machine b. Milling machine

c. Shaper machine. d. Broching machine

Half nut is connected with—

a. Lockong device

b. JIG and Fixtures

c. Thread cutting on lathe

d. Quick engaging and disengaging device

In which type of welding a-pool molten metal is used?

a. Submerged arc b. MIG

c. TIG d. Thermit welding

Which of the following screw thread is adopted for power transmission in either direction?
a. Acme threads b. Square threads

c. Buttress threads d. Multiple threads

& Fixtures are used for —

a. Mass production f      b. Identical parts production

c. Both (a) & (b) d. None of these

The included angle of taper in collet is usually —

a. 1-2° b. 5-10°

c. 30° d. 45°

A slight taper on the full length of a long shaft mounted between centres on a universal
cylindrical grinder can be ground by -

a. Off setting the tail stock b. Swiveling the table on its base

c. Swiveling the wheel head d. Taper turning attachment

The flux commonly used in brazing is -

a. Zinc chloride b. Ammonium chloride

c. Rosin plus alchol d. Borax

For turning small taper-on long work piece 5 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

Which one of t he following is used for taper turning method on lathe?

a. Tail stock set over method b. By swivelling the compound rest

c. Using a broad nose tool     . d. All of these

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 threads

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

A desired speed of__can be obtained by selecting the suitable change gears having

proper number of teeth.

a. Lead screw     [ b. Countershaft

c. Spindle d. Feed gear box

Assume a machining process of taper turning. In this process, a large diameter of taper is 'D'
and it is uniformly decreased to the' small diameter of the taper'd' at the horizontal length of
Tapered part of workpiece is 'L'. What is the correct formula for half of tapper angle (2a / 2)?
a. a = sin"1 ((D-d)/ 2L) b. a = cos"1 ((D-d)/ 2L)

a a = tan"1 ((D-d)/ 2L) d. a - cot"1 ((D - d) / 2L)

What is swing over carriage?

a. The maximum diameter of workpiece that can be rotated over the bed ways

b. The minimum diameter of workpiece that can be rotated over the bed ways

c. The maximum diameter of workpiece that can be rotated over lathe saddle

d. The minimum diameter of workpiece that can be rotated over lathe saddle

An alloy is a -

a. Fuse metal ^    b. Mixture of metals in any proportion

c. Mixture of metals in fixed proportion . d. Mixture of two non-metals