Mechanical Questions

1. One micrometer (U) is equal to...

A. 0.1mm

B. 0.01mm

C. 0.001mm

D. 0.0001mm

2. The caliper meant for measuring the width of a slot is...

A. Odd leg caliper

B. Outside caliper

C. Jenny caliper

D. Inside caliper

3. For cutting thin tubing, the most suitable pitch of thehacksaw blade is...

A. 1.8mm

B. 1.4mm

C. 1mm

D. 0.8mm

4. For cutting solid brass, the most suitable pitch of thehacksaw blade is...

A. 1.8mm

B. 1.4mm

C. 1mm

D. 0.8mm

  .

 .

5. A new hacksaw blade after a few strokes becomes loosebecause of the...

A. Stretching of the blade

B. Wing-nut threads being worn out

C. Wrong pitch of the blade

D. Improper selection of the set of saws.

6. While cutting small diameter pipes, it is advisable towatch regularly and ensure that...

A. The cut is along the curved line

B. More saw teeth are in contract

C. The work is not overheated

D. Proper balancing of hacksaw is maintained

7. The vice clamps are used to...

A. Protect hard jaws

B. Clamp the work pieces rigidly

C. Protect the finished surfaces

D. Prevent the movable jaw being filed

8. The number of threads per inch can be checked with a

A. tool gauge

B. metric rule by counting

C. ring gauge

D. screw pitch gauge

9. The bottom surface joining the two sides of adjacent thread ( external thread ) is...

A. Flank

B. Root

C. Crest

D. Pitch

10.The dial test indicator shows the measurement as...

A. The actual size of the component

B. The difference between the two steps of 5 mm

C. The magnified small variations in sizes through a pointer

D. The direct reading of the dimension

2nd Semester Multiple Choice Questions

TRADE FITTER

2nd Semester Multiple Choice Questions

Exercise-01 Lathe Construction

1. Which one of the following is not a part of the centre lathe?

(a) Saddle                           (b) Feed rod

(c) Arbor                             (d) Lead screw

2. The headstock of a lathe is situated at the

(a) Right-hand end of the lathe bed       (b) Left-hand end of the lathe bed

(c) Middle of the lathe bed                      (d) Bottom of the lathe bed

3. The horizontal feed, cross feed and screw cutting movement in a lathe is

controlled by

(a) Headstock                       (b)Tailstock

(c) Cross-slide                      (d) Apron

4. A face plate is held at

(a) Headstock spindle         (b) Tailstock

(c) Tool post                      (d) Bed

5. Tumbler gear quadrant is used for

(a) Increasing the speed of the spindle

(b) Decreasing the speed of the spindle

(c) Changing the direction of rotation of the lead screw

(d) Changing the direction of the spindle

6. In a gap bed lathe, the gap is provided

(a) Just below the nose of the headstock spindle

(b) Just below the spindle of the tailstock

(c) In the middle of the bed        

(d) Anywhere in the bed

7. While drilling in lathe, the drill is held in the

(a) Headstock (b) Tailstock

(c) Compound rest (d) Bed

8. Back-gear mechanism is provided in cone pulley headstock to

(a) Reduce the speed of spindle

(b) Increase the speed of spindle

(c) Reverse the speed of spindle

(d) Transmit power from spindle gear to stud gear

9. Lathe bed is made of

(a) Mild steel                       (b) Cast iron

(c) High carbon steel              (d) High alloy steel

10.To prevent lathe bed guideways from damaging by chuck while mounting

(a) Take the help of the supervisor

(b) Support it with screw jack

(c) Lift it with hand crane

(d) Place a wooden piece on the guideways

11.The sliding surfaces of the lathe bed are

(a) Flame hardened              (b) Case hardened

(c) Normalised                      (d) Tempered

12.Which one of the following on a lathe is used to give depth of cut?

(a) Compound slide                (b) Top slide

(c) By adjusting the tool         (d) Cross slide

13.A tumbler gear unit consists of

(a) One gear                      (b) Two gears

(c) Three gears                   (d) Four gears

14.The lathe bed has

(a) One set of 'V guideways and flatways

(b) Two sets of 'V guideways and flatways

(c) Three sets of 'V guideways and flatways

(d) Four sets of 'V guideways and flatways

15.The cross-slide in a lathe moves

(a) Parallel to the axis of rotation                   (b) At any angle to the axis of rotation

(c)Perpendicular to the axis of rotation            (d) Either 'a' or 'b'

16.The carriage in a lathe moves

(a) Parallel to the axis of rotation

(b) At any angle to the axis of rotation

(c) Perpendicular to the axis of rotation

(d) Either 'a' or 'b'

17.Which among the following parts of a lathe should have high compressive

strength?

(a) Bed                             (b) Main spindle

(c) Lead screw                   (d) Sliding gears in headstock

18.The compound slide swivel base is set at 45° to the centre line of lathe. The

degree of the reading at the cross slide index will be

(a) 135°                          (b)90°

(c) 45°                                (d)30°

19.The special gear of 127 teeth or 63 teeth may be used to cut metric threads in a

lathe having British lead screw. It is known as

(a) Idler gear                              (b) Change gear

(c) Translating gear                (d) Compound gear

20.Which one of the following statements is true with respect to the half nut?

(a) It is detachable part of the saddle

(b) It is an integral part of the saddle

(c) It is an integral part of the apron

(d) It is detachable part of the apron

21.What is the function of the drop worm provided in the apron of the centre lathe?

(a) Engages / disengages the power feed

(b) Changes the direction of rotation of the workpiece

(c) Changes the feed direction

(d) Engages / disengages the lead screw

22.The tailstock barrel has an internal taper. Which one of the following standard

tapers is provided in the barrel bore?

(a) Metric taper         (b) Morse taper

(c) Jorno taper            (d) Brown and Sharpe taper

23.A jib is provided between the top slide and the swivel base assembly of the

compound slide. Its purpose is to

(a) Allowing dismantling the top slide easily

(b) Eliminate the backlash of the screw and the nut in the assembly

(c) Adjust the slackness developed due to wear

(d) Permit flow of the lubricant between the sliding surfaces

24.One of the parts of a centre lathe is tumbler gear unit. It is provided to

(a) Change the direction of feed

(b) Transmit motion from feed shaft to the carriage

(c) Change the direction of rotation of the work

(d) Alter the spindle speed

25.The graduations are marked at the base of the tailstock. To offset the body these

graduations are given in

(a) Degrees (b) Taper per foot

(c) mm (d) Radians

26.The capacity of a lathe is expressed as

(a) Horsepower and chuck diameter

(b) Swing and distance between centres

(c) Bed length and spindle speed

(d) Tool post size and lathe travel

27.The carriage of a lathe travels along which axis?

(a) "B" axis              (b) "Z" axis

(c) "Y" axis               (d)"X"axis

28.The basic turning lathe is

(a) Turret lathe                     (b) Automatic lathe

(c) Engine lathe                       (d) Swiss lathe

Key to Exercise - 01

1. c ,2.b, 3.d ,4.a, 5. C,6. a ,7.b ,8.a ,9.b, 10.d,11.a, 12.d ,13.c ,14.b ,15.c,16.a, 17.a,18.c, 19.c ,20.d,21.a ,22.c ,23.c ,24.a, 25.b,26.b, 27.b ,28.c

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Engineering Drawing Question Answers

1) Geometrical construction which are mostly based on plane geometry and
 which are very.......

a) Accuracy                       

b) Quality

c) Essential                        

d) Superior quality

2) How much method of drawing the regular polygons....... 

a) Inscribe circle method and arc method 

b) General method for drawing any polygon   

c) Alternative method

d) All of these

4) Which method of constructing triangl in circle......

a) Inscribing                         

b) Describing

c) Both a and b                    

d) None of these

5) When two sides of the hexagon are required to be horizontal the
 starting point for stepping equal division should be on an end of the.....

a) Horizontal diameter             

b) Vertical diameter

c) Inclined diameter                

d) None of these 

6) If two sides of hexagon are required to be vertical the 
starting point should be on an end of the....

a) Inclined diameter                

b) Horizontal diameter 

c) Vertical diameter                 

d) None of these

7) The section obtained by the inter section of the right

 circular cone by a plane in different position relative to 

the axis of the cone are called.......

a) Conics                           

b) Circles

c) Triangles                     

d) Half circle

8) When the section plane is inclined to the axis and cuts all the generators on one side on a apex the section is in......

a) Conic section                 

b) Ellipse

c) Parabola                         

d) Hyperbola

DC Machines:

DC Machine

a DC generator or a DC motor can be broadly termed as a DC machine. 

Construction Of A DC Machine

The above figure shows the constructional details of a simple 4-pole DC machine. A DC machine consists two basic parts; stator and rotor. Basic constructional parts of a DC machine are described below.

1. Yoke: The outer frame of a dc machine is called as yoke. It is made up of cast iron or steel. It not only provides mechanical strength to the whole assembly but also carries the magnetic flux produced by the field winding.
2. Poles and pole shoes: Poles are joined to the yoke with the help of bolts or welding. They carry field winding and pole shoes are fastened to them. Pole shoes serve two purposes; (i) they support field coils and (ii) spread out the flux in air gap uniformly.
3. Field winding: They are usually made of copper. Field coils are former wound and placed on each pole and are connected in series. They are wound in such a way that, when energized, they form alternate North and South poles.
4. Armature core: Armature core is the rotor of the machine. It is cylindrical in shape with slots to carry armature winding. The armature is built up of thin laminated circular steel disks for reducing eddy current losses. It may be provided with air ducts for the axial air flow for cooling purposes. Armature is keyed to the shaft.
   
5. Armature winding: It is usually a former wound copper coil which rests in armature slots. The armature conductors are insulated from each other and also from the armature core. Armature winding can be wound by one of the two methods; lap winding or wave winding. 
6. Commutator and brushes: Physical connection to the armature winding is made through a commutator-brush arrangement. The function of a commutator, in a dc generator, is to collect the current generated in armature conductors. Whereas, in case of a dc motor, commutator helps in providing current to the armature conductors. A commutator consists of a set of copper segments which are insulated from each other. The number of segments is equal to the number of armature coils. Each segment is connected to an armature coil and the commutator is keyed to the shaft. Brushes are usually made from carbon or graphite. 

Ohm’s Law

Statement of Ohm’s Law

Georg Simon Ohm 

The statement of Ohm’s law is simple, and it says that whenever a potential difference or voltage is applied across a resistor of a closed circuit, current starts flowing through it.This current is directly proportional to the voltage applied if temperature and all other factors remain constant. Thus we can mathematically express it as:

Now putting the constant of proportionality we get

This particular equation essentially presents the statement of this law where I is the current through the resistor, measured in Ampere (Ampere, or amps), when the electric potential difference V is applied across the resistor in unit of volt, and ohm(Ω) is the unit of measure for the resistance of the resistor R.

DRAWING ANGLES WITH SET SQUARES

                                                 DRAWING ANGLES WITH SET SQUARES

Set squares are used in conjunction with T-squares to draw accurate angles. There are two main types of set square. One has an angle of 45 degrees and the other 30/60 degree angles. The 45 degree set square also has a 90 degree angle.  This can be used for drawing vertical lines. The 30/60 degree set square also has a 90 degree angle.  This set square can be used to draw 30, 60 or 90 degrees angles.

ORTHOGRAPHIC DRAWING

INTRODUCTION TO THIRD ANGLE ORTHOGRAPHIC DRAWING

Orthographic drawing is a way of drawing a three dimensional object. Normally the object is drawn as three separate, related views - Front View, Side View and Plan View. 

The example below shows a simple shaped block, with a hole drilled all the way through. 

The front view, is a drawing of the block, as if you are looking directly at the front of the object.
The side view, is a drawing of the block, when it has been rotated so that one of its sides is now directly in view.
The plan view, is a ‘birds eye’ view, from above.

Dotted lines represent ‘hidden detail’. In this case they represent the hole, through the block/object

The front, side and plan views are arranged in the positions shown below. They must be drawn accurately. 

Draw the front view first, followed by the side view. The plan view is drawn directly above the front view. Note, a 45 degree line allows the projection of the side view to the plan view

Dimensions (measurements) are added to the completed views. Usually six dimensions are added. This enables anyone looking at the orthographic drawing, to work out the overall size of the object. More dimensions can be added if necessary. Dimensions are drawn on each of the views.

THE CENTRE LATHE

                                    THE CENTER LATHE

The Centre Lathe is used to manufacture cylindrical shapes from a range of materials including; steels and plastics. Many of the components that go together to make an engine work have been manufactured using lathes.. A basic manual centre lathe is shown below. This type of lathe is controlled by a person turning the various handles on the top slide and cross slide in order to make a product / part.

The headstock of a centre lathe can be opened, revealing an arrangement of gears. These gears are sometimes replaced to alter the speed of rotation of the chuck.The speed of rotation of the chuck is usually set by using the gear levers. These are usually on top of the headstock or along the front and allow for a wide range of speeds.

However, sometimes the only way to set the lathe to a particular speed is to change the gear arrangement inside the headstock.

NCVT ITI Semester Result 2016

NCVT ITI Semester Result 2016 

https://ncvtmis.gov.in/pages/marksheet/validate.aspx