The cutting speed for drilling aluminium, brass and bronze with high speed steel drills varies from
10 to 20 m/min
18 to 30 m/min
24 to 45 m/min
60 to 90 m/min
Correct Answer :
D. 60 to 90 m/min
Related Questions
The top and sides of the table of a shaper usually have
L-type slots
T-type slots
I-type slots
Any one of these
Thread grinding requires work speed from
1 to 3 m/min
5 to 10 m/min
10 to 14 m/min
14 to 20 m/min
The lathe centres are provided with standard taper known as
Morse taper
Seller's taper
Chapman taper
Brown and Sharpe taper
Which of the following statement is correct in regard to centreless grinding?
The workpiece is supported throughout its entire length as grinding takes place.
It is a continuous process and adopted for production work.
It requires no holding device for the work.
All of the above
In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
Depth of cut
Cutting speed
Feed
Tool rake angle
The soft grade grinding wheels are denoted by the letters
A to H
I to P
Q to Z
A to P
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.
2.17 rpm, 600 joules
6.8 rpm, 6 joules
5.03 rpm, 600 joules
22 rpm, 600 joules
The capacity of a material to be welded under the imposed fabrication conditions into a specific, suitably designed structure and to perform satisfactorily in the intended service is known as?
Weldment
Weld tab
Weldability
Tack weld
Which of the following arc welding processes does not use consumable electrodes?
GMAW
GTAW
Submerged Arc Welding
None of these
The primary purpose of a sprue in a casting mould is to
Feed the casting at a rate consistent with the rate of solidification.
Act as a reservoir for molten metal
Feed molten metal from the pouring basin to the gate
Help feed the casting until all solidification takes place
A bottoming tap has
Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of the above
In order to have interference fit, it is essential that the lower limit of the shaft should be
Greater than the upper limit of the hole
Lesser than the upper limit of the hole
Greater than the lower limit of the hole
Lesser than the lower limit of the hole
A mandrel is used to hold
An eccentric work
A heavy work
A thin work
None of these
Gear lapping is an operation
After heat treatment
Prior to heat treatment
For gear reconditioning
None of these
The relief or clearance at the cutting edge of a flat drill varies from
3° to 8°
20° to 30°
60° to 90°
90° to 120°
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
Globular transfer
Spray transfer
GMAW practice
Dip transfer
Match the following metal forming processes with their associated stresses in the work piece.
| Metal forming process | Types of stress |
|---|---|
| 1. Coining | P. Tensile |
| 2. Wire Drawing | Q. Shear |
| 3. Blanking | R. Tensile and compressive |
| 4. Deep Drawing | S. Compressive |
1-S, 2-P, 3-Q, 4-R
1-S, 2-P, 3-R, 4-Q
1-P, 2-Q, 3-S, 4-R
1-P, 2-R, 3-Q, 4-S
Trepanning is performed for
Finishing a drilled hole
Producing a large hole without drilling
Truing a hole for alignment
Enlarging a drilled hole
Relief angles on high speed steel tools usually vary from
0° to 3°
3° to 10°
10° to 20°
20° to 30°
The percentage of carbon in gray cast iron is in the range of
0.25 to 0.75 percent
1.25 to 1.75 percent
3 to 4 percent
8 to 10 percent
Which of the following operation is first performed?
Spot facing
Boring
Tapping
Drilling
A diamond locating pin is used in jigs and fixtures because
Diamond is very hard and wear resistant
It occupies very little space
It helps in assembly with tolerance on centre distance
It has a long life
In up milling, the thickness of chip is
Minimum at the beginning of the cut and maximum at the end of the cut
Maximum at the beginning of the cut and minimum at the end of the cut
Uniform throughout the cut
None of these
The usual value of the point angle of a drill is
70°
100°
118°
130°
The main purpose of a boring operation, as compared to drilling, is to
Drill a hole
Finish the drilled hole
Correct the hole
Enlarge the existing hole
In a milling operation, two side milling cutters are mounted with a desired distance between them so that both sides of a workpiece can be milled simultaneously. This set up is called
Gang milling
Straddle milling
String milling
Side milling
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
Increases continuously
Decreases continuously
Decreases, becomes stable and then increases.
Increases, becomes stable and then decreases.
The work or surface speed for cylindrical grinding varies from
5 to 10 m/min
10 to 20 m/min
20 to 30 m/min
40 to 60 m/min
In a shaper
Tool is stationary and work reciprocates
Work is stationary and tool reciprocates
Tool moves over stationary work
Tool moves over reciprocating work
The guideways are of
Flat type
V-type
Dovetail type
Any one of these