1
For casting of turbine blades made of high temp and high strength alloys, the most suitable process is
2
A steel plate $$40cm \times 30cm \times 0.3cm$$ is to be cast. The volume shrinkage of steel during solidification is $$3\% .$$ A cylindrical side riser with diameter $$4cm$$ and height $$4cm$$ is used. The riser volume should at least be $$3$$ times that the dictated by shrinkage consideration. Is the riser volume sufficient if not what is the riser size?
3
When there is no room temp change, the total shrinkage allowance on a pattern is INDEPENDENCE OF
4
The problem of shrinkage cavity is more likely to occur while casting ......... A ............ B.......... a chill block
(A.) metal / plastic , (B.) with / without.
5
In $$TIG$$ welding a ...........A. .......... and ..........B.......... electrode is used.
A. non-consumable / consumable
B. coated / bare
6
The mode of metal transfer in $$C{O_2}$$-$$MIG$$ welding at low temperature is
7
8
With increasing joint thickness, the tensile strength of a brazed joint
9
A single point cutting tool with $${12^0}$$ rake angle is used for orthogonal machining of a ductile material. The shear plane angle for the theoretically minimum possible shear strain to occur
10
$$A\,\,2{1 \over 2}\,\,$$ control in a typical $$CNC$$ machine provides
11
The most common interpolation methods in continuous path $$NC$$ machining are
12
Use of a robot for spray painting is primarily justified for improved.... ....... .... A ...... and reduced......... B....................
A. productivity / consistency
B. cost / hazard
13
The base of a brass bracket has to be rough ground to remove the unevenness. The $$4$$ wheels available in the store. The appropriate wheel is
14
A milling cutter having $$8$$ teeth is rotating at $$100$$ $$rpm.$$ The work piece feed is set at $$40mm/min$$. The feed per tooth is
15
The diameter and rotational speed of a job are $$100mm$$ and $$500$$ $$rpm$$ respectively. The high spots (chatter marks) are found at a spacing of $$30$$ $$deg$$ on the job surface. The chatter frequency is
16
For cutting double start screw threads of pitch $$2.0$$ $$mm$$ on a lathe, the thread cutting tool should have a feed rate of
17
Reamer is designed to have even number of flutes to:
18
The following data apply to machining a part on turret lathe and a general purpose lathe
The setup cost and the cost for special tooling on the turret lathe would be $$Rs.3000/-.$$ These costs are negligible on the general purpose lathe. Calculate the batch seize which justifies the use of turret lathe.
19
A parting tool has a ground front clearance angle of $${6^0}$$ and the back rake angle of $${10^0}$$. The tool, by mistake, was set $$1.5$$ $$mm$$ above the line of centers while machining a job of $$50$$ $$mm$$ out-side diameter.
The diameter of the job at which, while parting, the tool will start rubbing
20
A parting tool has a ground front clearance angle of $${6^0}$$ and the back rake angle of $${10^0}$$. The tool, by mistake, was set $$1.5$$ $$mm$$ above the line of centers while machining a job of $$50$$ $$mm$$ out-side diameter.
The effective rake and clearance angle are
21
In comparison to $$HSS$$, super $$HSS$$ contains higher percentage of
22
$$BUE$$ formation ......A... the cutting force and ......B...... the surface finish
(a) decreases/ increases
(b) spoils / improves
23
Calculate the smallest punch diameter that can be designed for piercing sheet metal strip with the following data. Crushing strength of the punch material is $$1500$$ $$MPa.$$ Thickness of the sheet is $$2$$ $$mm,$$ factor of safety is $$3,$$ and shear strength of the sheet material $$500$$ $$MPa$$ is
24
A steel wire of length $$100$$ $$m$$ and diameter $$12.214$$ $$mm$$ is drawn to a final diameter of $$10mm.$$ Tensile tests of specimen made before and after the drawing operation gave yield stress as $$200$$ $$MPa$$ and $$400$$ $$MPa$$ respectively,
The yield stress of the steel at a true stain $$0.2,$$ by assuming linear strain hardening law.
25
A steel wire of length $$100$$ $$m$$ and diameter $$12.214$$ $$mm$$ is drawn to a final diameter of $$10mm.$$ Tensile tests of specimen made before and after the drawing operation gave yield stress as $$200$$ $$MPa$$ and $$400$$ $$MPa$$ respectively,
The length of drawn wire is
26
While rolling a strip the peripheral velocity of the roll is ..... A .... than the entry velocity of the strip and is ...... B .... the exit velocity of the strip
A. greater / less / equal to
B. greater than / less than / equal to
A. greater / less / equal to
B. greater than / less than / equal to
27
Semi brittle materials can be extruded by
28
Assertion (A): Basic hole system is advocated by Indian Standards for fit design
Explanation (E): Holes can be produced to any size.
Explanation (E): Holes can be produced to any size.
1
GATE PI 1990
Subjective
+6
-0
A steel plate $$40cm \times 30cm \times 0.3cm$$ is to be cast. The volume shrinkage of steel during solidification is $$3\% .$$ A cylindrical side riser with diameter $$4cm$$ and height $$4cm$$ is used. The riser volume should at least be $$3$$ times that the dictated by shrinkage consideration. Is the riser volume sufficient if not what is the riser size?
2
GATE PI 1990
MCQ (Single Correct Answer)
+2
-0.6
When there is no room temp change, the total shrinkage allowance on a pattern is INDEPENDENCE OF
3
GATE PI 1990
Fill in the Blanks
+1
-0
The problem of shrinkage cavity is more likely to occur while casting ......... A ............ B.......... a chill block
(A.) metal / plastic , (B.) with / without.
4
GATE PI 1990
Fill in the Blanks
+1
-0
In $$TIG$$ welding a ...........A. .......... and ..........B.......... electrode is used.
A. non-consumable / consumable
B. coated / bare
Subject
Casting
4
Joining of Materials
4
Machine Tools and Machining
14
Metal Forming
5
Metrology
1
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