Quiz 3 Manufacturing Engineering Gate , ies , Objective Quiz with Explanation
Quiz 3 Manufacturing Engineering GATE , IES , Objective Quiz with Explanation
This quiz no .3 about objective questions related manufacturing engineering which frequently asked GATE ,IES ,INTERVIEWS and viva orals. In this quiz we have provided all solutions / answers explanation which helpful to you get rid of Confusion about wrong answer . i Hopes this quiz will help you to clear doubts about Manufacturing related questions
1. In a rolling process, the state of stress of the material undergoing deformation is
Option (A) is correct. Most metal rolling operations are similar in that the work material is plastically deformed by compressive forces between two constantly spinning rolls. Thus in a Rolling process, the material undergoing deformation is in the state of pure biaxial compression.
2. For a ductile material, toughness is a measure of
Option (B) is correct. For ductile material, toughness is a measure of ability to absorb energy of impact loading up to fracture.
3. The operation in which oil is permeated into the pores of a powder metallurgy product is known as
Option (C) is correct. If the pores in a sintered compact are filled with an oil, the operation is called as impregnation. The lubricants are added to the porous bearings, gears and pump rotors etc.
4. Which one among the following welding processes uses non-consumable electrode ?
Option (C) is correct. GTAW is also called as Tungsten Inert Gas Welding (TIG). The arc is maintained between the work piece and a tungsten electrode by an inert gas. The electrode is non-consumable since its melting point is about 3400cC.
5. The crystal structure of austenite is
Option (B) is correct. Austenite is a solid solution of carbon in g -iron. It has F.C.C structure. It has a solid solubility of upto 2% C at 1130cC
6. In a CNC program block, N002 GO2 G91 X40 Z40......,GO2 and G91 refer to
Option (C) is correct. GO2 represent circular interpolation in clockwise direction. G91 represent incremental dimension.
7. Friction at the tool-chip interface can be reduced by
Option (D) is correct. The cutting forces decrease with an increase in cutting speed, but it is substantially smaller than the increase in speed. With the increase in speed, friction decreases at the tool chip interface. The thickness of chip reduces by increasing the speed.
8. Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as
Option (A) is correct. Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as cold shut. This defect is same as in sand mould casting.The reasons are :- (i) Cooling of die or loss of plasticity of the metal. (ii) Shot speed less. (iii) Air-vent or overflow is closed.
9. Internal gear cutting operation can be performed by
Option (C) is correct. Internal gear cutting operation can be performed by shaping with pinion cutter. In the case of ‘rotating pinion type cutter’, such an indexing is not required, therefore, this type is more productive and so common.
10 . While cooling, a cubical casting of side 40 mm undergoes 3%, 4% and 5% volume shrinkage during the liquid state, phase transition and solid state, respectively. The volume of metal compensated from the riser is
Option (B) is correct. Since metal shrinks on solidification and contracts further on cooling to room temperature, linear dimensions of patterns are increased in respect of those of the finished casting to be obtained. This is called the “Shrinkage allowance”. The riser can compensate for volume shrinkage only in the liquid or transition stage and not in the solid state.So, Volume of metal that compensated from the riser = 3%+ 4% = 7%
11. If a particular Fe-C alloy contains less than 0.83% carbon, it is called
Option (B) is correct. The carbon alloy having less than 2% carbon are called “steels” and those containing over 2% carbon are called cast irons.Now, steel may further be classified into two groups. (i) Steels having less than 0.83% carbon are called “hypo-eutectoid steels” (ii) Those having more than 0.83% carbon called “hyper-eutectoid steels”
12. Which one of the following is a solid state joining process ?
Option (C) is correct. Friction welding is defined as “ A solid state welding process wherein coalescence is produced by heat obtained from mechanically induced sliding motion between rubbing surfaces.
13. Which type of motor is NOT used in axis or spindle drives of CNC machine tools ?
Option (C) is correct. A spindle motor is a small, high precision, high reliability electric motor that is used to rotate the shaft or spindle used in machine tools for performing a wide rang of tasks like drilling, grinding, milling etc. A stepper motor have not all these characteristic due to change of direction of rotation with time interval.
14. A ring gauge is used to measure
Option (A) is correct. Ring gauges are used for gauging the shaft and male components i.e. measure the outside diameter. It does not able to measure the roundness of the given shaft.
15. An expendable pattern is used in
Option (D) is correct. Investment casting uses an expandable pattern, which is made of wax or of a plastic by molding or rapid prototyping techniques. This pattern is made by injecting molten wax or plastic into a metal die in the shape of the pattern.
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