Machining · Production Engineering · GATE ME
Marks 1
1
Metric thread of $$0.8$$ $$mm$$ pitch is to be cut on a lathe. Pitch of the lead screw is $$1.5$$ $$mm.$$ If the spindle rotates at $$1500$$ $$rpm,$$ the speed of rotation of the lead screw $$(rpm)$$ will be _____________
GATE ME 2017 Set 1
2
Internal gears are manufactured by
GATE ME 2016 Set 3
3
The following data is applicable for a turning operation. The length of job is $$900$$ $$mm,$$ diameter of job is $$200$$ $$mm,$$ feed rate is $$0.25$$ $$mm/rev$$ and optimum cutting speed is $$300$$ $$m/min.$$ The machining time (in $$min$$) is _____________
GATE ME 2016 Set 2
4
In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is
GATE ME 2015 Set 3
5
Two separate slab milling operations, $$1$$ and $$2,$$ are performed with identical milling cutters. The depth of cut in operation $$2$$ is twice that in operation $$1.$$ The other cutting parameters are identical. The ratio of maximum uncut chip thicknesses in operations $$1$$ and $$2$$ is ___________
GATE ME 2014 Set 4
6
Match the Machine Tools (Group A) with the probable Operations (Group B)
GATE ME 2014 Set 2
7
A steel bar $$200$$ $$mm$$ in diameter is turned at a feed of $$0.25$$ $$mm/rev$$ with a depth of cut of $$4$$ $$mm.$$ The rotational speed of the work piece is $$160$$ $$rpm.$$ The material removal rate in $$m{m^3}/s$$ is
GATE ME 2013
8
Internal gear cutting operation can be performed by
GATE ME 2008
9
Quality screw threads are produced by
GATE ME 2003
10
A good cutting fluid should have
GATE ME 2003
11
The hardness of a grinding wheel is determined by the
GATE ME 2002
12
Trepanning is performed for
GATE ME 2002
13
A lead screw with half nuts in a lathe, free to rotate in both directions has
GATE ME 2002
14
Allowance in limits and fits refers to
GATE ME 2001
15
Abrasive material used in grinding wheel selected for grinding ferrous alloys is
GATE ME 2000
16
Deep hole drilling of small diameter, say $$0.2$$ $$mm$$ is done with $$EDM$$ by selecting the tool material as
GATE ME 2000
17
Helix angle of fast helix drill is normally
GATE ME 1997
18
The rake angle in drill
GATE ME 1996
19
The rake angle in drill
GATE ME 1996
20
Among the conventional machining processes, maximum specific energy is consumed in
GATE ME 1995
21
Plain milling of mild steel plates produces
GATE ME 1995
22
Diamond wheels should not be used for grinding steel components
GATE ME 1995
23
To get good surface finish on a turned job, one should use a sharp tool with a ......... Feed rate and ............... Speed of rotation of the job.
GATE ME 1994
24
In horizontal milling process ............................ (up/down) milling provides better surface finish and .............................. Up/down ) milling provide longer tool life.
GATE ME 1992
25
If the longitudinal feed in center-less grinding is expressed by
$${V_f} = \pi \,D.\,\,N\,\sin \,\alpha ,\,\,D$$ stands for
$${V_f} = \pi \,D.\,\,N\,\sin \,\alpha ,\,\,D$$ stands for
GATE ME 1990
26
In small lot production for machining $$T-$$slots on machine tables, it is expected to use
GATE ME 1990
27
When $$1.0\% $$ plain carbon steel is slowly cooled from the molten state to $$740C,$$ the resulting structure will contain
GATE ME 1990
28
Gear hobbing produces more accurate gears than milling because in hobbing
GATE ME 1989
29
Minimum dimensional and form accuracy can be obtained in the cylinder bores of automobile engines if the bores are finished by
GATE ME 1989
30
Teeth of internal spur gears can be accurately cut in a
GATE ME 1989
31
Cutting speed in grinding is set to a high value to
GATE ME 1988
32
The standard specification of a grinding wheel is $$A-46-M-6-V-21.$$ It means a wheel of
GATE ME 1988
33
In twist drills ......... (small/large) point angle and ........ (small/large) helix angle are provided for drilling soft, low strength steel.
GATE ME 1988
Marks 2
1
Cylindrical workpieces of diameter 60 mm and length 400 mm are machined on a lathe at a cutting speed of $25 \mathrm{~m} \mathrm{~min}^{-1}$ and a feed of $0.2 \mathrm{~mm} \mathrm{rev}^{-1}$. The Taylor's tool life parameters $C$ and $n$ for this setup are 75 and 0.25 , respectively. The tool changing time is 3 minutes. With a labor and overhead cost of Rs. 5 per minute, the tool changing cost per piece is Rs. ___________ (rounded off to 2 decimal places).
GATE ME 2025
2
A flat surface of a C60 steel having dimensions of 100 mm (length) × 200 mm (width) is produced by a HSS slab mill cutter. The 8-toothed cutter has 100 mm diameter and 200 mm width. The feed per tooth is 0.1 mm, cutting velocity is 20 m/min and depth of cut is 2 mm. The machining time required to remove the entire stock is ____________ minutes (rounded off to 2 decimal places).
GATE ME 2024
3
A block of length $$200$$ $$mm$$ is machined by a slab milling cutter $$34$$ $$mm$$ in diameter. The depth of cut and table feed are set at $$2$$ $$mm$$ and $$18$$ $$mm/minute,$$ respectively. Considering the approach and the over travel of the cutter to be same, the minimum estimated machining time per pass is _____________ minutes.
GATE ME 2017 Set 1
4
A shaft of length $$90$$ $$mm$$ has a tapered portion of length $$55$$ $$mm.$$ The diameter of the taper is $$80$$ $$mm$$ at one end and $$65$$ $$mm$$ at the other. If the taper is made by tailstock set over method, the taper angle
and the set over respectively are.
GATE ME 2015 Set 3
5
A hole of $$20$$ $$mm$$ diameter is to be drilled in a steel block of $$40$$ $$mm$$ thickness. The drilling is performed at rotational speed of $$400$$ $$rpm$$ and feed rate of $$0.1$$ $$mm/rev.$$ The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is
GATE ME 2014 Set 2
6
In a single pass drilling operation, a through hole of $$15$$ $$mm$$ diameter is to be drilled in a steel plate of $$50$$ $$mm$$ thickness. Drill spindle speed is $$500$$ $$rpm,$$ feed is $$0.2$$ $$mm/rev$$ and drill point angle is $${118^ \circ }.$$ Assuming $$2$$ $$mm$$ clearance at approach and exit, the total drill time (in seconds) is
GATE ME 2012
7
The figure shows an incomplete schematic of a conventional lathe to be used for cutting threads with different pitches. The speed gear box $${U_v}$$ is shown and the feed gear box $${U_s}$$ is to be placed. $$P,Q,R$$ and $$S$$ denote locations and have no other significance. Changes in $${U_v}$$ should $$NOT$$ affect the pitch of thread being cut and changes in $${U_s}$$ should NOT affect the cutting speed.
The correct connections and the correct placement of $${U_s}$$ are given below
GATE ME 2008
8
If each abrasive grain is viewed as a cutting tool, then which of the following represents the cutting parameters in common grinding operations?
GATE ME 2006
9
A $$600$$ $$mm$$ $$ \times \,\,30\,\,mm$$ flat surface of a plate is to be finish machined on a shaper. The plate has been fixed with the $$600$$ $$mm$$ side along the tool travel direction. If the tool over-travel at each end of the plate is $$20$$ $$mm,$$ average cutting speed is $$8$$ $$m/min,$$ feed rate is $$0.3$$ $$mm/stroke$$ and the ratio of return time to cutting time of the tool is $$1:2,$$ the time required for machining will be
GATE ME 2005
10
Through holes of $$10$$ $$mm$$ diameter are to be drilled in steel plate of $$20$$ $$mm$$ thickness. Drill spindle speed is $$300$$ $$rpm,$$ feed $$0.2$$ $$mm/rev$$ and drill point angle is $${120^0}.$$ Assuming drill over travel of $$2mm$$ the time for producing a hole will be
GATE ME 2004
11
The time taken to drill a hole though a $$25$$ $$mm$$ thick plate with the drill rotating at $$300$$ $$rpm$$ and moving at a feed rate of $$0.25$$ $$mm$$/revolution is
GATE ME 2002
12
The abrasive material used in grinding wheel selected for grinding of ferrous alloys is
GATE ME 2000
13
Machine tool, structures are made ................. for high process capability (tough/ rigid/ strong)
GATE ME 1995
14
Determine the transformation ratio $$(TR)$$ of the gear train connecting the spindle and the lead screw of $$4TPI$$ required to cut $$1.0mm$$ pitch screw threads in a center lathe
GATE ME 1995
15
GATE ME 1995
16
A grinding wheel $$A$$ $$27$$ $$K7$$ $$V$$ is specified for finish grinding of a $$HSS$$ cutting tool. What do you understand about the wheel from the above code. Is this an appropriate choice?
GATE ME 1994
17
A milling cutter having $$8$$ teeth is rotating at $$150$$ $$rpm.$$ If the feed per tooth is $$0.1$$ $$mm,$$ the speed in $$mm$$ per minute is
GATE ME 1993
18
Component process
GATE ME 1992
19
A milling cutter having $$10$$ teeth is rotating at $$100$$$$rpm$$. The table feed is set at $$50mm$$ per minute. The feed per tooth in $$mm$$ is
GATE ME 1991
20
Match the products and their manufacturing process
GATE ME 1991
21
For cutting double start screw threads of pitch $$1.0$$ $$mm$$ on a lathe, the thread cutting tool should have a feed rate of
GATE ME 1991