Machining | Production Engineering | GATE MCQs (solved)

GATE ME solved Questions on Machining(Production Engineering)

Question #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 2017 Set 1, 1 mark]


Question #2

A block of length 200mm is machined by a slab milling cutter 34mm in diameter. The depth of cut and table feed are set at 2mm and 18mm/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 2017  Set 1, 2 marks]


Question #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 2016 Set 2, 1 mark]


Question #4

Internal gears are manufactured by
(A) hobbing
(B) shaping with pinion cutter
(C) shaping with rack cutter
(D) milling

[GATE 2016 Set 3, 1 mark]


Question #5

In a machining operation, if the generatrix and directrix both are straight lines, the surface obtained is
(A) cylindrical
(B) helical
(C) plane
(D) surface of revolution

[GATE 2015 Set 3, 1 mark]


Question #6

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
(A) 15°32′ and 12.16 mm
(B) 18°32′ and 15.66 mm
(C) 11°22′ and 10.26 mm
(D) 10°32′ and 14.46 mm

[GATE 2015 Set 3, 2 marks]


Question #7

Match the Machine Tools (Group A) with the probable Operations (Group B):

Group A Group B
P: Centre Lathe 1: Slotting
Q: Milling 2: Counter-boring
R: Grinding 3: Knurling
S: Drilling 4: Dressing

(A) P-1, Q-2, R-4, S-3

(B) P-2, Q-1, R-4, S-3

(C) P-3, Q-1, R-4, S-2

(D) P-3, Q-4, R-2, S-1

[GATE 2014 Set 2, 1 mark]


Question #8

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

(A) 1.00

(B) 1.25

(C) 1.50

(D) 1.75

[GATE 2014 Set 2, 2 marks]


Question #9

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 2014 Set 4, 1 mark]


Question #10

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 workpiece is 160 rpm. The material removal rate in mm 3/s is

(A) 160

(B) 167.6

(C) 1600

(D) 1675.5

[GATE 2013, 1 mark]


Question #11

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°. Assuming 2 mm clearance at approach and exit, the total drill time (in seconds) is

(A) 35.1

(B) 32.4

(C) 31.2

(D) 30.1

[GATE 2012. 2 marks]


Question #12

Internal gear cutting can be performed by

(A) Milling

(B) Shaping and rack cutter

(C) Shaping with pinion cutter

(D) Hobbing

[GATE 2008, 1 mark]


Question #13

A good cutting fluid  should have

(A) low thermal conductivity

(B) high specific heat

(C) high viscosity

(D) High density

[GATE 2003, 1 mark]


Question #14

Quality screw threads are produced by

(A) thread milling

(B) thread chasing

(C) thread cutting with single point tool

(D) thread casting

[GATE 2003, 1 mark]


Question #15

Trepanning is performed for

(A) finishing a drilled hole

(B) producing a large hole without drilling

(C) truing a hole for alignment

(D) enlarging a drilled hole

[GATE 2002, 1 mark]


Question #16

The hardness of a grinding wheel is determined by the

(A) hardness of the abrasive grains

(B) ability of the bond to retain abrasives

(C) hardness of the bond

(D) enlarging a drilled hole

[GATE 2002, 1 mark]


Question #17

A lead screw with half nuts in  a lathe, free to rotate in both directions has

(A) V-threads

(B) with-worth threads

(C) Buttress threads

(D) Acme threads

[GATE 2002, 1 mark]


Question #18

Abrasive material used in grinding wheel selected for grinding ferrous alloys is

(A) SiC

(B) diamond

(C)Al2O3

(D) boron carbide

[GATE 2000, 1 mark]

 

Ask your doubts in the comment section below

 

Practice other topics from Production Engineering:

Metal Cutting

Casting 

Welding

 

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