Production Engineering Multiple Choice Questions with Answers - Set 04

Practice Test: Question Set - 04

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1. What is the type of welding defect is caused due to stresses on heating and cooling called?

(A) Incomplete penetration

(B) Shrinkage void

(C) Slag Entrapment (Inclusions)

(D) Incomplete fusion

Answer: Option B
Explanation: Slag entrapment (inclusions) welding defect is caused due to stresses on heating and cooling.

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2. What is the type of welding defect caused due to poor deposition of weld rod is called?

(A) Porosity

(B) Undercut

(C) Under fill

(D) Crack

Answer: Option A
Explanation: Porosity is a welding defect caused due to poor deposition of weld rod.

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3. What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

(A) Porosity

(B) Undercut

(C) Under fill

(D) Crack

Answer: Option B
Explanation: Under cut is a type of welding defect caused due to poor manipulation of weld rod or a dirty joint.

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4. What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

(A) Ultrasonic welding

(B) Forge welding

(C) Electron beam welding

(D) Friction welding

Answer: Option D
Explanation: Friction welding is a type of joining process where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained.

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5. If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?

(A) Forehand welding

(B) Flux cored ARC welding

(C) Electro slag welding

(D) Pulsed spray welding

Answer: Option A
Explanation: Forehand welding is a welding technique in which the welding torch is directed towards the progress of welding.

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6. Which of the following is the correct data structure for solid models?

(A) Solid part - faces - edges - vertices

(B) Solid part - edges - faces - vertices

(C) Vertices - edges - faces -   solid parts

(D) Vertices - faces- edges - solid parts

Answer: Option C
Explanation: Correct data structure for solid models is given by,
Vertices - edges - faces - solid parts

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7. For generating a Coon’s surface we require

(A) A set of grid points on the surface

(B) A set of grid control points

(C) Four bounding curves defining the surface

(D) Two bounding curves and a set of grid control points

Answer: Option C
Explanation: Coon’s surface is obtained by blending four boundary curves. The main advantage of Coon’s surface is its ability to fit a smooth surface through digitized points in space such as those used in reverse engineering.

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8. Internal gear cutting operation can be performed by

(A) Milling

(B) Shaping with rack cutter

(C) Shaping with pinion cutter

(D) Hobbing

Answer: Option C
Explanation: 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.

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9. If a particular Fe-C alloy contains less than 0.83% carbon, it is called

(A) High speed steel

(B) Hypo eutectoid steel

(C) Hyper eutectoid steel

(D) Cast iron

Answer: Option B
Explanation: 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”

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10. In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2 mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principle cutting edge angle is 90⁰, the shear angle in degree is

(A) 20.56

(B) 26.56

(C) 30.56

(D) 36.56

Answer: Option B
Solution:
Given: D = 150 mm, V = 90 m/min, f = 0.24 mm/rev.
d = 2mm, tc = 0.48 mm, α = 0, λ= 90⁰
Uncut chip thickness, t = f sin λ = 0.24 × sin90⁰ = 0.24 mm
Chip thickness ratio, r = t/tc = (0.24/ 0.48) = 1/2
From merchant’s theory,
Shear angle, tanΦ = rcos α /(1 - sin α) = 0.5cos0⁰/ (1 - 0.5sin0⁰) = 0.5
Φ = tan⁻¹ (0.5) = 26.56⁰

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11. As tool and work are not in contact in EDM process

(A) No relative motion occurs between them

(B) No wear of tool occurs

(C) No power is consumed during metal cutting

(D) No force between tool and work occurs

Answer: Option D
Explanation: In EDM, the thermal energy is employed to melt and vaporize tiny particles of work-material by concentrating the heat energy on a small area of the work-piece. A powerful spark, such as at the terminals of an automobile battery, will cause pitting or erosion of the metal at both anode & cathode. No force occurs between tool & work.

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12. Hardness of steel greatly improves with

(A) Annealing

(B) Cyaniding

(C) Normalizing

(D) Tempering

Answer: Option B
Explanation: Hardness is greatly depends on the carbon content present in the steel. Cyaniding is case-hardening with powered potassium cyanide or potassium Ferro cyanide mixed with potassium bi-chromate, substituted for carbon. Cyaniding produces a thin but very hard case in a very short time.

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

(A) V-threads

(B) Whitworth threads

(C) Buttress threads

(D) Acme threads

Answer: Option D
Explanation: A lead-screw with half nuts in a lathe, free to rotate in both directions had Acme threads. When it is used in conjunction with a split nut, as on the lead screw of a lathe, the tapered sides of the threads facilitate ready to engagement and disengagement of the halves of the nut when required.

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14. Hot rolling of mild steel is carried out

(A) At recrystallization temperature

(B) Between 100⁰C to 150⁰C

(C) Between recrystallization temperature

(D) Above recrystallization temperature

Answer: Option D
Explanation: Hot rolling of metal means working of metals when heated sufficiently (above the re-crystallizing temperature) to make them plastic and easily worked.

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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

Answer: Option B
Explanation: In trepanning, the cutting tool produces a hole by removing a disk-shaped piece (core), usually from flat plates. A hole is produced without reducing all the material removed to chips, as is the case in drilling. Such drills are used in deep-hole drilling machines for making large hollow shafts, long machine tool spindles etc.

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View All Answers

(1) Answer: Option B
(2) Answer: Option A
(3) Answer: Option B
(4) Answer: Option D
(5) Answer: Option A
(6) Answer: Option C
(7) Answer: Option C
(8) Answer: Option C
(9) Answer: Option B
(10) Answer: Option B
(11) Answer: Option D
(12) Answer: Option B
(13) Answer: Option D
(14) Answer: Option D
(15) Answer: Option B

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