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Free download in PDF Production Engineering MCQs & Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
81
When 50 mm rod is turning at a spindle speed of 200 rpm the cutting speed would be
[A]
30-35 m/min
[B]
12 - 15 m/min
[C]
10 - 12 m/min
[D]
15 - 20 m/min
82
Spindle speed in a lathe for turning a 40 cm dia rod at a cutting speed of 30 m/min would be
[A]
100 rpm
[B]
206 rpm
[C]
238 rpm
[D]
336 rpm
83
Which one of the following materials will have lowest cutting speed?
[A]
High carbon steel
[B]
Brass
[C]
Mild steel
[D]
Aluminium
Answer: High carbon steel
84
Which one of the following materials will have highest cutting speed?
[A]
Aluminium
[B]
Tool steel
[C]
Cast iron
[D]
Bronze
85
If the rake angle on a HSS lathe tool is 25 degrees the materials being machined is
[A]
Cast iron
[B]
Aluminium
[C]
High speed steel
[D]
Carbon steel
86
A master gauge is
[A]
Used by masters
[B]
Used by all mechanics
[C]
A standard gauge for checking accuracy of gauges used on shop floors
[D]
A gauge used by experienced technician
Answer: Used by all mechanics
87
Sintered tungsten carbides can be machined by
[A]
Conventional processes
[B]
Grinding only
[C]
Diamond tools only
[D]
Electro machining process
Answer: Electro machining process
88
High rate of oscillation of tools in ultrasonic machining is produced by
[A]
D.C. motor
[B]
A.C. motor
[C]
Pneumatic generator
[D]
Oscillator
89
Chisels used for metal cutting are
[A]
Hardened
[B]
Annealed
[C]
Hardened and tempered
[D]
Annealed, hardened and tempered
Answer: Annealed, hardened and tempered
90
Chisels for metal cutting are
[A]
Hardened all over
[B]
Hardened in the middle
[C]
Hardened at cutting edge
[D]
Hardened at random
Answer: Hardened all over
91
A diamond point chisel is used for
[A]
Flat surfaces
[B]
Round surfaces
[C]
Convex surfaces
[D]
V-shaped grooves
92
A hot chisel is one which is
[A]
Red hot
[B]
Used to cut red hot materials
[C]
Used to cut cold materials
[D]
None of these
Answer: Used to cut red hot materials
93
Cold heading is a process of
[A]
Chipless machining
[B]
Electro-machining process
[C]
Explosive forming
[D]
Pneumatic mechanical forming
Answer: Chipless machining
94
Size of a shaper is generally specified by
[A]
The area of machined surface per hour
[B]
Maximum travel of cutting tool
[C]
Length, breadth and height of machine
[D]
Quick return ratio
Answer: Maximum travel of cutting tool
95
International Prototype Meter is made of
[A]
Cast iron
[B]
Mild steel
[C]
Copper
[D]
Platinum-iridium alloy
Answer: Platinum-iridium alloy
96
In centreless grinding the work piece advances by
[A]
Push given by operator
[B]
Hydraulic force
[C]
Force exerted by grinding wheel
[D]
Force exerted by regulating wheel
Answer: Force exerted by regulating wheel
97
The backlash between gears is expressed in terms of
[A]
Difference between addendum and dedendum
[B]
The difference between PCD of two gears
[C]
The actual gear width on pitch circle minus the standard gear width for given number of teeth on gear
[D]
Clearance between faces of the mating gears
Answer: Clearance between faces of the mating gears
98
Indexing for 107 divisions can be done by
[A]
Simple indexing
[B]
Compound indexing
[C]
Differential indexing
[D]
Compound differential indexing
Answer: Differential indexing
99
Simple indexing using a dividing head of turn ratio 40 for 6 division would be
[A]
14 holes in 21 hole circle plate
[B]
6 turns
[C]
26 holes in 21 hole circle plate
[D]
6 turns and holes in 21 hole circle plate
Answer: 6 turns and holes in 21 hole circle plate
100
If a drill does not cut; the probable cause would be
[A]
Drill blunt
[B]
Material difficult to drill
[C]
Speed low
[D]
Absence of coolant
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