Questions and answers for exam Preparation

MCQs

Total Questions : 408 | Page 5 of 41 pages

Question 41. Which of the following statement is wrong?

The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool.
The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools.
The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools.
The ceramic tools can withstand temperature upto 600°C only.

Discuss Question

Answer: Option D. -> The ceramic tools can withstand temperature upto 600°C only.
Answer: (d).The ceramic tools can withstand temperature upto 600°C only.

Question 42. Climb milling is chosen while machining because

the chip thickness increase gradually
it enables the cutter to dig in and start the cut
the specific power consumption is reduced
better surface finish can be obtained

Discuss Question

Answer: Option B. -> it enables the cutter to dig in and start the cut
Answer: (b).it enables the cutter to dig in and start the cut

Question 43. The material which on machining produces chips with built up edge is

brittle material
tough material
hard material
ductile material

Discuss Question

Answer: Option D. -> ductile material
Answer: (d).ductile material

Question 44. The broaching operation in which either the work or the tool moves across the other, is known as

pull broaching
push broaching
surface broaching
continuous broaching

Discuss Question

Answer: Option C. -> surface broaching
Answer: (c).surface broaching

Question 45. In down milling, the thickness of chip is

minimum at the beginning of the cut and maximum at the end of the cut
maximum at the beginning of the cut and minimum at the end of the cut
uniform throughout the cut
none of these

Discuss Question

Answer: Option B. -> maximum at the beginning of the cut and minimum at the end of the cut
Answer: (b).maximum at the beginning of the cut and minimum at the end of the cut

Question 46. The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is

3.75 m/min
5 m/min
7.5 m/min
15 m/min

Discuss Question

Answer: Option C. -> 7.5 m/min
Answer: (c).7.5 m/min

Question 47. The size of abrasive grain required in a grinding wheel depends upon the

amount of material to be removed
hardness of material being ground
finish desired
all of these

Discuss Question

Answer: Option B. -> hardness of material being ground
Answer: (b).hardness of material being ground

Question 48. The actual feed in centreless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)