1
GATE PI 2014
MCQ (Single Correct Answer)
+2
-0.6
A $$80$$ $$mm$$ thick steel plate with $$400$$ $$mm$$ width is rolled to $$40mm$$ thickness in $$4$$ passes with equal reduction in each pass, by using rolls of $$800mm$$ diameter. Assuming the plane-strain deformation, what is the minimum coefficient of friction required for unaided rolling to be possible?
A
$$0.111$$
B
$$0.158$$
C
$$0.223$$
D
$$0.316$$
2
GATE PI 2012
MCQ (Single Correct Answer)
+2
-0.6
In a single pass rolling process using $$410mm$$ diameter steel rollers, a strip of width $$140mm$$ and thickness $$8mm$$ undergoes $$10\% $$ reduction of thickness. The angle of bite in radians is
A
$$0.006$$
B
$$0.031$$
C
$$0.062$$
D
$$0.600$$
3
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
In multi-pass operation, a round bar of $$10$$ $$mm$$ diameter and $$100$$ $$mm$$ length is reduced in cross-section by drawing it successively through a series of seven dies of decreasing exit diameter. During each of theses drawing operations, the reduction in cross-sectional area is $$35\% $$. The yield strength of the material is $$200$$ $$MPa.$$ Ignore strain hardening.

The total true strain applied and the final length (in $$mm$$), respectively, are

A
$$2.45$$ and $$817$$
B
$$2.45$$ and $$345$$
C
$$3.02$$ and $$2043$$
D
$$3.02$$ and $$33.$$
4
GATE PI 2011
MCQ (Single Correct Answer)
+2
-0.6
In multi-pass operation, a round bar of $$10$$ $$mm$$ diameter and $$100$$ $$mm$$ length is reduced in cross-section by drawing it successively through a series of seven dies of decreasing exit diameter. During each of theses drawing operations, the reduction in cross-sectional area is $$35\% $$. The yield strength of the material is $$200$$ $$MPa.$$ Ignore strain hardening.

Neglecting friction and redundant work, the force (in $$kN$$) required for drawing the bar through the first die, is

A
$$15.71$$
B
$$10.21$$
C
$$6.77$$
D
$$4.39$$
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12