DSSSB Mill Wright Instructor Paper 2014

DSSSB Mill Wright Instructor Paper 2014

A simple mechanisms has
(a) 1 link
(b) 2 links
(c) 3 links
(d) 4 links

A slider crank mechanisms is a special case of
(a) 3 – bar mechanisms
(b) 4 – bar mechanisms
(c) 2 – bar mechanisms
(d) 6 – bar mechanisms

Kinematic pairs are those which have two elements that
(a) have line contact
(b) have surface contant
(c) permit relative motion
(d) have dynamic forces

Relationship between the number links (L) and number of pairs (P) is
(a) L = 2P -4
(b) L = 2P + 4
(c) L = P – 4
(d) L = 2P – 2

Hookes joint consist of
(a) two forks
(b) one fork
(c) three forks
(d) four forks

A flywheel connected to punching machine has to supply energy of 400Nm while running at a mean angular speed of 20 rad/s. If the total function of speed is not to exceed +/- 2%. Find the mass moment of inertia in Kg-Meter square.
(a) 34
(b) 19
(c) 25
(d) 43

For Hartnell Governor with equal arms lift of the sleeve is given by as
(a) h1 = x/y(r1+r)
(b) h1=x/y(r1-r)
(c) h1=x(r1+r)/2y
(d) h1= x(r1-r)/2y

Sensitiveness of Governor is defiend as
(a) range of speed/mean speed
(b) mean speed/ range of speed
(c) mean speed x range of speed
(d) range of speed/2 x mean speed

The path of contact in involute gears is
(a) a straight line
(b) involute path
(c) curved line
(d) circle

Rankine theory (maximum principal stress theory) of failure is applicable for the following type of material
(a) brittle
(b) ductile
(c) elastic
(d) tough

The equation for combined stress due to Eccentric axial loading is given by
(a) P/A +/- Pey/l
(b) A/P +/- Pey/l
(c) A/P
(d) Pey/l

If a load W is applied instantaneously on a bar of cross section A then the stress induced in the bar in worst case will be
(a) W/A
(b) W/2A
(c) 2(W/A)
(d) None of the above

Stress concentration is caused due to
(a) variation of load
(b) abrupt changes of the cross section
(c) different environment condition
(d) None of the above

Maximum principal shear stress theory is applicable for
(a) ductile materials
(b) brittle materials
(c) elastic materials
(d) None of the above