Related Questions

While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
A both ends fixed
B both ends hinged
C one end fixed and other end hinged
D one end fixed and other end free.
In a screw jack, the effort required to lower the load W is given by
A P = W tan (α – ɸ)
B P = W tan (α + ɸ)
C P = W tan (ɸ – α)
D P = W cos (α + ɸ)
In a screw jack, the effort required to lift the load is given by (where W = Load lifted, α = Helix angle, and φ = Angle of friction.)
A P = W tan (α - φ)
B P = W tan (α + φ)
C P = W tan (φ - α)
D P = W cos (α + φ)
John, Jack, Joseph and Jordan participated in a running race. Only the winner finished the race in 10 minutes. Which two pieces of information can tell you who the winner was? (i) John finished the race in 16 minutes . (ii) Joseph finished the race earlier than Jack by 2 minutes. (iii) Jack finished the race later than Jordan by 4 minutes. (iv) Jordan finished the race earlier than John by 6 minutes. (v) John finished the race later than Joseph by minutes.
A I and II
B I and IV
C II and III
D II and V
In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)
A $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$
B $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
C $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$
D $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves
A Axially upwards
B Axially downwards
C Axially upwards or downwards
D None of these
If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated
A on its outer spindle with a relative motion between the vernier and graduated scale of lower plate
B on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
C on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
D on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
The load cup of a screw jack is made separate from the head of the spindle to
A enhance the load carrying capacity of the jack
B reduce the effort needed for lifting the working load
C reduce the value of frictional torque required to be countered for lifting the load
D prevent the rotation of load being lifted
Jack is taller than Peter,and Bill is shorter than Jack.Which of the following statements would be most accurate?
A Bill is taller than Peter
B Bill is shorter than Peter
C Bill is as tall as Peter
D It is impossible to tell whether Bill or Peter is taller
Jack has b blueberries. He uses 30 percent of the blueberries to make muffins , each of which requires m blueberries. He uses the rest of the rest of the blueberries to make pies, each pie of which retires p blueberries. which of the following describes the number of blueberry pies Jack can make ?
A 3b/10m
B 3b/10p
C 7b/10m
D 7b/10p

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