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.
A screw is said to be over hauling screw, if its efficiency is
A less than 50%
B more than 50%
C equal to 50%
D none of the mentioned
When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be
A Knuckle threads
B Square threads
C Acme threads
D Buttress threads
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
A screw is said to be over hauling screw, if the
A Friction angle is less than helix angle
B Friction angle is more than helix angle
C Friction angle is equal to helix angle
D Efficiency of screw is 100%
A screw is said to be a self locking screw, if its efficiency is
A Less than 50%
B More than 50%
C Equal to 50%
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
If a D.C. motor is to be selected for conveyors, which rioter would be preferred?
A Series motor
B Shunt motor
C Differentially compound motor
D Cumulative compound motor
Apron conveyors are used for
A Heavy loads & short runs
B Small loads & long runs
C Heavy loads & long runs
D None of these
Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of 'scrappers'?
A Bucket conveyor
B Flight conveyor
C Screw conveyor
D Both B and C

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