Related Questions

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
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.
For hauling muck from the tunnel, the following type of muck-car is used:
A Muck box
B Side dump car
C U-bottom
D All of these
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
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
A survey was conducted among the students of Khulna University to find out how many forms of physical exercise usually swam, 25% said they usually did jogging, 20% said they played cricket, 15% said they usually played football and 20 respondents said they did not take any form of exercise. From the above findings it can be concluded that.
A The student of khulna University do not usually take physical exercise.
B No respondent took more than one form of exercise.
C The method of data collection was not valid.
D Some of the respondents took more than one form of exercise.
The maximum efficiency of a screw jack is
A 1 – sinφ/ 1 + sinφ
B 1 + sinφ/ 1 – sinφ
C 1 – tanφ/ 1 + tanφ
D 1 + tanφ/ 1 – tanφ
Efficiency of a screw jack is given by
A tan(α + ɸ)/tanα
B tanα/ tan(α + ɸ)
C tan(α – ɸ)/tanα
D tanα/tan(α – ɸ)

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