# Basic Mechanical Engineering Questions

1. High speed electron beam in electron beam welding is focused on weld spot using
(1) vacuum

(2) inert gas lens

(3) optical lens

(4) magnetic lens
2. Radius of the function circle of a journal bearing depends on coefficient of function and
(1) angular velocity of the journal

(3) magnitude of the force on the journal

(4) journal and bearing clearance
3. Availability of a system at any given state is
(1) a property of the system

(2) the maximum work obtainable as the system goes to dead state

(3) the total energy of the system

(4) the maximum useful work obtainable as the system goes to dead state
4. The gauss divergence theorem relates certain
(1) surface integral to volume integrals

(2) surface integral to line integral

(3) vector quantities to other vector quantities

(4) line integral to volume integrals
5. The principles of motion economy are mostly used while conducting
(1) a method study on an operation

(2) a time study on an operation

(3) a financial appratisal of an operation

(4) a feasibility study of the proposed manufacturing plant

6. The second moment of a circular area about the diameter is given by (D is the diameter).
(1) πD4/4

(2) πD4/16

(3) πD4/32

(4) πD4/64
7. Two mating spur gears have 40 and 120 teeth respectively. The pinion rotates at 1200 rpm and transmits a torque of 20 Nm. The torque transmitted by the gear is
(1) 6.6 Nm

(2) 20 Nm

(3) 40 Nm

(4) 60 Nm
8. The number degrees of freedom of a planar linkage with 8 links and 9 simple revolute joints is
(1) 1

(2) 2

(3) 3

(4) 4
9. For a circular shaft of diameter d subjected to torque T, the maximum value of the shear stress is
(1) 64T/πd3

(2) 32T/πd3

(3) 16T/πd3

(4) 8T/πd3
10. Consider an incompressible laminar boundary layer flow over a flat plate of length L, aligned with the direction of an oncoming uniform free stream. If F is the ratio of the drag force on the front half of the plate to the drag force on the rear half, then
(1) F<1/2

(2) F=1/2

(3) F=1

(4) F>1
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