Related Questions

In axial flow fans and turbines, fluid enters and leaves as follows
A Radially, axially
B Axially, radially
C Axially, axially
D Radially, radially
The axial flow compressor is preferred in aircraft gas turbines because of
A Low frontal area
B Higher thrust
C High pressure rise
D None of these
To obviate axial thrust, following gear drive is used
A Double helical gears having opposite teeth
B Double helical gears having identical teeth
C Single helical gear in which one of the teeth of helix angle a is more
D Mutter gears
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor and W = Axial compressive load on the spring)
A $$\frac{{{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$
B $$\frac{{2{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$
C $$\frac{{4{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$
D $$\frac{{8{\text{WD}}}}{{\pi {{\text{d}}^3}}} \times {\text{K}}$$
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is $$\tau $$. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be
A $$\frac{\tau }{2}$$
B $$\tau $$
C $$2\tau $$
D $$4\tau $$
When the axis of load lies in the plane of rivet group, then the most heavily loaded rivet will be the one which (where, Fa is the load shared by each rivet due to axial load and Fm is the shearing load due to moment in any rivet.)
A Is at the maximum distance from CG of the rivet group
B Is at the minimum distance from CG of the rivet group
C Gives the maximum angle between the two forces Fa and Fm
D Gives the minimum angle between the two forces Fa and Fm
The cavitation in reaction turbines is avoided, to a great extent by
A Installing the turbine below the tail race level
B Using stainless steel runner of the turbine
C Providing highly polished blades to the runner
D All of the above
Specific speed for reaction turbines ranges from
A 0 to 4.5
B 10 to 100
C 80 to 200
D 250 to 300
Reaction turbines are used for
A Low head
B High head
C High head and low discharge
D Low head and high discharge
The degree of reaction of an axial flow turbine is the ratio of isentropic temperature drop in a blade row to the
A Adiabatic temperature drop in the stage
B Total temperature drop
C Total temperature drop in the stage
D Total adiabatic temperature drop

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