Related Questions

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.
A Twice
B Four times
C Eight times
D Sixteen times
The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)
A $$2\pi \sqrt {\frac{{\text{q}}}{I}} $$
B $$2\pi \sqrt {{\text{q}}I} $$
C $$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$
D $$\frac{1}{{2\pi }}$$
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)
A $${\text{r}}\sin \varphi $$
B $${\text{r}}\cos \varphi $$
C $${\text{r}}\tan \varphi $$
D $$\frac{{\text{r}}}{2}\cos \varphi $$
The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as
A Bending moment
B Twisting moment
C Torsional rigidity
D Flexural rigidity
The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it
A improves the efficiency
B helps the rotor teeth to remain under the stator teeth
C helps in reducing the tendency of the rotor teeth to remain under the stator teeth
D improves the power factor
In ______ machines, the size of the shaft is decided by the critical speed which depends on the deflection of the shaft.
A small
B medium
C large
D any of the above
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be
A 0.8 d
B 1.2 d
C 1.57 d
D 1.8 d
A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is
A Slop speed operation
B High starting torque
C Low windage losses
D All of the above
Determine power rating of an electric motor if it runs at 1440 rpm and line shaft transmits torque of 75 Nm. Assume Reduction ratio =1.6
A 10.36 kW
B 11.3 kW
C 7.068kW
D 9.12kW
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)
A $$\frac{{\text{d}}}{8}$$
B $$\frac{{\text{d}}}{6}$$
C $$\frac{{\text{d}}}{4}$$
D $$\frac{{\text{d}}}{2}$$

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