Test: Shafts, Keys & Couplings - 1 - Mechanical Engineering MCQ

For a hollow shaft of inner diameter band outer diameter D, the modulus of rupture is

A solid circular shaft of diameter d is subjected to a pure torsional load T. When the same load is applied to a hollow shaft of outside diameter d and ratio of inside to outside diameter is the ratio of stress in the solid to that in the hollow shaft will be

Shaft design is generally made for the torsional moment k_t T where factor k_t takes into account the nature of load, for suddenly applied loads with shocks, the factor k_t is usually taken as '

A shaft of elliptical section (semi-major axis a and semi-minor axis b) is subjected to twisting moment T. The maximum shear stress occurs at the ends of minor axis and is given by

Some of the mechanical properties are
1. sufficiently high strength
2. low sensitivity to stress concentration
3. wear resistant                                                                                                                                                                                     

4. good machinability
5. ability to withstand shock and impact loads 

The desirable properties for a shaft and axle material are

The shaft consists of a number of shafts which are connected in axial direction by means of couplings called as

Consider the following statements regarding keys:
1. Key is used to connect the transmission shaft to rotating machine elements.
2. Key is used to connect the transmission shaft to reciprocating machine elements.
3. The primary function of the key is to transmit the torque from the shaft to the hub of the mating element and vice versa.
4. The keyway on the shaft results in better stress distribution.

Which of the above statements are valid?