Match the following lists pertaining to standard proportions for various dimensions of the bushed-pin flexible coupling:
A. Outside diameter of hub
B. Length of hub
C. Pitch circle diameters of pins
D. Thickness of output flange
4. 2d to 3d
5. 3d to 4d
A B C D
(a) 6 1 5 3
(b) 2 6 4 7
(c) 2 1 5 3
(d) 6 2 4 7
where d is the diameter of shaft.
A sleeve or muff coupling is designed as
Torsional shear stress induced in the sleeve is checked by the following equations.
The outer diameter of sleeve in the design of sleeve coupling is taken as
where, d is the diameter of shaft
If d is the diameter of shaft, then in designing a sleeve coupling, the length of sleeve is prescribed by the identity
Which is not the correct proportion of the solid flanged (marine type flange) coupling in terms of diameter d of the shaft?
Thickness of flange = 0.33 d
A key connecting a flange coupling to a shaft is likely to fail in
The bolts in rigid flanged coupling connecting two shafts transmitting power are subjected to
Which of the following is a flexible coupling
Odlham coupling is the flexible coupling used to connect two shaft have lateral misalignment.
Which material is used for bushes in the bushed pin type of flexible coupling
To have some flexibility rubber is used as a material for bushes in bushed pin type flexible coupling.
In the assembly design of shaft, pulley and key the weakest member is
Key is the weakest member in the assembly of shaft, pulley and key. Key acts as a safety device, whenever there is excess load appears on the pulley key first and it keeps safer to shift and pulley.
The shearing area of a key of length l breadth ’b ’ depth ‘h’ is equal to
Shearing area = b x L
The key shown in the above figure is a
Woodruff key is a sunk key, in the form of an almost semi-circular disc of uniform thickness. Due to its shape it has self aligning property.
Which of the following key have self aligning property
A key made from a cylindrical disc having segmental cross-section is know as
Which key transmits power through frictional resistance only
Saddle key is a key that fits in the key way of the hub only. In this case there is no keyway provided on the shaft and friction between shaft, key and hub prevents relative motion between the shaft and the hub and power is transmitted by means of friction only.
Kennedy keys are used for applications like
Two shaft will have equal strength if
Which one of the following loading is considered for design of axles
Axle is used to support the wheel hence it is subjected to only bending moment. Since it has no role to play in transmission of power hence it is not subjected to twisting moment.
When a shaft transmits power through gears the shaft experience
Match List-I with List-ll and select the correct answer using the codes given below:
A. Rigid coupling
B. Oldham coupling
C. Universal joint
D. Gear coupling
1. Permits greater torque capacity for a given size
2. Permits substantial angular misalign-ment of intersecting axes
3. Permits substantial lateral offset and little angular alignment
4. Permits almost no misalignment
A B C D
(a) 1 2 3 4
(b) 4 2 3 1
(c) 1 3 2 4
(d) 4 3 2 1