# Engineering Drawing Questions and Answers – Types of Coupling

This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Types of Coupling”.

1. What type of connection is coupling?
a) Permanent connection
b) Temporary connection
c) It can’t connect
d) A connection which can be modified

Explanation: Coupling is a linkage between two rotating shafts at the ends. It is a permanent connection, which transmits power. Choosing a correct coupling based on our purpose is mandatory and saves money and time.

2. When do we need to connect two shafts without any mis-alignment, which have collinear axes, which type of couplings is preferable?
a) Flexible coupling
b) Non – aligned coupling
c) Loose couplings
d) Rigid coupling

Explanation: When two shafts have collinear axes and are having good lateral and angular alignment can be coupled with rigid couplings. They transmit rotational motion and encourages no mis-alignment.

3. Find the type of coupling the following diagram is representing?

a) Split-muff coupling
b) Half-lap muff coupling
c) Butt-muff coupling
d) Flanged coupling

Explanation: In the given figure the two ends of the shafts are connected butt against each other, hence this coupling is called butt-muff coupling.

4. Claw coupling comes under which type of couplings?
a) Rigid coupling
b) Disengaging coupling
c) Flexible coupling
d) Flanged coupling

Explanation: Claw couplings have a number of identical claws engaged into corresponding recesses, which helps in the intermittent transmission of power Thus as per requirements the coupled shafts can engage and disengage. Hence these couplings come under disengaging couplings.

5. Couplings used in marine propeller shafts are ________
a) Solid flanged couplings
b) Half-lap muff couplings
c) Butt muff couplings
d) Cone coupling

Explanation: Coupling marine propeller shafts requires greater robustness and reliability. Hence solid flanged couplings are used.

6. When two shafts are not coaxial which type of couplings are used?
a) Rigid couplings
b) Flexible couplings
c) Dis-engaging couplings
d) Non-aligned couplings

Explanation: When two shafts axes are not coaxial then non-flanged couplings are used. Universal couplings cushion coupling, and Oldham couplings are non-flanged coupling types.

7. ______________ couplings allow the relative rotation or any changes in the alignments of the shafts to a certain limit.
a) Rigid couplings
b) Muff couplings
c) Flexible couplings
d) Flanged couplings

Explanation: A flexible coupling contains a flexible medium which can take care of the changes in the misalignments. Perfect alignment is not possible due to wear and tear and other reasons, hence flexible couplings are used in such situations.

8. Find the type of coupling the following diagram is representing.

a) Butt muff coupling
b) Bush pin coupling
c) Split muff coupling
d) Half lap coupling

Explanation: For the given diagram, in the ends of the shafts, for a short length taper is provided where shafts are allowed to overlap. This happens in half-lap coupling.

9. In compression couplings, friction between the shafts and sleeves aids in power transmission.
a) True
b) False

Explanation: In compression couplings, we use compressible steel sleeve to couple the shafts at the end, where friction acts, which aids in power transmission.

10. In which of the following couplings, two forks, which are keyed to the shafts, are pin joined to a central block.
a) Rigid coupling
b) Muff coupling
c) Flanged coupling
d) Universal coupling

Explanation: In universal coupling, forks are keyed at the ends of the shafts and then they are pin joined to a central block.

11. Which of the coupling is used to couple the two shafts which are parallel to each other and the axes of shafts are separated by a distance.
a) Muff couplings
b) Cone couplings
c) Claw coupling
d) Oldham coupling

Explanation: In Oldham coupling, two shafts which are parallel to each other but are separated by a distance are coupled. They can take angular and axial misalignment.

12. Application of Oldham couplings should be free from backlash.
a) True
b) False

Explanation: Oldham coupling is designed in a way they are used for zero-backlash performances. Springs are used in order to reduce couplings backlash.

13. The H.P rating for the cushion coupling is ________
a) 0.2 to 1
b) 100 to 450
c) 0.2 to 450
d) 20 to 200

Explanation: Cushion couplings are the most commonly used flexible couplings which are used for coupling of non-aligned type of shafts. The H.P rating for this coupling is 0.2 to450.

14. Claw coupling is used for slow seed shafts.
a) False
b) True

Explanation: Claw couplings have identical claws on one of the flanges which engage into the corresponding recesses of another flange. These are used for slow speed shafts.

15. Which type of motion is easily transmitted through universal coupling?
a) Axial motion
b) Rotational motion
c) Axial and rotational motion
d) It cannot transmit any type of motion

Explanation: Universal coupling has forks keyed to the end of the shafts which are pin joined to the central block. Hence these universal couplings are capable of transmitting rotational motion.

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