Question

While selecting an electric motor for any application, we do not consider

i. Cost

ii. Size

iii. Rating

iv. Mechanical characteristics

v. Electrical characteristics

Amongst the given, select which is/are correct?

1. iii and iv
2. None 
3. Only iv
4. ii and iii

Answer 1

Correct Answer - Option 2 : None 

Selection of motor:

The selection of an electric motor depends primarily on the conditions under which it has to operate and the type of load it has to handle.

The main guiding factors for such selection are as follows:

1) Electrical characteristics:

• Starting characteristics
• Running characteristics
• Speed control
• Braking

2) Mechanical considerations:

• Type of enclosure
• Type of bearings
• Method of power transmission
• Type of cooling
• Noise level

3) Size and rating of motors:

• Requirement for a continuous, intermittent, or variable load cycle
• Overload capacity

4) Cost:

• Capital cost
• Running cost

Hence,
From the given options everything is considered for the selection of an electric motor.