Question

Speed of motor used in electric mixer has ________ RPM.

• A. 10000 to 12000
• B. 15000 to 17000
• C. 8000 to 10000
• D. 5000 to 8000

Hint:

Universal motors are ideal for mixers, vacuum cleaners, and portable power drills because they deliver high starting torque and operate at the high rotational speeds required for these applications.

Answer 1

The Correct Option is B

Step 1: Understanding Electric Mixer Requirements:
Domestic kitchen mixers and blenders require extremely high rotational speeds to grind and blend solid food ingredients efficiently.

Step 2: Motor Selection and Speeds:
Kitchen mixers utilize Universal Motors because they can operate at very high speeds on single-phase AC power. Under typical operating loads, these motors rotate at speeds ranging from 15000 to 17000 RPM (and can reach up to 20000 RPM under no-load conditions). Standard induction motors, by contrast, are limited to speeds below 3000 RPM at $50\text{ Hz}$.

Step 3: Conclusion:
Therefore, the typical speed range is 15000 to 17000 RPM, which corresponds to option (B).