Read the following passage carefully.

Richa is helping her mother make juice. Her mother asks her to use the mixer. On using the mixer, Richa notices that the body of the mixer is heating up more than usual. She also notices that the mixer stops working every time it heats up. It starts working again after it has cooled down.

Now, answer the following questions.

(a) Why do you think the mixer is heating up?

(b) Why does the mixer stop working every time it heats up?

(c) What steps should be taken by Richa to solve this problem?

(d) If the mixer is used continuously, what do you think will happen to it?

(a) The mixer is heating up because of friction in the moving parts (motor, bearings, blades) and overloading (too much fruit/ice) or running for a long time makes the motor work harder, creating extra heat.

(b) Most mixers have a thermal safety device (thermal fuse) and when the motor gets too hot, this device cuts off the electricity to protect the motor. When it cools, it allows the mixer to run again.

(c) The following steps must be taken by Richa to solve this problem :

• Reduce the load : Blend in small batches; add a little water if the mixture is too thick.
• Give rest : Run the mixer in short intervals (e.g., 30–60 seconds on, then rest).
• Use correct speed for the task : Don’t force the lowest speed for hard items.
• Check ventilation : Keep the mixer on a clear surface so air can circulate.
• Sharpen the blades of the jars.
• Get it serviced to lubricate the motor to reduce friction between moving parts which will prevent overheating.

(d) If the mixer is used continuously the increased friction between its moving parts will cause wear and tear of the mixer leading to expensive repairs or replacement.