Monday, November 29, 2010

Test Questions

Three Heat Switch:

If the 2 elements each have a Resistance of 20.2ohms, and the voltage is 230V. What will its power output be in the low setting? (give your answer in kW)




Simmerstat:


A simmerstat has a fault, It is permanently ON and never turns OFF

Motors:


I don't know what my motor is when its on its running fine but when its turns off it makes no noise


Network:


If you leave a heater on in your house (230v), and it has a resistance of  79 Ohms.
If the power supply company charges you  14.3  cents for a unit, and you leave it on for 7 days  and 5 hrs , How much will it cost?
Give the answer in dollars.




Appliance Testing:

What is a safe resistance to operate an appliance



Protection:

What is the purpose of a fuse   a) short circuit   b) overload

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