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WorksheetsUnit 10 Summary
Total questions: 15
Worksheet time: 8mins
A mechanical energy convertor changes __________________________.
mechanical energy to mechanical power
mechanical energy to a different form of mechanical energy
mechanical energy to thermal, electrical, or fluid energy
fluid, electrical or thermal energy to mechanical energy
In an alternator, mechanical energy of the rotating rotor is converted to electrical energy. An alternator is ________________________.
a mechanical energy converter
a fluid energy converter
an electrical energy converter
a thermal energy converter
The wind pushes against the blades of a windmill. The shape of the blades produces a side thrust on the blades as the wind strikes them. This thrust causes the blades to spin. This sequence of events is an example of converting _________________________.
fluid energy to electrical energy
fluid energy to another form of fluid energy
fluid energy to mechanical energy
mechanical energy to fluid energy
The common unit of thermal energy in the SI system is the _____________.
calorie
watt-second
newton
newton-meter
An inertia welder uses friction between two mechanically moving parts to weld pieces of metal together. This process converts _________ energy to thermal energy.
mechanical
fluid
electrical
heat
A bimetallic strip bends because ________________________________.
the two different types of metals are bonded together and expand at the same rate
the two different types of metals are bonded together and expand at different rates
the two different types of metals are not exposed to the same temperature
A vane-type water pump uses rotating vanes to pull water through the pump and force it out at a higher pressure. The water pump is an example of a ______________________.
mechanical-to-fluid energy convertor
fluid-to-mechanical energy convertor
fluid-to-electrical energy convertor
mechanical-to-electrical energy convertor
Which of the devices identified below is a thermal energy converter?
electric motor
heart pacemaker
water pump
inertia welder
A turbine converts _______________________.
electrical energy to thermal energy
fluid energy to electrical energy
fluid energy to rotational energy
electrical energy to fluid energy
Which of the devices below converts electrical energy to thermal energy?
automobile alternator
soldering iron
turbine
windmill generator
Ten kilowatt-seconds of electrical energy are the same as _____ joules of electrical energy. (Remember: 1 watt·sec = 1 joule.)
10
100
1,000
10,000
A solenoid that is 60% efficient requires 60 joules of electrical input energy to move the solenoid plunger. The mechanical output of this solenoid device is equal to ____.
36 J/sec
72 J/sec
36 N·m
72 N·m
A calrod unit (an electrical heating element) is used in a small steam engine to heat water and produce steam. The steam in turn drives a piston that produces rotating mechanical energy. The sequence of energy conversion—from initial input to final output—is ___________________________.
electrical to mechanical to thermal
electrical to thermal to fluid to mechanical
thermal to electrical to thermal
thermal to electrical to fluid to mechanical
The revolving blades of a ventilator fan pull air through the fan on one side and push air away on the other side. The fan blades are a _______________________.
mechanical-to-thermal energy convertor
fluid-to-mechanical energy convertor
electrical-to-fluid energy convertor
mechanical-to-fluid energy convertor
The efficiency of an energy convertor ____________________.
often exceeds 100%
is always less than 100%
ever depends on energy losses in the conversion process
