# Power-to-weight ratio: Quiz

Question 1: Different designs trade off power-to-weight ratio to increase comfort, cargo space, fuel economy, emissions control, ________ and endurance.
Peak oilPetroleumEnergy securityEnergy crisis

Question 2: Fluid pumps convert mechanical or electrical work into movement or pressure changes of a fluid, or storage in a ________.
Steam engineBoilerPressure vesselBoiler explosion

Question 3: The power-to-weight ratio is typically calculated from power and mass, although ________ is usually measured as weight on a calibrated weighing scale.
MassClassical mechanicsForceGeneral relativity

Question 4: A variety of effects can be harnessed to produce thermoelectricity, thermionic emission, pyroelectricity and ________.

Question 5: An ________ uses electrical energy to provide mechanical work, usually through the interaction of a magnetic field and current-carrying conductors.
Electrical generatorElectric motorAC motorInduction motor

Question 6: The degree in which the deliverable torque associated with the body overcomes the force of ________ upon the body and yields a net positive linear climbing acceleration, or mechanical advantage, is then
Equivalence principleGravitationIntroduction to general relativityGeneral relativity

Question 7: If the ________ and drag loses are negligible, then the powerplant will convert essentially all its power to either delivering kinetic energy to the body or lifting the weight of the body.
FrictionForceMassLift (force)

Question 8: The actual useful power of any traction engine can be calculated using a ________ to measure torque and rotational speed.
HorsepowerDynamometerElectric motorTransmission (mechanics)

Question 9: ________ take mechanical work to regenerate thermal energy in a temperature gradient.
Vapor-compression refrigerationEcoCuteAir conditionerHeat pump

Question 10: In ________, instantaneous power is the limiting value of the average rate of change of work done per unit time as the time interval Δt approaches zero.
Classical mechanicsForceInertiaEnergy