Exam (elaborations)
EGEE 101 Midterm Questions and Answers 2024
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Exam of 7 pages for the course EGEE at EGEE (EGEE 101 Midterm)
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EGEE 101 MidtermWhich has more potential energy
a). a cubic mile of water (a lake) behind a 300 ft tall dam
b). a car moving at 120 mph across the Bonneville Salts Flats
c). an oil tanker moving through the Suez Canal
d). an atomic bomb in a silo in North Dakota - answerA).
B and C aren't stationary, and the height of D is 0.
PE=mgh
Which has more chemical energy?A.A cubic mile of water (a lake) behind a 300 ft tall
dam
B.A car moving at 120 mph across the Bonneville Salt Flats
C.An oil tanker moving through the Suez Canal
D.An atomic bomb in a silo in North Dakota - answerAnswer: C.
A and B have no chemical energy. D has nuclear energy. C is a tanker full of oil, which
is chemical
Which has more nuclear energy?A.A cubic mile of water (a lake) behind a 300 ft tall
dam
B.A car moving at 120 mph across the Bonneville Salt Flats
C.An oil tanker moving through the Suez Canal
D.An atomic bomb in a silo in North Dakota - answerAnswer: D is the only option with
any nuclear energy
Which series goes from least energetic to most?
A.X-rays, visible, ultraviolet, radio
B.Radio, infrared, ultraviolet, X-rays
C.Gamma, infrared, visible, microwave
D.Microwave, ultraviolet, visible, radio - answerAnswer: B
Refer to the graph from Lecture 2
What energy transformation occurs in the engine of the car?
A. Chemical to potential
B. Heat to mechanical
C. Mechanical to heat
D. Kinetic to potential - answerB
, What energy transformation occurs in the brakes of the car?
A. Chemical to potential
B. Heat to mechanical
C. Mechanical to heat
D. Kinetic to potential - answerC
The inside of a concrete basement wall is 65° FThe outside is 55°F. Heat will leave the
building through this wall via
A.Convection
B.Conduction
C.Radiation
D.None of the above/don't know - answerAnswer: B
Conduction occurs through solid media...in this case, a concrete wall
Which has higher power?•
A: 1000 Joules used in 10 seconds•
B: 1000 Joules used in 100 seconds•
C: 1000 Joules used in 1000 seconds - answerAnswer: A1000J/10s = 100 WB = 10 WC
=1W
Which has higher energy?•
A: 1000 Joules used in 10 seconds•
B: 1000 Joules used in 100 seconds•
C: 1000 Joules used in 1000 seconds•
D: They all have the same energy - answerAnswer: D. Each option has 1000 Joules of
energy
A power plant consumes 1000 MJ of energy to produce 350 MJ of electric energy. What
is the efficiency of this process?
•A: 130%•B: 142%•C: 35%•D: 30%•E: 10% - answerAnswer: C. 350MJ/1000MJ
A power plant produces 100 MJ of electricity and 300 MJ of wasted Heat. What is the
Efficiency?
•A: 20%•B: 25%•C: 80%•D: 400%•E: 33% - answerAnswer: BTotal energy = electricity +
wasted heat = 100 MJ + 300 MJ = 400 MJ
Efficiency = useful energy/total energy = 100 MJ of electricity / 400 MJ = 0.25
A power plant consumes 100 MJ of Energy, of which only 24 MJ are wasted heat.
What is the efficiency?•A: 0.76•B: 0.24•C: 0.076•D: 1.00•E: 1.24 - answerAnswer: A).
Useful energy = Total energy - Wasted energy = 100 MJ - 24 MJ = 76 MJ
Efficiency = useful energy/total energy = 76 MJ / 100 MJ = 0.76
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