The efficiency of a hydroelectric plant is the ratio (numerator to denominator)
ID: 1650128 • Letter: T
Question
The efficiency of a hydroelectric plant is the ratio (numerator to denominator) of the ______.
a. heat plus electricity produced to the water volume.
b. water outflow to the electrical energy input.
c. electricity output to the potential energy input.
d. electricity output to the water outflow.
Two purposes of water in a reactor core are:
a. Neutron absorber and heat transfer liquid.
b. Neutron absorber and lubricant.
c. Neutron moderator and lubricant.
d. Neutron moderator and heat transfer liquid.
Which of the following do fission and fusion reactions have in common?
a. Products have less mass than reactants
b. Reactants have less mass than products
c. Magnetic fields are required for containment
d. Liberation of neutrons
Why do radioactive wastes stay thermally hot for thousands of years?
a. Because nuclear waste is stored under high pressure.
b. Because of the long half-life of the waste.
c. Because of the thousands of tons of nuclear waste produced each year.
A bird sitting on a bare high voltage wire is not electrocuted because
a. of the high resistance of its body.
b. there is no electrical potential difference across its body.
c. its body is at a low electrical potential compared to the wire.
d. the high voltage across its feet produced a small current.
Explanation / Answer
Q1.
The efficiency of a hydroelectric plant is the ratio of the
Efficiency is the ratio of rate at which energy is output to the rate at which energy is input.
c. electricity output to the potential energy input.
Q2.
Two purposes of water in a reactor core are:
d. Neutron moderator and heat transfer liquid.
Q3.
Which of the following do fission and fusion reactions have in common?
a. Products have less mass than reactants
Q4.
Why do radioactive wastes stay thermally hot for thousands of years?
Half life of radioactive elements is very large for example, half life of Carbon-14 is 5730 years. Throughout their life the radioactive elements release energy, so the radioactive wastes stay thermally hot for thousands of years.
b. Because of the long half-life of the waste.
Q5
A bird sitting on a bare high voltage wire is not electrocuted because
a. of the high resistance of its body.
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