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Power Plant Engineering MCQ Questions & Answers | Mechanical Engineering

Learn Power Plant Engineering MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-2 section-1

Each section contains 100 MCQs on Power Plant Engineering .
11
The most practical fuel for a thermonuclear reactor, both from economical and nuclear consideration is
Discuss
Answer & Solution
Answer: Option C
Solution:
Most commercial nuclear reactors use normal water (also called light water) as a neutron moderator.
Some reactor designs, such as the CANDU reactor, use heavy water.
A heavy water molecule contains deuterium (Hydrogen-2), which is an isotope of hydrogen that has a neutron in its nucleus in addition to the proton.
12
In nuclear fission each neutron that causes fission releases
Discuss
Answer & Solution
Answer: Option D
Solution:
A schematic nuclear fission chain reaction. 1. A uranium-235 atom absorbs a neutron and fissions into two new atoms (fission fragments), releasing three new neutrons and some binding energy
Power Plant Engineering mcq solution image
13
The commonly used material for shielding is
Discuss
Answer & Solution
Answer: Option A
Solution:
When the reactor is in operation, a large amount of radioactivity is generated.
The materials used to build this shield are concrete, water and lead.
14
The material most commonly used for shielding is
Discuss
Answer & Solution
Answer: Option C
Solution:
When the reactor is in operation, a large amount of radioactivity is generated.
The materials used to build this shield are concrete, water and lead.
15
Which of the following is the heaviest?
Discuss
Answer & Solution
Answer: Option C
Solution:
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms.
Atoms are extremely small; typical sizes are around 100 picometers.
16
Which of the following particles is the lightest?
Discuss
Answer & Solution
Answer: Option B
Solution:
An electron is a negatively charged subatomic particle.
It can be either free or bound to the nucleus of an atom.
The invariant mass of an electron is approximately 9.109×10−31 kilograms,
17
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to
Discuss
Answer & Solution
Answer: Option A
Solution:
A moderator, in nuclear power plants, is a medium introduced into the fuel mass in order to slow down the speed of fast moving neutrons.
The moderator, which is of importance in thermal reactors, is used to moderate, that is, to slow down, neutrons from fission to thermal energies.
Commonly used moderators include regular water, solid graphite and heavy water.
18
Reflector in nuclear power plants _________ neutron leakage.
Discuss
Answer & Solution
Answer: Option B
Solution:
A reflector is a region of unfueled material surrounding the core.
Its function is to scatter neutrons that leak from the core, thereby returning some of them back into the core.
Reflector in nuclear power plants decreases neutron leakage.
19
The unit of radioactivity is
Discuss
Answer & Solution
Answer: Option C
Solution:
1 curie = 3.7 x 1010 radioactive decays per second [exactly].
1 becquerel = 1 radioactive decay per second = 2.703 x 10-11 Ci.
20
One gram of uranium will produce energy equivalent to approximately
Discuss
Answer & Solution
Answer: Option B
Solution:
One gram of uranium will produce energy equivalent to approximately 4.5 tonnes of high grade coal