Question: The following present serious difficulty in designing reactor shield_________________?

• 1. alpha particles
• 2. beta particles
• 3. thermal neutrons
• 4. fast neutrons and gamma rays

Question: In order to have constant clain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be________________?

• 1. greater than 1.0
• 2. less than 1.0
• 3. equal to zero
• 4. equal to 1.0

Question: A fission chain reaction in uranium can be developed by________________?

• 1. slowing down fast neutrons so that Uz fission continues by slow motion neutrons
• 2. accelerating fast neutrons
• 3. absorbing all neutrons
• 4. using moderator

Question: The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be________________?

• 1. more
• 2. less
• 3. same
• 4. zero

Question: The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is__________________?

• 1. higher cost of nuclear fuel
• 2. high initial cost
• 3. high heat rejection in condenser
• 4. lower temperature and pressure condi-tions

Question: The presence of reflector in nuclear power plants results in___________________?

• 1. increased production of neutrons
• 2. complete absorption of neutrons
• 3. controlled production of neutrons
• 4. decreased leakage of neutrons

Question: The most practical fuel for a thermo-nuclear reactor, both from econocical and nuclear consideration is____________________?

• 1. plutonium
• 2. uranium
• 3. deuterium
• 4. thorium

Question: The coolant used in boiling water reactor is________________?

• 1. Co2
• 2. pressurised water
• 3. mixture of water and steam
• 4. liquid metal

Question: Effective moderators are those materials which contain____________________?

• 1. light weight atoms
• 2. heavy weight atoms
• 3. critical atoms
• 4. zero weight atoms

Question: A fast breeder reactor uses_______________?

• 1. 90% U-235
• 2. U-238
• 3. U-235
• 4. Pu-239