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Q1- Choose the correct choice: (five only) 15 Marks 1- Graphite is one of the alternative power reactor a- Coolant b-Moderator c- fuel cladding 2- Uranium carbide is one of the alternative power reactor a- Fuel y b-Moderator c- fuel cladding 3- Ceramics is one of the alternative power reactor a- Coolant b-Moderator c- fuel cladding 4- LMCFBR differs from all reactor types (Magnox, AGR, HTGCR, PWR and BWR) because a- it is a nuclear reactor capable of producing more fissile product than it takes in b- it is a nuclear reactor capable of producing less fissile product than it takes in c- it is a nuclear reactor incapable of producing more fissile product 5- In CANDU reactor the pressure tube must be insulated from the moderator, permitting a- Free choice of coolant b-free choice of fuel c-free choice of cladding 6- If natural uranium fuel is to be used economically: c- high a- High burn-up must be achieved b- low burn-up must be achieved power level must be achieved Q2-Choose the correct choice: (five only) 15 Marks 1- Threshold mass sustain a chain reaction is called: a- Atomic mass b-critical mass c-mass number 2- The primary function of cladding is: a- Keep fission products bottled up with in the fuel where they are generated. b- Enhance the probability of neutron moderation c- Prevent excessive pressure build up during active life of fuel element. 3- Nuclear energy is the energy associated with change in the: a- Valence electron b- number of electrons c- atomic nucleus 4- The neutrons causing fission is in the thermal range, since, the most power reactors are c-direct cycle reactor type a- thermal type b-power reactor type 5- A nuclear sustained chain reaction fission of uranium can be caused by + a- Plasma b-thermal neutrons c-beta particles 6- Nuclear reactors differ in their qualities depending on a nuclear fuel, reactor coolant used and the type of medium used (moderator) b- moderator arrangement c- fuel enrichment Q3-Choose the correct choice: (five only) 15 Marks 1- Heavy hydrogen combined with oxygen is called: a- Ordinary water b-heavy water c-light water 2- Some neutrons are lost by absorption that not lead to fission is called: