Related Questions

Assume that the equipments maintenance is is done on consecutive instead of nonconsecutive days but that all other scheduling policies are unchanged . For how many of the six days can it be determined both whether the pool is cleaned and whether the equipments maintenance is done ?
A two
B three
C four
D five
__________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.
A Nitrogen
B Hydrogen
C Helium
D Carbon dioxide
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has
A High neutron absorption cross-section
B Low moderating efficiency
C High neutron scatter cross-section
D Low neutron absorption cross-section
Which of the following size reduction equipments employs mainly attrition for ultrafine grinding?
A Jet mills
B Fluid energy mill
C Micronizer
D All of the above
Heavy water is preferred over ordinary water as a coolant, because it.
A Acts both as an efficient coolant as well as a moderator
B Can be heated to a higher temperature without pressurizing
C Is less prone to radiation damage
D All of the above
__________ of water makes it a widely used coolant in heat exchangers.
A Low corrosiveness
B Low dirt factor
C High specific heat
D Low viscosity
Glycerene is used as a coolant in cooling of some engines instead of water, because
A Its higher boiling point (290°C) increases its heat carrying capacity
B Compartively less weight of coolant is required
C Smaller radiator can be used
D All of the above
Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.
A 5-10
B 15-20
C 30-35
D 35-40
Film boiling is usually not desired in commercial equipments, because
A The heat transfer rate is low in view of the large temperature drop
B It is difficult to maintain
C It is not economic
D None of these
In a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
A Increase
B Decrease
C Remain unchanged
D Either increase or decrease; depends on the coolant flow rate

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