Related Questions

The popular notion that a tree's age can be determined by counting number of internal rings in its trunk is generally true. Howeevr, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often →peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit →elav eing the tree with fewer rings than it would otherwise have. So only if the reliable measure of the tree's age. Which of the following is an assumption on whish the argument above depends?
A The growth of new rings in a trees is not a function of levels of precipitation.
B Only the Brazilaian ash loses rings because of excessive heat.
C One day of temperatures above 95 degrees Fahrenheit will cause the Brazilian ash to lose one ring.
D The internal rings of all tress are of uniform thickness
A rotary converter is a single machine with
A one armature and one field
B two armatures and one field
C one armature and two fields
D none of the above
The number of slip rings on a squirrel cage induction motor is usually
A Two
B Three
C Four
D None
Slip-rings in a synchronous motor carry
A direct current
B alternating current
C no current
D all of the above
A rotary converter combines the function of
A An induction motor and a D.C. generator
B A synchronous motor and a D.C. generator
C A D.series motor and a D.generator
D None of the above
A rotary converter in general construction and design, is more or less like
A a transformer
B an induction motor
C an alternator
D any 'C. machine
In a rotary converter armature currents are
A d.c. only
B a.c. only
C partly a.c. and partly d.c.
D none of the above
A rotary converter operates at a
A low power factor
B high power factor
C zero power factor
D none of the above
In __________ converter for ammonia synthesis, the catalyst is arranged in the form of a single continuous bed.
A Fauser-Monte Catini
B Claude
C Udhe
D Kellog
In a single phase power factor meter the phase difference between the currents in the two pressure coils is
A exactly 0°
B approximately 0°
C exactly 90°
D approximately 90°

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