Related Questions

The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?
A They are mechanically strong
B They do not require any voltage for filament heating
C Both (A) and (B)
D None of the above
The metal rectifiers, as compared to mercury arc rectifiers
A operate on low temperatures
B can operate on high voltages
C can operate on heavy loads
D give poor regulation
E none of the above
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?
A Mechanical rectifiers
B Copper oxide rectifiers
C Selenium rectifiers
D Electrolytic rectifiers
Mercury, in arc rectifiers, is chosen for cathode because
A Its ionization potential is relatively low
B Its atomic weight is quite high
C Its boiling point and specific heat are low
D All of the above
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.
A accelerates
B decelerates
C any of the above
D none of the above
In a three-phase mercury arc rectifiers each anode conducts for
A One-third of a cycle
B One-fourth of a cycle
C One-half a cycle
D Two-third of a cycle
The applications of selenium rectifiers are usually limited to potential of
A 10 V
B 30 V
C 60 V
D 100 V
E 200 V
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as
A maximum grid voltage
B critical grid voltage
C any of the above
D none of the above
Glass rectifiers are usually made into units capable of D.C. output (maximum continuous rating) of
A 100 A at 100 V
B 200 A at 200 V
C 300 A at 300 V
D 400 A at 400 V
E 500 A at 500 V
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
A 25, 35
B 40, 50
C 60, 70
D 75, 85

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