Related Questions

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
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
The materil used to coat inside the face of CRT is ___________.
A Carbon
B Sulphur
C Silicon
D Phosphorous
If a disk has a bad spot on its surface, the spot is called a ----
A Disk crash
B Disk error
C Disk scanner
D Disk sector
 If a disk has a bad spot on its surface, the spot can be called a – 
A Disk error
B Disk crash
C Disk scanner
D Disk sector
To produce an old photograph, a photographer charges x dollars to make a negative, 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph, how many dollars the photographer charges to make a negative?
A 3
B 3.5
C 4
D 4.5
To produce an old photograph, a photographer charges x dollars to make a negative 3x/5 dollars for each of the first 10 prints, and x/5 dollars for each print in excess of 10 prints. If 45 dollars is the total charge to make a negative and 20 prints from an old photograph, how many dollars the photographer charges to make a negative?
A 3
B 3.5
C 4
D 4.5
In phase-shift control method the control is carried out by varying the of grid voltage.
A magnitude
B polarity
C phase
D any of the above
E none of the above
CRT হল একটি ---
A Bus
B Printer
C Keyboard
D Monitor
Flood guns bombard the phosphor surface of the tube in which one of the following types of CRT technology?
A Direct view storage tube
B Raster scan CRT
C Refresh-vector CRT
D Stroke CRT
E None of the above

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