34.

36.

37.

Regarding Filament circuit, which of the following is not true ?

(A) filament transformer, primary winding obtain high voltage from high voltage transformer

(ए) current flow is typically 3-3 A

(€) गाल transformer is a step down transformer

(D) filament transformer is placed in the same oil filled grounded metal tank as the high voltage
transformer

Regarding inherent filtration, which of the following is not true ?

(A) materials responsible are glass envelope, insulating oil and window in the housing
(B) varies between 0.5 - 1 mm aluminium equivalent

(C) beryllium window tubes are used to increase inherent filtration

(D) filtration increases the mean energy of X-ray beam ‘

Regarding added filtration, which of the following is not true ?

(வ) aluminium is an excellent filter for low energy radiations

(8) copper is an excellent filter for high energy radiations

(£) copper is never used by itself as filter material

12) incombined filter, aluminium absorbs most of the radiation and copper absorbs characteristic
radiation of aluminium

Regarding K-edge filters, which of the following is not true ?

(ക) അമ്‌ use of k-absorption edge of elements with atomic numbers mare than 60

(ह) ‏ااه‎ advantages when imaging barium and 100170

(C) heavy metal filters decreases high energy photons, but increases low energy photons
(D) heavy metal filters offers decreased absorbed dose and increase image contrast

Regarding X-ray beam restrictors, which of the following is not true ?

(ക) collimator is the best all round X-ray beam restrictor

(8) when decreasing the size of X-ray field by the collimators, factor must be reduced to keep
the radiographic density constant

(0 PBL is automatic collimator

(12) collimator functions as decrease in scatter radiation

Regarding grids, which of the following is not true ?

(2) interspace materials are either aluminium or organic compounds

(8) grids with aluminium interspace material are stronger than organic interspaces
{C) invented by Dr. Gu-stave Bucky in 1913

(D) exposure factors when using aluminium interspaces are lower

Regarding grid ratio, which of the following is not true ?

(A) grid cassette fairly have high grid ratio

(ए) higher the grid ratio, better is the function

(©) paralle] grids are used in fluoroscopic spot film device

(7) प s are indicated at the top of grid by the manufacturer

Regarding grid, which of the following is not true ?

(வி primary transmission indicates only the primary radiation absorbed

(8) Bucky factor indicates the absorption of secondary radiation

(0) higher the grid ratio, the contrast improvement factor will be high

(D) the contrast improvement factor is the ultimate 1051 ೦8 grid performance

153/2014 7
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