69.

70.

71.

72.

73.

74.

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The illumination is directly proportional to the cosine of the angle made by the normal
to the illuminated surface with the direction of the incident flux.

Above statement is associated with

A) Planck’s law

) Macbeth’s law of illumination

) Bunsen’s law of illumination

( Lambert's cosine law

2طت

Capacitors of optimal size are installed at suitable locations in a distribution
system for

1. Improved voltage regulation

2. Reduction in distribution power losses

3. Reduction of KVA rating of distribution transformers.

A) 1 alone 8) 1 and 2

©) 1,2and3 D) 3 alone

The use of zener diode connected in a (७ circuit used for triggering an SCR is to
A) Delay the generation of triggering pulse
B) Speed up the generation of triggering pulse
©) Supply constant voltage to UJT for correct firing
) Supply a variable voltage to UJT as source voltage varies

The input impedance of a CRO is
A) Zero B) Around 100 ohms
C) Around 1 kilo ohms D) Around 1 Mega ohms

A mirror is provided behind the pointer in measuring instruments for

A) With the help of the mirror it may be seen whether the pointer is bent or not

B) The scale is illuminated through the mirror

C) Reading errors due to inclined observation are eliminated by removing parallax
between the pointer and its image in the mirror

D) None of these

For proper earthing, the earth wire should not be of size smaller than
A) 10 SWG copper B) 8 SWG copper
C) 6 SWG copper 0) 4 SWG copper

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