Q #1:-
Fig.1 Shows part of a circuit used in a ticket machine to check size of coins.
+ 6V
R
Input A
output a
Input B
Box Z
Indicator Lamp
X and Y are LDRS
00
Box Z is logic Gate.
OOV (fig. 1)
a) At a certain level, the resistance of 'X' is 4000 andP.d. across 'R' is 2.0 V.
i) Determine'P.d.' across X.
(1)
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Answer:
Read the following and answer any four questions:
The following is the diagram of an electric motor:
a) Which part of the electric motor in the above figure) can be used as an armature after
some modifications?
(1) POXY
(n) YXOP
(I) ABCD
(iv) ABPQ
Page (4)
b) What are these modifications in the part mentioned above?
1) large number of turns
il) s soft iron core
(1) both ctromagnet in order to make a
Commercial motor?
(1) X and Y
(ii) Pando
(im) R
(iv) None of these
d Which part in the above diagram is a device that reverses the direction of flow of
current through a circuit?
1) X and Y
(11) P and Q
(117) R
(iv) None of these
Which part in the above diagramis used as an axle in the electric motor?
6) X and Y
(11) P and q
(in) R
(iv) None of these
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