Que. 1 A long speciman of p type semiconductor material
A is +ively charged
B is electrically neutral
C has an electric field directed along its length
D acts as a dipole
Que. 2 Acceptor impurity atoms in Si result in
A increase forbidden gap
B reduced forbidden gap
C new discreate energy level slightly below conduction leval
D new discreate energy leval slightly above conduction level
Que. 3 in any conductor hall voltage V(H) is proportional to
A B
B B^2
C 1/B
D 1/B^2
Que. 4 In BJT with I(infinite)=1 micro.A, a=0.99,the value of I(CEO) is
A 0.01 micro.A
B 0.001 micro.A
C 1 micro.A
D 1000 micro.A
Que. 5 The current gain of a BJT is
A g(m)*r(o)
B g(m)/r(o)
C g(m)*r(pi)
D g(m)/r(pi)
Que. 6 The velocity of the holes in the n region at X=0
A 12*10^3 cm/sec
B 5*10^3 cm/sec
C 2*10^4 cm/sec
D none of these
Que. 7 The spectral dencity of pink noise varies as
A 1/f^2
B f^2
C 1/f
D f
Que. 8 zener diode is used as a
A current regulator
B voltage booster
C voltage regulator
D power regulator
Que. 9 three phase half wave rectification,if the input frequency is 50hz then output frequency is
A 100 hz
B 150hz
C 75hz
D 25hz
Que. 10 For getting low regulated voltages are used
A zeners
B SCR
C transistor
D chopper
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