Que. 1 The main advantage of TRAPATT diode over IMPATT diode is it's
A higher output
B higher efficiency
C lower noise
D capability to operate at higher freq.
Que. 2 in an unbiased pn junction the junction current is equilibrum is
A due to diffusion of majority carriers
B due to diffusion of minority carriers
C zero due to equal and opposite currents crossing the junction
D zero because no charges cross the junction
Que. 3 In Ge diode the cutin voltage is about
A 0.2v
B 0.6v
C 1.1v
D 2v
Que. 4 In a pnp transistor operating in the active region the concentration of
minority carriers holes in the n region at collector junction
J(e) is
A zero
B thermal equilibrium value p(no) of emittor
C thermal equilibrium concentration of holes in collector region
D same as at J(e)
Que. 5 In the uniformly doped abrupt p-n junction, the doping level of the n-side
is four times the dopinglevel of the p-side. the ratio of the deplation
layer widths is
A 0.25
B 0.5
C 1.0
D 2.0
Que. 6 An n-channel JFET has a pinch off voltage of Vp=-5v,Vds(max)=20v and
(delta)(m)=2mA/V.The minimum 'ON' resistance is achieved
in the JFET for
A V(gs)=-7v, V(ds)=0v
B V(gs)=7v, V(ds)=0v
C V(gs)=0v, V(ds)=20v
D V(gs)=-7v, V(ds)=20v
Que. 7 The reverse saturation current of a solar cell is 10 and the light generated
short ckt current is I for 1 sun illuminated. the open ckt voltage of
the solar cell under one sun illumination is
A KT/q ln(1+I(L)/I(O))
B q/KT ln(1+I(L)/I(O))
C KT ln(I(O)+I(L))
D KT ln(I(L)-I(O))
Que. 8 The need of centre tap is eliminited in full wave_______ rectifier
A vacuum tube
B semiconductor
C crystal diode
D bridge
Que. 9 When a lossy capzcitance with a dielectric of permittivity e and conducitivity
o- operates at a freq. w, the loss tangent for the capacitor is given by
A wo-/e
B we/o-
C o-/we
D o-we
Que. 10 Micro-program is
A The name of the source program in microcomputer
B the set of instructions indicating the primitive operations in
a system
C the general name of a MACRO'S in assembly language programming
D the name of program of very smallsize
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