11) Which of the following is a application of low pass RC circuit
a) integrator
b) differentiator
c) comparator
d) attenuator
a) integrator
b) differentiator
c) comparator
d) attenuator
12) Dark current in a semiconductor photo diode is
a) the forward bias current
b) the forward saturation current
c) the reverse saturation current
d) the transient current
13) In a open circuited p-n junction diode space charge density at the junction is
a) maximum
b) zero
c) positive
d) negative
14) Material used for fabrication of tunnel diode is
a) Ge or GaAs
b) Si and GaAs
c) Si and InSb
d) Ge and InSb
15) Early effect in BJT refers to
a) avalanche breakdown
b) thermal runaway
c) base narrowing
d) zener breakdown
16) The Darlinton pair is mainly used for
a) impedance matching
b) wideband voltage amplification
c) power amplification
d) reducing distortion
17) When a transistor is used in switching mode then what is the turn ON time?
a) sum of delay time and rise time
b) sum of raise time and storage time
c) sum of delay time and storage time
d) sum of rise time and fall time
18) Electron emitters are heated by
a) directly
b) indirectly
c) either directly or indirectly
d) none
19) When electrons are emitted from an emitter by supplying heat energy, what is the process
a) thermionic emission
b) field emission
c) photo emission
d) rectification
20) The electrode of a vacuum tube which emits electrons is known as
a) grid
b) cathode
c) plate
d) anode
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