The quiz will consist of Multiple Choice Questions (MCQs) and cover Lessons 1 to 22.
If a silicon diode
conducts at 2mA and whose n = 1, the slope of diode will be at
2/25 ohms
There is no voltage
drop across diode when forward biased, in case of
ideal diode model
Diode small signal
resistance rd at bias current of 5mA for n = 1 will be
5 ohms
Addition of
impuritirs in semiconductor material to produce more current is called
dopping
To which of the winding of
transformer alternating voltage is applied
primary winding
A transformer will be out of phase
when
output voltage
is 180 degree out of phase with input voltage
For secondary turns of 10 and
primary turns of 20, the turn ratio is
20:10
which relation is true for
transformer primary and secondary power
V2I2=V1I1
For I-V curve of a diode, a changing
current from 20 mA to 10mA and voltage from 0.72v to 0.78v, cause AC resistance
of value
6ohms
Thermal ionization in semiconductor
results creating of
both free electrons and holes
When germanium crystal is doped with
a phosphorus atom, it becomes
N-type semiconductor
A transformer has turn ratio 5 and
the secondary voltage is 10v, the primary voltage is
2v
For forward biased condition of P-N
junction
+ve
polarity to P electrode and -ve polarity to N electrode
The width of the
depletion layer of a junction
is increased under reverse bias
For a P-N junction
under forward bias
more forward current flows
A transformer may
consists of ________.
two windings
In a P- type
semiconductor material, the majority carriers are ________.
Holes
In an N-type
semiconductor material, the majority carrier are
electron
Analysing the
farward biase region of junction diode , the value of constant voltage,VT is
________.
25.02mV
Secondary voltage is
greater in magnitude as compared to primary voltage in a ________.
step up transformer
Which transformer
gives less voltage at secondary as compared to primary?
step down transformer
When the turn ratio
of a transformer is 10 and primary ac voltage is 6v, the secondary voltage is
________.
60v
There is a ________
energy gap between valence and conduction band.
forbidden
Using exponential
model for a diode that conducts at 1mA with n = 2, the change in current due to
change of voltage by 5mv will be
0.11mA
If 10w of power is
applied to primary of an ideal transformer with a turn ratio of 5, the power
delivered to the secondary load is
50w
The primary and secondary winding of
transformer are
physically isolated
If turn ratio of a
transformer is 5 and secondary current is 2A, the primary current is ________.
10A
True or false, hole
current is opposit of electron current?
True
A transformer will be
out of phase when ________.
output
voltage is 180 degree out of phase with input voltage
Charge of 2c and 5c
will
repel each other
Which battery applies a greater potential
difference?
12v
When one resistance in
a series string is open
The current is zero in all
resistances
For a P-N junction
under farward bias
more farward current flows
A diode is a
one way conductor
In farward biased Characteristics of junction diode, current value is
Is=ie^V/VT
The primary and
secondary winding of transformer are
physically isolated
A certain transformer
has 500 turns in the primary winding and 2500 turns in the secondary winding.The
turn ratio is
25
If N denotes the total
number of nodes, then number of nodal equations in nodal analysis will be
Number of equations=N-1
Using superposition
theorem, for a circuit containing independent sources, any remaining current
source is
made zero by replacing them by
open circuit
The PIV of a half wave
rectifier circuit with a shunt capacitor filter is
Vm
The primary function
of a filter is to
Stabilize dc level of the output voltage
The base region of a
p-n-p transistor is
Very thin and heavily doped
with electrons
Voltage multipliers
are usually used in low current high voltage applications e.g
Cathode ray tube in television
The current flow
across the base-emitter junction of a p-n-p transistor consists of
Mainly holes
In an P- type
semicondutor material , the majority carriers are
holes
Which light bulb will not glow in given circuit
bulb 3
Three bulbs are
connected in series of a battery, what would happen if any one bulb is opened.
no current will flow
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