問題一覧
1
If a resistance to which a constant
voltage is applied is halved, what
power dissipation will result?
Doubled
2
If the reference point is changed
to the earth point then any voltage
taken w.r.t. the earth is known as
Absolute potential
3
Two ac sources feed a common
variable resistive load as shown in
figure. Under the maximum power
transfer condition, what is the
power absorbed by the load
resistance RL?
625 W
4
In a parallel circuit, the
individual branch currents are
inversely proportional to the branch resistance values
5
When a material becomes a
superconductor, its resistivity
becomes
zero
6
Delta to wye or wye to delta
transformation technique is
applied to a ______ network.
three-terminal
7
A straight conductor 500 mm long is
moved with constant velocity at
right angles both to its length and
to a uniform magnetic field. Given
that the e.m.f. induced in the
conductor is 2.5 V and the velocity
is 5 m/s, calculate the flux
density of the magnetic field. If
the conductor forms part of a
closed circuit of total resistance
5 ohms, calculate the force on the
conductor.
0.25N
8
A current of 6 A flows for 10
minutes. What charge is
transferred?
3600 C
9
The magnetic field due to a
current-carrying conductor takes
form of:
concentric circles
10
Voltage drop is the:
difference in potential between 2 points
11
The effect on an air gap in a
magnetic circuit is to:
increase the reluctance
12
A strong permanent magnet is
plunged into a coil and left in the
coil. What is the effect produced
on the coil after a short time?
There is no effect
13
An RLC series circuit is
underdamped. To make it overdamped,
the value of R
has to be increased
14
The drift velocity of electrons
is
very small as compared to speed of light
15
Calculate the resistivity of ntype semiconductor from the
following data, Density of holes =
5 x 1012 cm-3. Density of electrons
= 8 x 1013 cm-3, mobility of
conduction electron = 2.3 x 104 cm2/
V-sec and mobility of holes = 100
cm2/V-sec
0.34 Ω-m
16
Assertion (A): Two transistors
one n-p-n and the other p-n-p are
identical in all respects (doping,
construction, shape, size). The np-n transistor will have better
frequency response.
Reason (R): The electron mobility
is higher than hole mobility.
Both A and R are true and R is correct explanation of A
17
From the given circuit below, we
can conclude that.
transistor is faulty
18
In an ideal op-amp, which is not
true?
CMRR is zero
19
What is the use of the
compensation capacitor in op-amp?
Decreases the slew rate of op-amp
20
In a low pass filter as below,
find the cut-off frequency for the
following circuit.
636 Hz
21
Ripple factor of bridge full
wave rectifier is _________.
0.482
22
If peak voltage on a bridge full
wave rectifier circuit is 5V and
diode cut-in voltage is 0.7, then
peak inverse voltage on diode will
be _________.
4.3V
23
For a base current of 10 μA, what
is the value of collector current
in common emitter if βdc = 100
1 mA
24
Which of the following
oscillators is suitable for
frequencies in the range of
megahertz?
Hartley
25
Figure is a 24 Vr stabilized
power supply. The zener is 24 V,
600 mW. The minimum zener current
is 10 mA. Proper values R and
maximum load current are
320 Ω, 15 mA
26
In a class C power amplifier the
input signal has a frequency of 250kHz. If the collector current
pulses are 0.1 μs wide, the duty
cycle of current waveform is
2.5%
27
In figure, voltage across R2 = +
10 V. If VBE = 0.7 V and VE = 0.7
V and RE = 10 kΩ, current through
RE is
0.93 mA
28
The main advantage of CMOS
circuit is
low power consumption
29
Assertion (A): In design of
circuit using BJT, a derating
factor is used.
Reason (R): As the ambient
temperature increases, heat
dissipation becomes slower.
Both A and R are true and R is correct explanation of A
30
As temperature increases the
number of free electrons and holes
in an intrinsic semiconductor
increases
31
A conductor is said to have
resistance of one ohm if a
potential difference of one volt
across its terminals causes a
current of X ampere to flow through
it. What will be the value of X?
1
32
A 25 Ω resistor has a voltage
of 150 sin377 t. Find the
corresponding power.
900 sin² 337 t
33
According to Kirchhoff’s voltage
law, the algebraic sum of all IR
drops and e.m.f. in any closed loop
of a network is always.
Zero
34
The concept on which
Superposition theorem is based is.
Linearity
35
If the load in the given circuit
is 120 k-ohms, what is the loaded
output voltage?
15.79 V
36
With 21 V applied, if R1 = 5
ohms, R2 = 35 ohms, and R3 = 14
ohms, what is the current of R2 if
R1 is series connected with
parallel circuit R2 and R3?
400 mA
37
What is the total resistance of
a circuit when R1 (7 k ) is in
series with a parallel combination
of R2 (20 k ), R3 (36 k ), and
R4 (45 k )?
17 k-ohms
38
What is the total resistance?
3.2 k
39
If doubling the voltage across a
resistor doubles the current
through the resistor then
the resistor value did not change
40
What is the power in the given
circuit?
35 W
41
If voltage across a resistance
doubles.
none of the above
42
Intrinsic semiconductor
material is characterized by a
valence shell of how many
electrons?
4
43
What causes the depletion
region?
diffusion
44
What can a semiconductor sense?
all of the above
45
The primary function of the bias
circuit is to
hold the circuit stable at the designed Q-point
46
A JFET is a ______.
is a voltage-controlled device
47
D-MOSFETs are sometimes used in
series to construct a cascode highfrequency amplifier to overcome the
loss of:
high input impedance
48
When an input signal reduces the
channel size, the process is
called:
depletion
49
Two capacitors of 1 μF and 2 μF
capacitance are connected in
parallel across a 30 V dc battery.
After the capacitors have been
charged, the charges across the two
capacitors will be.
30 μC and 60 μC respectively
50
If the diameter of a wire is
doubled, the current carrying
capacity of the wire becomes
four times
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100問 • 1年前問題一覧
1
If a resistance to which a constant
voltage is applied is halved, what
power dissipation will result?
Doubled
2
If the reference point is changed
to the earth point then any voltage
taken w.r.t. the earth is known as
Absolute potential
3
Two ac sources feed a common
variable resistive load as shown in
figure. Under the maximum power
transfer condition, what is the
power absorbed by the load
resistance RL?
625 W
4
In a parallel circuit, the
individual branch currents are
inversely proportional to the branch resistance values
5
When a material becomes a
superconductor, its resistivity
becomes
zero
6
Delta to wye or wye to delta
transformation technique is
applied to a ______ network.
three-terminal
7
A straight conductor 500 mm long is
moved with constant velocity at
right angles both to its length and
to a uniform magnetic field. Given
that the e.m.f. induced in the
conductor is 2.5 V and the velocity
is 5 m/s, calculate the flux
density of the magnetic field. If
the conductor forms part of a
closed circuit of total resistance
5 ohms, calculate the force on the
conductor.
0.25N
8
A current of 6 A flows for 10
minutes. What charge is
transferred?
3600 C
9
The magnetic field due to a
current-carrying conductor takes
form of:
concentric circles
10
Voltage drop is the:
difference in potential between 2 points
11
The effect on an air gap in a
magnetic circuit is to:
increase the reluctance
12
A strong permanent magnet is
plunged into a coil and left in the
coil. What is the effect produced
on the coil after a short time?
There is no effect
13
An RLC series circuit is
underdamped. To make it overdamped,
the value of R
has to be increased
14
The drift velocity of electrons
is
very small as compared to speed of light
15
Calculate the resistivity of ntype semiconductor from the
following data, Density of holes =
5 x 1012 cm-3. Density of electrons
= 8 x 1013 cm-3, mobility of
conduction electron = 2.3 x 104 cm2/
V-sec and mobility of holes = 100
cm2/V-sec
0.34 Ω-m
16
Assertion (A): Two transistors
one n-p-n and the other p-n-p are
identical in all respects (doping,
construction, shape, size). The np-n transistor will have better
frequency response.
Reason (R): The electron mobility
is higher than hole mobility.
Both A and R are true and R is correct explanation of A
17
From the given circuit below, we
can conclude that.
transistor is faulty
18
In an ideal op-amp, which is not
true?
CMRR is zero
19
What is the use of the
compensation capacitor in op-amp?
Decreases the slew rate of op-amp
20
In a low pass filter as below,
find the cut-off frequency for the
following circuit.
636 Hz
21
Ripple factor of bridge full
wave rectifier is _________.
0.482
22
If peak voltage on a bridge full
wave rectifier circuit is 5V and
diode cut-in voltage is 0.7, then
peak inverse voltage on diode will
be _________.
4.3V
23
For a base current of 10 μA, what
is the value of collector current
in common emitter if βdc = 100
1 mA
24
Which of the following
oscillators is suitable for
frequencies in the range of
megahertz?
Hartley
25
Figure is a 24 Vr stabilized
power supply. The zener is 24 V,
600 mW. The minimum zener current
is 10 mA. Proper values R and
maximum load current are
320 Ω, 15 mA
26
In a class C power amplifier the
input signal has a frequency of 250kHz. If the collector current
pulses are 0.1 μs wide, the duty
cycle of current waveform is
2.5%
27
In figure, voltage across R2 = +
10 V. If VBE = 0.7 V and VE = 0.7
V and RE = 10 kΩ, current through
RE is
0.93 mA
28
The main advantage of CMOS
circuit is
low power consumption
29
Assertion (A): In design of
circuit using BJT, a derating
factor is used.
Reason (R): As the ambient
temperature increases, heat
dissipation becomes slower.
Both A and R are true and R is correct explanation of A
30
As temperature increases the
number of free electrons and holes
in an intrinsic semiconductor
increases
31
A conductor is said to have
resistance of one ohm if a
potential difference of one volt
across its terminals causes a
current of X ampere to flow through
it. What will be the value of X?
1
32
A 25 Ω resistor has a voltage
of 150 sin377 t. Find the
corresponding power.
900 sin² 337 t
33
According to Kirchhoff’s voltage
law, the algebraic sum of all IR
drops and e.m.f. in any closed loop
of a network is always.
Zero
34
The concept on which
Superposition theorem is based is.
Linearity
35
If the load in the given circuit
is 120 k-ohms, what is the loaded
output voltage?
15.79 V
36
With 21 V applied, if R1 = 5
ohms, R2 = 35 ohms, and R3 = 14
ohms, what is the current of R2 if
R1 is series connected with
parallel circuit R2 and R3?
400 mA
37
What is the total resistance of
a circuit when R1 (7 k ) is in
series with a parallel combination
of R2 (20 k ), R3 (36 k ), and
R4 (45 k )?
17 k-ohms
38
What is the total resistance?
3.2 k
39
If doubling the voltage across a
resistor doubles the current
through the resistor then
the resistor value did not change
40
What is the power in the given
circuit?
35 W
41
If voltage across a resistance
doubles.
none of the above
42
Intrinsic semiconductor
material is characterized by a
valence shell of how many
electrons?
4
43
What causes the depletion
region?
diffusion
44
What can a semiconductor sense?
all of the above
45
The primary function of the bias
circuit is to
hold the circuit stable at the designed Q-point
46
A JFET is a ______.
is a voltage-controlled device
47
D-MOSFETs are sometimes used in
series to construct a cascode highfrequency amplifier to overcome the
loss of:
high input impedance
48
When an input signal reduces the
channel size, the process is
called:
depletion
49
Two capacitors of 1 μF and 2 μF
capacitance are connected in
parallel across a 30 V dc battery.
After the capacitors have been
charged, the charges across the two
capacitors will be.
30 μC and 60 μC respectively
50
If the diameter of a wire is
doubled, the current carrying
capacity of the wire becomes
four times