Q.1

Consider the following statements regarding the class-B power amplifiers (Complementary symmetry type):

  1. The efficiency of the amplifier is higher than that of class-A amplifier
  2. The power output is low
  3. Crossover distortion is present
  4. The standby power dissipation is absent.
Which of the above statements are correct?
  • 1, 2 and 3
  • 1, 2 and 4
  • 1, 3 and 4
  • 2, 3 and 4
Q.2

Which of the following capabilities are available in a Universal Shift Register?

  1. Shift left
  2. Shift right
  3. Parallel load
  4. Serial add
Select the correct answer from the codes given below:
  • 2 and 4 only
  • 1, 2 and 3
  • 1, 2 and 4
  • 1, 3 and 4
Q.3

Assertion (A): Cut-in voltage for Germanium diode is greater than that for silicon diode.

Reason (R): Germanium diode has a higher reverse saturation current than silicon diode.

  • Both A and R are individually true and R is the correct explanation of A
  • Both A and R are individually true but R is not the correct explanation of A
  • A is true but R is false
  • A is false but R is true
Q.4

Simplify : A + B + A B + (A + B)AB + C(B + AB)

  • B + A
  • C
  • C
  • 1
Q.5

Which one of the following is a regulated power supply?

  • IC 555
  • IC 844
  • IC 3080
  • IC 723
Q.6

Number of fundamental cut-sets of any graph will be

  • same as the number of twigs
  • same as the number of tree branches
  • same as the number of nodes
  • equal to one
Q.7

Consider a silicon p-n junction at room temperature having the following parameters:
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 μm
Depletion width on the p-side = 1.0 μm
Intrinsic carrier concentration = 1.4 x 1014F. cm-1.
Thermal voltage = 26mV
Permittivity of free space = 8.x 10-14F. cm-1.
Dielectric constant of silicon =A built in potential of the junction.

  • is 0.70V
  • is 0.76V
  • is 0.82V
  • cannot be estimated from the data given
Q.8

Consider the following statements:
For am long common power line connecting a switch to a light bulb

  1. It is a distributed circuit.
  2. Time delay for propagation through it is negligible.
  3. It is the form of a shielded coaxial cable of circular cross-section.
  4. As the intensity of the lamp varies, input impedance of this line also changes.
Which of the above statements is/are correct?
  • 1 only
  • 1 and 2
  • 2 and 3
  • 2 and 4
Q.9

A signal with ±V ranged and 1 KHz band width is being digitized using a sample and hold circuit and abit quantizer. The quantization step is :

  • 1 x 10-9 V
  • 5 x 10-9 V
  • 2.5 x 10-9 V
  • 0.5 x 10-9 V
Q.10

For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

  • 360°
  • 180°
  • 90°
  • 45°
Q.11

In a CMOS CS amplifier, the active load is obtained by connecting a

  • p channel current mirror circuit
  • n channel transistor
  • p channel transistor
  • BJT current mirror
Q.12

The number of distinct Boolean expressions of 3 variables is

  • 8
  • 256
  • 64
  • 7
Q.13

A 2 μF capacitor is shunted by a 1 kΩ maintained at temperatureK. The rms noise voltage across the capacitor over the entire frequency band is:

  • 6.25 x 10-8 V
  • 5.25 x 10-6 V
  • 6.25 x 10-6 V
  • 5.25 x 10-8 V
Q.14

If the open-loop transfer function is a ratio of a numerator polynomial of degree 'm' and a denominator polynomial of degree 'n', then the integer (n - m) represents the number of:

  • breakaway points
  • unstable poles
  • separate root loci
  • asymptotes
Q.15

If the open-loop transfer function is a ratio of a numerator polynomial of degree 'm' and a denominator polynomial of degree 'n', then the integer (n - m) represents the number of:

  • breakaway points
  • unstable poles
  • separate root loci
  • asymptotes
Q.16

The feedback control system shown in figure is stable.

  • for all K ≥ 0
  • only if K ≥ 1
  • only if 0 ≤ K < 1
  • only if -1 ≤ K < 1
Q.17

A parallel plate capacitor has surface density of rs C/m2. The dielectric inside capacitor is air. The electric field intensities outside and inside the capacitor are

Q.18

. The signal is __________ .

  • periodic for t > 0
  • non-periodic
  • periodic for t < 0
  • depends on t
Q.19

The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R =The combinational logic required to realize a modulocounter is

  • F= Q4 Q3 Q2 Q1
  • F= Q4 + Q3 + Q2 + Q1
  • F = Q4 + Q3 + Q2 + Q1
  • F = Q4 Q3 Q2 Q1
Q.20

The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R =The combinational logic required to realize a modulocounter is

  • F= Q4 Q3 Q2 Q1
  • F= Q4 + Q3 + Q2 + Q1
  • F = Q4 + Q3 + Q2 + Q1
  • F = Q4 Q3 Q2 Q1
Q.21

The magnitude plot of a composite signal x(t) = e3jt + e4jt is __________ .

  • Half wave rectified sinusoid
  • Full wave rectified sinusoid
  • Exponentially increasing sinusoid
  • Exponentially decreasing sinusoid
Q.22

A signal with ±V ranged and 1 KHz band width is being digitized using a sample and hold circuit and abit quantizer. The quantization step is :

  • 1 x 10-9 V
  • 5 x 10-9 V
  • 2.5 x 10-9 V
  • 0.5 x 10-9 V
Q.23

A signal with ±V ranged and 1 KHz band width is being digitized using a sample and hold circuit and abit quantizer. The quantization step is :

  • 1 x 10-9 V
  • 5 x 10-9 V
  • 2.5 x 10-9 V
  • 0.5 x 10-9 V
Q.24

VR at t < T, t = ∞

  • 500e-40x104t, 0
  • 100e-40x103t, 0
  • 100e-40x106t, 0
  • 100e-40x104t, 0
Q.25

The number of distinct Boolean expressions of 3 variables is

  • 8
  • 256
  • 64
  • 7
Q.26

Find current i.

  • 4/5 A
  • 5/4 A
  • 1.23 A
  • 1.32 A
Q.27

Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown in figure is

Q.28

In x = the value of x is

  • 10
  • 25
  • 36
  • 44
Q.29

Using 4-bit numbers (n =if k = 00112, how is k expressed in 2's complement?

  • 10112
  • 11012
  • 11002
  • 01012
Q.30

If the open-loop transfer function is a ratio of a numerator polynomial of degree 'm' and a denominator polynomial of degree 'n', then the integer (n - m) represents the number of:

  • breakaway points
  • unstable poles
  • separate root loci
  • asymptotes
Q.31

A parallel plate capacitor has surface density of rs C/m2. The dielectric inside capacitor is air. The electric field intensities outside and inside the capacitor are

Q.32

The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R =The combinational logic required to realize a modulocounter is

  • F= Q4 Q3 Q2 Q1
  • F= Q4 + Q3 + Q2 + Q1
  • F = Q4 + Q3 + Q2 + Q1
  • F = Q4 Q3 Q2 Q1
Q.33

The counter shown in figure is built using 4 negative edge triggered toggle FFs. The FFs can be set synchronously when R =The combinational logic required to realize a modulocounter is

  • F= Q4 Q3 Q2 Q1
  • F= Q4 + Q3 + Q2 + Q1
  • F = Q4 + Q3 + Q2 + Q1
  • F = Q4 Q3 Q2 Q1
Q.34

The magnitude plot of a composite signal x(t) = e3jt + e4jt is __________ .

  • Half wave rectified sinusoid
  • Full wave rectified sinusoid
  • Exponentially increasing sinusoid
  • Exponentially decreasing sinusoid
Q.35

A signal with ±V ranged and 1 KHz band width is being digitized using a sample and hold circuit and abit quantizer. The quantization step is :

  • 1 x 10-9 V
  • 5 x 10-9 V
  • 2.5 x 10-9 V
  • 0.5 x 10-9 V
Q.36

VR at t < T, t = ∞

  • 500e-40x104t, 0
  • 100e-40x103t, 0
  • 100e-40x106t, 0
  • 100e-40x104t, 0
Q.37

VR at t < T, t = ∞

  • 500e-40x104t, 0
  • 100e-40x103t, 0
  • 100e-40x106t, 0
  • 100e-40x104t, 0
Q.38

Find current i.

  • 4/5 A
  • 5/4 A
  • 1.23 A
  • 1.32 A
Q.39

Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown in figure is

Q.40

In x = the value of x is

  • 10
  • 25
  • 36
  • 44
Q.41

Assuming the OP-AMP to be ideal, the voltage gain of the amplifier shown in figure is

Q.42

When x(n) is real then the Fourier series coefficients are correlated as __________ .

  • a-k = ak*
  • ak = ak*
  • ak+1 = ak*
  • a-k+1 = ak*
Q.43

When x(n) is real then the Fourier series coefficients are correlated as __________ .

  • a-k = ak*
  • ak = ak*
  • ak+1 = ak*
  • a-k+1 = ak*
Q.44

In x = the value of x is

  • 10
  • 25
  • 36
  • 44
Q.45

Using 4-bit numbers (n =if k = 00112, how is k expressed in 2's complement?

  • 10112
  • 11012
  • 11002
  • 01012
Q.46

A parallel plate capacitor has surface density of rs C/m2. The dielectric inside capacitor is air. The electric field intensities outside and inside the capacitor are

Q.47

The Nyquist sampling interval, for the signal sine (700t) + sine (500t) is

Q.48

Which of the following capabilities are available in a Universal Shift Register?

  1. Shift left
  2. Shift right
  3. Parallel load
  4. Serial add
Select the correct answer from the codes given below:
  • 2 and 4 only
  • 1, 2 and 3
  • 1, 2 and 4
  • 1, 3 and 4
Q.49

The system which is unstable is __________ .

  • h(t) = RCt . e-1 u(t)
    2-755-30-1.png
    2-755-30-2.png
    2-755-30-3.png
Q.50

VR at t < T, t = ∞

  • 500e-40x104t, 0
  • 100e-40x103t, 0
  • 100e-40x106t, 0
  • 100e-40x104t, 0
0 h : 0 m : 1 s