Q.1

A TV picture is to be transmitted over a channel of 6 MHz bandwidth at adB S/N ratio. The capacity of the channel is

  • 50 Mbps
  • 100 Mbps
  • 36 Mbps
  • 72 Mbps
Q.2

As the temperature increases the mobility of electrons __________ .

  • decreases because the number of carries increases with increased collisions
  • increases because the number of carries decreases with decreased collisions
  • remains same
  • none of the above
Q.3

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.4

Find Vx Vy Vz

  • Vx = -6 Vy = 3 Vz = -3
  • Vx = -6 Vy = -3 Vz = 1
  • Vx = 6 Vy = 3 Vz = 3
  • Vx = 6 Vy = 1 Vz = 3
Q.5

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  • 1.5 x 108 m/s
  • 5.5 x 108 m/s
  • 3.46 x 108 m/s
  • 0.18 x 107 m/s
Q.6

A TV picture is to be transmitted over a channel of 6 MHz bandwidth at adB S/N ratio. The capacity of the channel is

  • 50 Mbps
  • 100 Mbps
  • 36 Mbps
  • 72 Mbps
Q.7

As the temperature increases the mobility of electrons __________ .

  • decreases because the number of carries increases with increased collisions
  • increases because the number of carries decreases with decreased collisions
  • remains same
  • none of the above
Q.8

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.9

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.10

In a 4 bit weighted resistor D/A converter, the resistor value corresponding to LSB iskΩ. The resistor value corresponding to MSB will be

  • 32 KΩ
  • 16 KΩ
  • 8 KΩ
  • 4 KΩ
Q.11

In a 4 bit weighted resistor D/A converter, the resistor value corresponding to LSB iskΩ. The resistor value corresponding to MSB will be

  • 32 KΩ
  • 16 KΩ
  • 8 KΩ
  • 4 KΩ
Q.12

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE10 mode is

  • 1.5 x 108 m/s
  • 5.5 x 108 m/s
  • 3.46 x 108 m/s
  • 0.18 x 107 m/s
Q.13

The analog signal given below is sampled atsamples per second. m(t) = 2 sinpt + 3 sinpt + 4 sinpt + 5 sinpt + 6 sinpt + 7 sinpt. The folding (maximum) frequency is __________ .

  • 300 Hz
  • 360 Hz
  • 600 Hz
  • 480 Hz
Q.14

Find Vx Vy Vz

  • Vx = -6 Vy = 3 Vz = -3
  • Vx = -6 Vy = -3 Vz = 1
  • Vx = 6 Vy = 3 Vz = 3
  • Vx = 6 Vy = 1 Vz = 3
Q.15

The star equivalent C1 C2, C3 of the delta network is respectively

Q.16

For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is

  • 2
  • 1
  • 0.5
  • 0
Q.17

Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.

Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are 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.18

The value of the integral is

Q.19

An antisymmetric filter having odd number of coefficient may have a performance as

  • low pass
  • high pass
  • band pass
  • all pass
Q.20

The star equivalent C1 C2, C3 of the delta network is respectively

Q.21

For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is

  • 2
  • 1
  • 0.5
  • 0
Q.22

Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.

Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are 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.23

The star equivalent C1 C2, C3 of the delta network is respectively

Q.24

For real values of x, the minimum value of the function f(x) exp (x) + exp (- x) is

  • 2
  • 1
  • 0.5
  • 0
Q.25

Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.

Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.

  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are 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.26

An antisymmetric filter having odd number of coefficient may have a performance as

  • low pass
  • high pass
  • band pass
  • all pass
Q.27

The value of the integral is

Q.28

The star equivalent C1 C2, C3 of the delta network is respectively

Q.29

The value of the integral is

Q.30

A material has conductivity of 105 mho/m and permeability of 4p x 10-7 H/m. The skin depth at 9 GHz is

  • 1.678 μm
  • 26 μm
  • 17 μm
  • 32.32 μm
Q.31

If a signal f(t) has energy E, the energy of the signal f(2t) is equal to __________ .

  • E
  • E/2
  • E/4
  • 2E
Q.32

An image usesxpicture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be

  • 2097152 bits
  • 648 bits
  • 786432 bits
  • 144 bits
Q.33

A tachometer has a sensitivity of 4 V/rpm. Express the gain constant of the tachometer in the units volts/(rad/sec).

  • 0.0489
  • 0.0381
  • 2
  • none of these
Q.34

For a npn BJT transistor fβ is 1.x 108 Hz. Cμ = 10-14 F; Cp = 4 x 10-13 F and DC current gain isFind fT and gm (fβ = cut off frequency, Cμ = capacitance, Cp = parasitic capacitance, gm = transconductance, fT = gain BW product)

  • fT = 1.47 x 1010 Hz ; gm = 38 milli mho
  • fT = 1.64 x 108 Hz ; gm = 30 milli mho
  • fT = 1.47 x 109 Hz ; gm = 38 mho
  • fT = 1.33 x 1012 Hz; gm = 0.37 m-mho
Q.35

The impulse response h(t) of a linear time-invariant continuous time system is described by h(t) = exp (at) u(t) + exp (βt) u (- t), where u(t) denotes the unit step function, and a and β are constants. This system is stable if

  • a is positive and β is positive
  • a is negative and β is negative
  • a is positive and β is negative
  • a is negative and β is positive
Q.36

A certain system has transfer function a is a parameter. Consider the standard negative unity feedback configuration as shown below.

Which of the following statements is true?

  • The closed loop system in never stable for any value of a a
  • For some positive values of a, the closed loop system is stable, but not for all positive values
  • For all positive values of a, the closed loop system is stable
  • The closed loop system is stable for all values of a, both positive and negative
Q.37

For a series resonant circuit at low frequency circuit impedance is __________ and at high frequency circuit impedance is __________
Fill in the blanks respectively

  • capacitive, inductive
  • inductive, capacitive
  • resistive, inductive
  • capacitive, resistive
Q.38

The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5pn) x2(n) = 3 sin (5pn) is __________ .

  • 2
  • 3
  • 4
  • 1
Q.39

In a semiconductor material. The hole concentration is found to be 2 x 2.5 x 1015 cm-3. If mobility of carriers is 0.m2/ v-s. Then find the current density if electric field intensity is 3.x 10-19

  • 7.6237 x 10-4 A/cm2
  • 7.6237 x 10-5 A/cm2
  • 7.6237 x 10-3 A/cm2
  • none of these
Q.40

If we manage to __________ our natural resources, we would leave a better planet for our children.

  • uphold
  • restrain
  • Cherish
  • conserve
Q.41

A transmission line has a characteristic impedance ofΩ and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

  • 500
  • 5
  • 0.014
  • 0.002
Q.42


ωL =

  • 108 rad/sec
  • 104 rad/sec
  • 102 rad/sec
  • 10 rad/sec
Q.43

(2)3 + (3)4 = (?)5

  • 4
  • 11
  • none of these
  • not possible
Q.44

Find Y- parameters

  • None of these
Q.45

Find Y- parameters

  • None of these
Q.46

Find Y- parameters

  • None of these
Q.47

A rectangular waveguide, in dominant TE mode, has dimensionscm xcm. The cut off frequency is

  • 10 GHz
  • 1 GHz
  • 15 GHz
  • 25 GHz
Q.48

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

  • 62831.9 V/sec
  • 125663.8 V/sec
  • 31415.95 V/sec
  • None
Q.49

A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .

  • - 2 V
  • 2 V
  • - 4 V
  • 4 V
Q.50

A MOSFET has a threshold voltage of 1 V and oxide thickness ofx 10-8r = 3.ε0 = 8.x 10-14 F/cm, q = 1.6 x 10-19 c]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to - 1 V are __________ .

  • 8.6 x 1011/cm2, p-type
  • 8.6 x 1011/cm2, n-type
  • 0.86 x 109/cm2, p-type
  • 1.02 x 1012/cm2, n-type
0 h : 0 m : 1 s