Q.1

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.2

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.3

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.4

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.5

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

  • uphold
  • restrain
  • Cherish
  • conserve
Q.6


ωL =

  • 108 rad/sec
  • 104 rad/sec
  • 102 rad/sec
  • 10 rad/sec
Q.7

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

  • 4
  • 11
  • none of these
  • not possible
Q.8

Find Y- parameters

  • None of these
Q.9

Find Y- parameters

  • None of these
Q.10

Find Y- parameters

  • None of these
Q.11

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

  • 10 GHz
  • 1 GHz
  • 15 GHz
  • 25 GHz
Q.12

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.13

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.14

A MOSFET has a threshold voltage of 1 V and oxide thickness ofx 10-8 [εr = 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
Q.15

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.16

A radar receiver has a noise figure ofdB atK having a bandwidth of 2.5 MHz. The minimum power it can receive is

  • 3.45 x 10-15 W
  • 1.38 x 10-15 W
  • 7.5 x 10-15 W
  • 93.15 x 10-15 W
Q.17

What is the propagation constant for air filled wave guide with dimensions a = 1.and b = 0.at 4.GHz?

  • 0.6698
  • 0.7698
  • 0.503
  • 0.6598
Q.18

A discrete time linear shift-invariant system has an impulse response h[n] with h[=h[= -h[-and zero otherwise. The system is given an input sequence x[n] with x[- x[-and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[are, respectively

  • 5, 2
  • 6, 2
  • 6, 1
  • 5, 3
Q.19

A radar receiver has a noise figure ofdB atK having a bandwidth of 2.5 MHz. The minimum power it can receive is

  • 3.45 x 10-15 W
  • 1.38 x 10-15 W
  • 7.5 x 10-15 W
  • 93.15 x 10-15 W
Q.20

Find Y- parameters

  • None of these
Q.21

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.22


ωL =

  • 108 rad/sec
  • 104 rad/sec
  • 102 rad/sec
  • 10 rad/sec
Q.23

What is the propagation constant for air filled wave guide with dimensions a = 1.and b = 0.at 4.GHz?

  • 0.6698
  • 0.7698
  • 0.503
  • 0.6598
Q.24

A radar receiver has a noise figure ofdB atK having a bandwidth of 2.5 MHz. The minimum power it can receive is

  • 3.45 x 10-15 W
  • 1.38 x 10-15 W
  • 7.5 x 10-15 W
  • 93.15 x 10-15 W
Q.25

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.26

The truth table corresponding to the given input digital gate :

Q.27

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.28

What is the propagation constant for air filled wave guide with dimensions a = 1.and b = 0.at 4.GHz?

  • 0.6698
  • 0.7698
  • 0.503
  • 0.6598
Q.29

A discrete time linear shift-invariant system has an impulse response h[n] with h[=h[= -h[-and zero otherwise. The system is given an input sequence x[n] with x[- x[-and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[are, respectively

  • 5, 2
  • 6, 2
  • 6, 1
  • 5, 3
Q.30

A discrete time linear shift-invariant system has an impulse response h[n] with h[=h[= -h[-and zero otherwise. The system is given an input sequence x[n] with x[- x[-and zero otherwise. The number of nonzero samples in the output sequence y[n], and the value of y[are, respectively

  • 5, 2
  • 6, 2
  • 6, 1
  • 5, 3
Q.31

The truth table corresponding to the given input digital gate :

Q.32

The truth table corresponding to the given input digital gate :

Q.33

If A = then |A50| will be

  • (1 - 1002)
  • (1 - 502)
  • (1 - 1002)
  • (1 - 502)
Q.34

If A = then |A50| will be

  • (1 - 1002)
  • (1 - 502)
  • (1 - 1002)
  • (1 - 502)
Q.35

If A = then |A50| will be

  • (1 - 1002)
  • (1 - 502)
  • (1 - 1002)
  • (1 - 502)
Q.36

A bipolar differential amplifier uses a transistor having β0 =ICQ =mA, |Adm| =and CMRR =dB. The value of Rc and RE will be respectively __________ .

  • 1.25 kΩ, 1.25 MΩ
  • 125 kΩ, 1.25 MΩ
  • 1.25 MΩ, 1.25 kΩ
  • 3.25 kΩ, 3.25 MΩ
Q.37

For a given magnetic material operating in linear mode B = 0.T. Assume permeability =then magnetization is:

  • 44836 A/m
  • 46834 A/m
  • 946 A/m
  • 936 A/m
Q.38

A bipolar differential amplifier uses a transistor having β0 =ICQ =mA, |Adm| =and CMRR =dB. The value of Rc and RE will be respectively __________ .

  • 1.25 kΩ, 1.25 MΩ
  • 125 kΩ, 1.25 MΩ
  • 1.25 MΩ, 1.25 kΩ
  • 3.25 kΩ, 3.25 MΩ
Q.39

A bipolar differential amplifier uses a transistor having β0 =ICQ =mA, |Adm| =and CMRR =dB. The value of Rc and RE will be respectively __________ .

  • 1.25 kΩ, 1.25 MΩ
  • 125 kΩ, 1.25 MΩ
  • 1.25 MΩ, 1.25 kΩ
  • 3.25 kΩ, 3.25 MΩ
Q.40

For a given magnetic material operating in linear mode B = 0.T. Assume permeability =then magnetization is:

  • 44836 A/m
  • 46834 A/m
  • 946 A/m
  • 936 A/m
Q.41

A bipolar differential amplifier uses a transistor having β0 =ICQ =mA, |Adm| =and CMRR =dB. The value of Rc and RE will be respectively __________ .

  • 1.25 kΩ, 1.25 MΩ
  • 125 kΩ, 1.25 MΩ
  • 1.25 MΩ, 1.25 kΩ
  • 3.25 kΩ, 3.25 MΩ
Q.42

For a given magnetic material operating in linear mode B = 0.T. Assume permeability =then magnetization is:

  • 44836 A/m
  • 46834 A/m
  • 946 A/m
  • 936 A/m
Q.43

Consider the transmission line of length 37.5 cm, which is terminated into zero resistance. This line is being exited by a source of 1 GHz which has an internal impedance ofΩ. What is the input impedance of the line as seen by the source?

  • 50 Ω
  • Zero Ω
  • 100 Ω
  • Infinite Ω
Q.44

The voltage applied to an R-L circuit at t = 0 when switch is closed iscos (t + 30°). The circuit resistance isΩ and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

  • 1 A
  • 2 A
  • 5 A
  • 10 A
Q.45

The effective length of an 1/2 antenna (Given Rr =Ω and (Ae)max = 0.34λ2 and η = 120p) is __________ .

  • 0.6348 λ
  • 0.5133 λ
  • 0.1587 λ
  • 0.3714 λ
Q.46

The two numbers represent in signed 2's complement form are P =and Q =If Q subtracted from P, the value obtained in signed 2's complement form is

  • 100000111
  • 00000111
  • 11111001
  • 111111001
Q.47

A generator ofΩ internal impedance and operating at 1 GHz feeds aΩ load via a coaxial line of characteristic impedanceΩ. The VSWR on the feed line is

  • 0.5
  • 1.5
  • 2.5
  • 1.75
Q.48

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.49

The Nyquist sampling rate for the signal s(t) = is given by

  • 400 Hz
  • 600 Hz
  • 1200 Hz
  • 1400 Hz
Q.50

A generator ofΩ internal impedance and operating at 1 GHz feeds aΩ load via a coaxial line of characteristic impedanceΩ. The VSWR on the feed line is

  • 0.5
  • 1.5
  • 2.5
  • 1.75
0 h : 0 m : 1 s