Q.1

A MOD - 2 counter, the FF has a tpd =nsec. The NOR gate has a tpd ofnsec. The clock frequency is

  • 37 MHz
  • 40 MHz
  • 111 MHz
  • none
Q.2

The current i(t), though aΩ resistor in series with an inductance, is given by i(t) = 3 + 4 sin (10t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are

  • 41 A, 410 W, respectively
  • 35 A, 350 W, respectively
  • 5 A, 250 W, respectively
  • 11 A, 1210 W, respectively
Q.3

The magnitude plot of a composite signal x(t) = e2jt + e3jt is

  • Half wave rectified sinusoid
  • Full wave rectified sinusoid
  • Exponentially increasing sinusoid
  • Exponentially decreasing sinusoid
Q.4

Consider the frequency modulated signalcos (2p x 105t + 5 sin (2p x 1500t) + 7.5 sin (2p x 1000t) with carrier frequency of 105Hz. The modulation index is

  • 12.5
  • 10
  • 7.5
  • 5
Q.5

A transmitter radiates a powerKW and its base current is 18A. The radiation resistance of the antenna is

  • 1111 Ω
  • 900 Ω
  • 75 Ω
  • 62 Ω
Q.6

Abit counter type ADC uses 1 MHz clock then its maximum conversion time is __________ .

  • 16 μs
  • 15 ms
  • 6.6 ms
  • 66 ms
Q.7

A first order system will never be able to give a __________ response.

  1. Band pass
  2. Band reject
  3. All pass
Choose the correct option
  • 1, 2 and 3 are true
  • 1 and 3 are true, 2 is false
  • 1 and 2 are false, 3 is true
  • 1 and 2 are true, 3 is false
Q.8

e-2t is __________ .

  • energy signal
  • power signal
  • neither energy signal nor power signal
  • both energy and power signal
Q.9

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.10

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.11

(11)2 + (11)3 = (11)?

  • 4
  • 5
  • 6
  • none
Q.12

Consider the frequency modulated signalcos (2p x 105t + 5 sin (2p x 1500t) + 7.5 sin (2p x 1000t) with carrier frequency of 105Hz. The modulation index is

  • 12.5
  • 10
  • 7.5
  • 5
Q.13

If the Laplace transform of the voltage transform of the voltage across a capacitor of value F is the value of the current through the capacitor at t = 0+ is

  • 0 A
    10-03-28-1.png
  • 2 A
    10-03-28-1.png
  • A
  • 1 A
Q.14

e-2t is __________ .

  • energy signal
  • power signal
  • neither energy signal nor power signal
  • both energy and power signal
Q.15

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.16

For a class B amplifier using a supply of VCC =V and driving a load ofΩ the maximum efficiency will be __________ .

  • 72.4%
  • 78.54%
  • 62.4%
  • 68.54%
Q.17

The energy of constant-amplitude complex valued exponential sequence is __________ (where A is the constant amplitude)

  • 0
  • 1
  • ∞
  • A2
Q.18

A short grounded vertical antenna has a length L which is 0.at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be

  • R/2Ω
  • RΩ
  • 2RΩ
  • 4RΩ
Q.19

Consider the frequency modulated signalcos (2p x 105t + 5 sin (2p x 1500t) + 7.5 sin (2p x 1000t) with carrier frequency of 105Hz. The modulation index is

  • 12.5
  • 10
  • 7.5
  • 5
Q.20

If the Laplace transform of the voltage transform of the voltage across a capacitor of value F is the value of the current through the capacitor at t = 0+ is

  • 0 A
    10-03-28-1.png
  • 2 A
    10-03-28-1.png
  • A
  • 1 A
Q.21

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.22

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.23

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.24

Consider the frequency modulated signalcos (2p x 105t + 5 sin (2p x 1500t) + 7.5 sin (2p x 1000t) with carrier frequency of 105Hz. The modulation index is

  • 12.5
  • 10
  • 7.5
  • 5
Q.25

An audio signal of FM radio station is sampled at a rate ofabove the Nyquist rate. Signal is sampled inlevels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

  • 77 K bits/sec
  • 92 K bits/sec
  • 84.8 K bits/sec
  • 82.8 K bits/sec
Q.26

If the Laplace transform of the voltage transform of the voltage across a capacitor of value F is the value of the current through the capacitor at t = 0+ is

  • 0 A
    10-03-28-1.png
  • 2 A
    10-03-28-1.png
  • A
  • 1 A
Q.27

e-2t is __________ .

  • energy signal
  • power signal
  • neither energy signal nor power signal
  • both energy and power signal
Q.28

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.29

A first order system will never be able to give a __________ response.

  1. Band pass
  2. Band reject
  3. All pass
Choose the correct option
  • 1, 2 and 3 are true
  • 1 and 3 are true, 2 is false
  • 1 and 2 are false, 3 is true
  • 1 and 2 are true, 3 is false
Q.30

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.31

Find resistance RB to bring transistor to threshold of saturation (VCB = 0), VBE = 0.7 V, a = 0.96

  • 1.5 KΩ
  • 15 KΩ
  • 10 KΩ
  • 1 KΩ
Q.32

A germanium diode has a reverse saturation current ofμA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.

  • 10.7 Ω, 70 kΩ
  • 34 Ω, 20 kΩ
  • 80 Ω, 20 kΩ
  • 800 Ω, 40 kΩ
Q.33

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.34

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.35

An audio signal of FM radio station is sampled at a rate ofabove the Nyquist rate. Signal is sampled inlevels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

  • 77 K bits/sec
  • 92 K bits/sec
  • 84.8 K bits/sec
  • 82.8 K bits/sec
Q.36

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.37

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.38

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.39

In the circuit shown, the device connected to Y5 can have address in the range

  • 2000 - 20FF
  • 2D00 - 2DFF
  • 2E00 - 2EFF
  • FD00 - FDFF
Q.40

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.41

The point P in the following figure is stock atThe output f will be

  • ABC
  • A
  • AB C
  • A
Q.42

In a microprocessor, the service routine for a certain interrupt starts from a fixed location of memory which cannot be externally set, but the interrupt can be delayed or rejected. Such an interrupt is

  • non-maskable and non-vectored
  • maskable and non-vectored
  • non-maskable and non-vectored
  • maskable and vectored
Q.43

Which of the following Boolean algebra rules is correct?

  • A . A = 1
  • A + AB = A + B
  • A + A B = A + B
  • A(A + B) = B
Q.44

Assertion (A): As the length of the resonant antenna is increased, the number of lobes increases and the direction of the major lobes is closer and closer to the direction of the diode.

Reason (R): As the length increases, the current distribution along the wire becomes more and more uniform.

  • 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.45

Separation property of state-transition matrix is

  • φ(t - t0) = φ(t) φ(t0)
  • φ(t - t0) = φ-1(t) φ-1(t0)
  • φ(t - t0) = φ(t) φ-1(t0)
  • φ(t - t0) = φ-1(t) φ-1(t0)
Q.46

Polarization is a measure of

  • dielectric constant per unit volume
  • voltage gradient to produce electrical breakdown
  • product of charge and distance
  • excess charge density
Q.47

Which of the following cannot provide as much time interval accuracy as the oscilloscope but can capture and display eight or more signals simultaneously, something that scopes cannot do?

  • Logic analyzer
  • Digital oscilloscope
  • Frequency analyzer
  • Wave analyzer
Q.48

A DC voltage source is connected across a series R - L - C circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

  • R only
  • C only
  • L only
  • R and L combination
Q.49

For the polynomial P(s) = s5 + s4 + 2s3 + 2s2 + 3s +The number of roots which lie in the right half of the s plane is :

  • 4
  • 2
  • 3
  • 1
Q.50

Noise with double-sided power spectral density of K overall frequencies is passed through a RC low pass filter with 3 dB cut-off frequency of fc. The noise power at the filter output is

  • K
  • Kfc
  • Kpfc
  • ∞
0 h : 0 m : 1 s