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Q1. | The auto correlation of a sampling function is a |

A. | triangular function [Wrong Answer] |

B. | gate function [Correct Answer] |

C. | signum function [Wrong Answer] |

D. | none of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Out of the three transforms viz. Z-transform, Laplace transform and Fourier transform

all three are used in continuous time domain

all three are used in both continuous time domain and discrete time domain

Z transform is used in continuous time domain while Laplace and Fourier transforms are used in discrete time domain

Z transform is used is discrete time domain while Laplace and Fourier transforms are used in continuous time domain

⇒ The equivalent circuit of an ideal diode is

a charging condenser

a discharging condenser

a switch

a resistor

⇒ Which of the following is true for RC impedance?

The lowest critical frequency is a pole

The lowest critical frequency is zero

The lowest critical frequency may be pole or zero

The lowest critical frequency is a pole but cannot be at

*s*= 0

⇒ A dc machine has 6 poles all connected in series. Each pole has 9 H inductance and field current is 2 A. Total inductance and total energy stored are

9 H and 18 J

18 H and 36 J

54 H and 108 J

108 H and 216 J

⇒ The chip 8259 is a

programmable interrupt controller

programmable peripheral interface

I/O device

memory chip

⇒

*e*

^{-2t}is __________ .

energy signal

power signal

neither energy signal nor power signal

both energy and power signal

⇒ In a series RLC circuit excited by

*e*= E

_{m}sin ω

*t*is seen that LC < 1/ω

^{2}. Then

I lags E

I leads E

I leads E are in phase

voltage across L and C are equal

⇒ Resistivity of copper is lower than that of nickel. When a small percentage of copper is added to nickel, the resistivity

increases

decreases

may increase or decrease

remains the same

⇒ For high frequencies a capacitor like

an open circuit

a short circuit

either open circuit or short circuit

none of the above

⇒ The relation between thermal conductivity K (W/m/°C), heat flow density Q (watt/m

^{2}) and

*d*T/

*dx*(°C per metre) is

Q = K(

*d*T/

*dx*)

Q = - K(

*d*T/

*dx*)

K = Q(

*d*T/

*dx*)

*d*T/

*dx*= - QK

⇒ The resistivity of a semiconductor

increases as the temperature increases

decreases as the temperature increases

remains constant even when temperature varies

none of the above

⇒ The quiescent collector current I

_{C}, and collector to emitter voltage V

_{CE}in a CE connection are the values when

ac signal is zero

ac signal is low

ac signal is negative

either (a) or (b)

⇒ When a line short circuited at far end, the minimum voltage occurs at

far end

source end

midway between source and far end

none of the above

⇒ ALU carries out

arithmetic operations

logic operations

both arithmetic and logic operations

none of the above

⇒ The current through a resistance

*R*is shown in figure. The computed value of power

400 ± 0.42 W

400 ± 4.6 W

400 ± 8.85 W

400 ± 10.65 W

⇒ For a transfer function the coefficients of the numerator and denominator polynomials in s must be real.

TRUE

FALSE

⇒ Narrowband FM signal can be considered to be equal to

PM

AM

SSB

DSB

⇒ In the Taylor series expansion of exp(

*x*) + sin(

*x*) about the point

*x*= p, the coefficient of (

*x*- p)

^{2}is

exp (p)

0.5 exp (p)

exp (p) + 1

exp (p) - 1

⇒ A proportional controller is basically

an amplifier with adjustable gain

an integrating amplifier

an amplifier with infinite gain

an amplifier with almost zero gain

⇒ Which of the following is the main difference between waveguide and transmission line?

Waveguides cannot be coupled to coaxial lines

Waveguides have no standing wave ratio

Transmission line does not suffer from the effect of low cut off frequency

Waveguides are not distributed like transmission lines

⇒ If

*t*is the pulse width, Δ

_{p}*is the propagation delay,*

_{t}*T*is period of pulse train then the following condition can avoid the race around condition

*t*= Δ

_{p}*t*= T

2

*t*> Δ

_{p}*t*> T

*t*< Δ

_{p}*t*< T

*t*< Δ

_{p}*t*< T

⇒ In synchronous detection of an AM signal

Carrier is completely suppressed

Both side hands are suppressed

Only one side band and part of carrier is suppressed

One side band and full carrier is suppressed

⇒ In a microprocessor the clock signal

is always generated internally

is always supplied externally

may be generated internally or supplied externally

is mostly supplied externally

⇒ Which of the following flip-flop do not have race problem?

T flip-flop

D flip-flop

JK flip-flop

Master-slave flip-flop

⇒ A two branch parallel tuned circuit has a coil of resistance 100 Ω and inductance 0.005 H in one branch and 10

*n*F capacitor in the second branch. At resonance frequency is

100 rad/sec

10000 rad/sec

1000 rad/sec

more than 10000 rad/sec

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | Television | 1. | Either AM or FM used |

B. | Radio | 2. | Both AM and FM are used |

C. | Radar | 3. | PCM is used |

D. | Data Communication | 4. | Digital system |

A-4, B-3, C-1, D-2

A-2, B-1, C-3, D-4

A-4, B-1, C-3, D-2

A-2, B-3, C-1, D-4

⇒ Nyquist stability criterion is based on a theorem from the theory of complex variables.

TRUE

FALSE

⇒ The terminals of a power BJT are called

emitter, base, collector

emitter, base, drain

source, base, drain

source, base, collector

⇒ The radiation pattern of loop antenna is

circle

semicircle

elliptical

cardoid or Limacon

⇒

Match the following:

List I (Electron spin) | List II (Phenomenon) | ||
---|---|---|---|

A. | ↑↑↑↑ | 1. | Antiferromagnetism |

B. | ↑↓↑↓ | 2. | Ferrimagnetism |

C. | ↑↓↑↓ | 3. | Ferromagnetism |

A-1, B-2, C-3

A-3, B-2, C-1

A-2, B-3, C-1

A-3, B-1, C-2