Q1. | In a second order system, the time constant t of exponential envelopes depends |

A. | only on damping factor [Wrong Answer] |

B. | only on natural frequency [Wrong Answer] |

C. | both on damping factor and natural frequency [Correct Answer] |

D. | neither on damping factor nor on natural frequency [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ If

*f*

_{1}and

*f*

_{2}and half-power frequency and

*f*

_{0}be resonant frequency, the selectivity of R-L-C series circuit is given by

(

*f*

_{2}-

*f*

_{1})/2

*f*

_{0}

(

*f*

_{2}-

*f*

_{1})/

*f*

_{0}

(

*f*

_{2}-

*f*

_{0})/(

*f*

_{1}-

*f*

_{0})

(

*f*

_{2}-

*f*

_{1})/(

*f*

_{1}-

*f*

_{0})

⇒

Match the following:

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

A. | FM | 1. | slope-overload |

B. | DM | 2. | μ law |

C. | PSK | 3. | Envelope detector |

D. | PCM | 4. | Capture effect |

5. | Hilbert transform | ||

6. | Matched filter. |

A-5, B-1, C-6, D-4

A-4, B-6, C-1, D-5

A-4, B-1, C-6, D-2

A-6, B-3, C-4, D-2

⇒ The signumm function written as [

*sgn(*] is defined as

*t*)*sgn(t)*= - 1 for

*t*< 0, = 0 for

*t*= 0 and = 1 for

*t*> 0

*sgn(t)*= 1 for

*t*< 0, = 0 for

*t*= 0 and = - 1 for

*t*> 0

*sgn(t)*= 0 for

*t*< 0, = 1 for

*t*= 0 and = 0 for

*t*> 0

*sgn(t)*= 0 for

*t*< 0, = 1 for

*t*

^{3}0

⇒ What is the necessary a.c. input power from the transformer secondary used in a half wave rectifier to deliver 500 W of d.c. power to the load?

1232 W

848 W

616 W

308 W

⇒ In the above case the total power in the modulated wave double sideband, suppressed carrier AM will be

112 W

400 W

415 W

512 W

⇒ In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is

p - a

p

p + a

p - 2a

⇒

**Assertion (A):** The output voltage of an inverter can be controlled by PWM technique

**Reason (R):** In a current source inverter the input current is constant.

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ An RC impadence function has a pole at

*s*= 0. The first element in the Foster form of synthesis

is R

may be R and C

is C

is R and C in parallel

⇒ Periodic recharging of the memory cells at regular intervals of 3 to 8 millisecond is required in a

ROM

Static RAM

Dynamic RAM

PLA

⇒ In the expression

*b*= 2.1 / 1.2 * 3.1 + 3 / 7.1 * 6 which operation would have the first priority in C?

2.1 / 1.2

1.2 * 3.1

2.1 / 1.2 * 3.1

3 / 7.1

⇒ The nodal method of circuit analysis is based on

KVLs, ohm law

KCLs, ohm law

KCLs, KVL

KCL, KVL, ohms law

⇒ When a current carrying conductor is brought into magnetic field, the force that moves the conductor depends upon

the value of current

the weight of the conductor

the direction of the conductor

none of the above

⇒ Which class of amplifiers operates with least distortion?

Class A

Class B

Class C

Class AB

⇒ A constant

*k*high pass p section has a characteristic impedance of 300 Ω at

*f*= ∞ . At

*f*=

*f*

_{c}, the characteristic impedance will be

zero

∞

300 Ω

more than 300 Ω

⇒ For the infix expression (A/B) * (C * F + (A - D) * E) the corresponding Post fix notation is

A / D * CF AD - F * +

AB / CF * AD - E * + *

AB / C * FAD - E * + *

None of the above

⇒ In figure, D

_{2}turns on

*v*

_{i}is more positive than V

_{1}

*v*

_{i}is less positive than V

_{1}

*v*

_{i}is more negative than V

_{2}

*v*

_{i}is less negative than V

_{2}

⇒ If the intrinsic resistivity at 300°K is 0.37

*ohm-m*and the electron and hole mobilities at 300°K are 0.28 and 0.15

*m*

^{2}/volt-sec, then the intrinsic carrier concentration of Germanium is __________ .

2.92 x 10

^{19}/

*m*

^{3}

2.92 x 10

^{-19}/

*m*

^{3}

1.92 x 10

^{19}/

*m*

^{3}

3.92 x 10

^{19}/

*m*

^{3}

⇒ The phase velocity of an EM wave propagating in a hollow metallic rectangular waveguide in the TE

_{10}mode is

equal to its group velocity

less than the velocity of light in free space

equal to the velocity of light in free space

greater than the velocity of light in free space

⇒ The resistance of a standard conductor.

increases with frequency

same for

*ac*and

*dc*

increases with frequency

increases as square root of frequency

⇒

**Assertion (A):** In an *n*-*p*-*n* transistor as the electrons enter the collector region, they are accelerated towards the collector terminal.

**Reason (R):** Emitter base junction in BJT is forward biased.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

⇒ Consider the following in C

- An arithmetic operation between integer and an integer gives integer as the result.
- An arithmetic operation between a real and a real constant gives real constant as the result.
- An arithmetic operation between an integer constant and a real constant is not valid.

All

1 and 2 only

2 and 3 only

1 and 3 only

⇒ Armoured submarine cable is used

to prevent insulation breakdown due to high voltage

to protect cable at great depths.

to prevent inadverent damage due to ploughing in

for the shallow shore ends of cable.

⇒

**Assertion (A):** The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fir

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ A push pull amplifier is a

power amplifier

voltage amplifier

current amplifier

both power and current amplifier

⇒ In a Hurwitz polynomial

all coefficients are non-negative

the coefficients may be positive or negative

all coefficients are negative

all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis

⇒ Radar principle is used in

detection of aircraft

burglar alarms

garage door openers

all of the above

⇒ Complex pole in z-plane is as shown below. This is the pole diagram for ________

Decaying sinusoidal sequence

Growing sinusoidal sequence

Decaying non sinusoidal sequence

Growing non sinusoidal sequence

⇒ Which of the following is known as insulated gate FET?

JFET

MOSFET

Both JFET and MOSFET

None of the above

⇒ The integral of unit step function is a ramp of slope unity.

TRUE

FALSE

⇒ When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

source, sink

sink, source

positive value, negative value

negative value, positive value