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Q1. | A linear discrete time system has the char. equation z^{3} - 0.81z = 0, the system is |

A. | stable [Correct Answer] |

B. | marginally stable [Wrong Answer] |

C. | unstable [Wrong Answer] |

D. | stability cannot be assessed from the given information [Wrong Answer] |

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

⇒ For Bode plot of (1 +

*j*ωT) has

slope of 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of - 20 dB/decade and phase angle + tan

^{-1}(ωT)

slope of 20 dB/decade and phase angle - tan

^{-1}(ωT)

slope of - 40 dB/decade and phase angle - tan

^{-1}(ωT)

⇒ Two impedances 10 -

*j*10 and 10 +

*j*10 are connected in parallel. Their combined impedance is

5 +

*j*5

5 -

*j*5

10 +

*j*0

20 -

*j*10

⇒ The cut off wavelength λ

_{c}for TE

_{20}mode for a standard rectangles waveguide is

2/

*a*

2

*a*

*a*

2

*a*

^{2}

⇒ Light dependent resistors are

highly doped semiconductor

intrinsic semiconductor

lightly doped semiconductor

either (a) or (c)

⇒ The band gap of silicon at 300K is

1.36 eV

1.10 eV

0.80 eV

0.67 eV

⇒ If the diameter of a wire is doubled, the current carrying capacity of the wire becomes

half

twice

four times

one-fourth

⇒ Two similar mutually coupled coils have a total inductance of 900 mH and coefficient of coupling 0.5. The self inductance of each coils is

300 mH

150 mH

75 mH

50 mH

⇒ In air friction damping

the air pressure opposes the motion of piston when it is moving inwards

the air pressure opposes the motion of piston when it is moving outwards

the air pressure opposes the motion of piston both when it is moving inwards as well as outwards

the air pressure may oppose or aid the motion of piston depending on the design

⇒ A CE amplifier has

*r*

_{e}= 6 Ω, β = 100 and a = 0.98. The input impedance is

6 Ω

100 Ω

600 Ω

98 Ω

⇒ The sensitivity of a voltmeter using 0-5 mA meter movement is

50 Ω/V

100 Ω/V

200 Ω/V

500 Ω/V

⇒

**Assertion (A):** Negative feedback reduces the bandwidth of an amplifier

**Reason (R):** Negative feedback stabilizes the gain of an amplifier

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

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Surface waves can propagate on Piezoelectric substrates.

TRUE

FALSE

⇒ The term critical frequency denotes

the lowest frequency that is reflected by the ionosphere

the highest frequency that is reflected by the ionosphere at vertical distance

the lowest frequency by which communication is possible between two given points

none of the above

⇒ If quadratic equation

*x*

^{2}- 1000

*x*+ 25 = 0 is solved using floating point arithmetic with 4 digit mantissa, the roots are

.1000 E 4 and .1000 E 4 respectively

.0000 E 4 and .0000 E 4 respectively

.1000 E 4 and .0000 E 4 respectively

None of the above

⇒ Speeds of sound and radio waves are equal.

TRUE

FALSE

⇒ Given figure shows the magnitude plot for a system. The steady state error for unit step inpu

1/101

1/100

14977

14611

⇒ For a two- port reciprocal network, the output open circuit voltage divided by the input current is equal to

B

Z

_{12}

1/

*y*

_{12}

*h*

_{12}

⇒ CD4010 is a

inverting buffer

non-inverting hex buffer

NOR IC

NAND IC

⇒ Electrical conductivity of metals expressed in ohm

^{-1}m

^{-1}is of the order of

10

^{10}

10

^{5}

10

^{-4}

10

^{-6}

⇒ 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

⇒ The Boolean expression B⊕E is a simplified version of expression ABE + BCDE+ BC D E + A B D E + B C D E + A B D E then which of the following choice is correct?

- don't care conditions doesn't exist
- don't care conditions exist
*d*( 16, 18, 20, 23, 27, 29) is the set of don't care conditions*d*( 16, 20, 22, 27, 29) is the set of don't care conditions

1 only

2 and 3 only

2 and 4 only

data insufficient

⇒ A network N is dual of network N if

both of them have same mesh equation

both of them have same node equation

mesh equation of one are the node equations of the other

KCL and KVL equations are the same

⇒ The code which provides for parity check is

Baudot

ASCII

EBCDIC

Excess-3

⇒ Calculate the electrostatic force of repulsion between two mica particles at a distance of 10

^{-13}

*m*from each other. Charge on a particle is 3.2 x 10

^{-19}C. (relative permittivity for mica is 5)

1.843 x 10

^{-15}N

9.2 x 10

^{-2}N

14.41 x 10

^{-9}N

none of these

⇒ The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is

1 μs

2 μs

8 μs

16 μs

⇒ If the gate of JFET is reverse biased, the width of depletion region

becomes zero

is uniform

is more near the source

is more near the drain

⇒ In a series RLC circuit, the current at resonance is I

_{0}the total energy stored in the circuit at resonance is

LI

_{0}

^{2}

2 LI

_{0}

^{2}

2 LI

_{0}

^{2}

0.5 LI

^{2}

⇒ The signals in 8086 are classified into

minimum mode and maximum mode

decrement mode and increment mode

low mode and high mode

none of the above

⇒ A unipole is also known as

omnidirectional radiator

unidirectional radiator

line radiator

none of the above

⇒ Characteristic impedance of a coaxial cable is inversely proportional to ∈

*.*

_{r}TRUE

FALSE