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Q1. | Which one of the following is the correct statement? The region of convergence of z transform of x[n] consists of the values of z for which x[n] r^{-n} is |

A. | absolutely integrable [Wrong Answer] |

B. | absolutely summable [Correct Answer] |

C. | unity [Wrong Answer] |

D. | < 1 [Wrong Answer] |

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

⇒ Consider the following statements:

- Taking 2's complement is equivalent to sign change.
- In the 2's complement representation the most significant bit (MSB) is zero for a positive number.
- In a 4 bit binary representation of a binary number A, A + 1's complement of A = 2
^{4}.

1 and 2 only

1 and 3 only

2 and 3 only

1, 2 and 3

⇒ In a certain '12 channel TDM' system it is found that channel no. 3 and channel no. 8 are connected to the same input signal. This technique

wastes the channel capacity

takes care of different sampling rate

is required when different bandwidth signals are to be transmitted

reduces noise

⇒ ∇

^{2}is

vector

scalar

depend on direction

none

⇒ The poles of an RC function

are simple and lie or negative real axis

are simple and lie on ω axis

must be complex conjugate

may be anywhere on

*s*plane

⇒ Two ammeters having resistances of 0.5 Ω and 0.25 Ω and having full scale reading of 25 A each are connected in parallel. To ensure that neither of them goes beyond scale, the total current should not be more than

50 A

37.5 A

25 A

40 A

⇒ During forward blocking state of SCR, the voltage and current respectively are

high and high

low and low

high and low

low and high

⇒ In a digital measuring device the input electrical signal is in the frequency range of dc to ac (50) Hz. It must be sampled at a rate of

*f*times/sec

0.5

*f*times/sec

0.25

*f*times/sec

2

*f*times/sec

⇒ Figure represen

Diode rectifier

Schottky diode

Varistor

None of the above

⇒ The

*h*parameter equivalent circuit of BJT has one voltage source and one current source.

TRUE

FALSE

⇒

**Assertion (A):** Thevenin's theorem and Norton's theorem are dual of each other.

**Reason (R):** Voltage source can be converted into current source and vice versa.

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

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ A reflex klystron oscillator is a

low power device

high power device

high efficiency device

both (a) and (b)

⇒ Calculate

*i*(

*t*) for

*t*≥ 0, assuming the switch has been in position A for a long time at

*t*= 0, the switch is moved to positio

1 +

*e*

^{-5 x 103t}

*e*

^{-5 x 103t}

1.11

*e*

^{-5 x 103t}

1.11 (1 -

*e*

^{-5 x 103t})

⇒ In a forward biased

*p*-

*n*junction current enters

*p*material as hole current and leaves

*n*material as electron current of the same magnitude.

TRUE

FALSE

⇒ When Z

_{1}<< Z, The circuit of figure work

inverting amplifier

Schmitt trigger

non-inverting amplifier

source follower

⇒ Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60

60

100

30

90

⇒ In following figure find V

_{DSQ}by assuming gate current is negligible for the

*p*-channel JFET. (if I

_{DQ}= - 6 mA, R

_{S}= 0, V

_{DD}= -18 V, R

_{D}= 2 kΩ, I

_{DSS}= - 10 mA, I

_{PO}= - 3 V)

4 V

- 6 V

- 10 V

6 V

⇒ Consider the following DO statement in FORTRAN 77

6

1

8

⇒ For telegraphy the most commonly used modulation system is

FSK

two tone modulation

PCM

single tone modulation

⇒ R, L and C are in parallel. The circuit is switched on to a constant current source I at

*t*= 0. At

*t*= ∞ the current through inductance is I.

TRUE

FALSE

⇒ An op-amp integrating circuit uses

an inductor

a capacitor

both inductor and capacitor

none of the above

⇒ The current flow in a semiconductor is due to

holes

electrons

holes and electrons

holes, electrons and ions

⇒

Match the following:

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

A. | lag compensation | 1. | Exterior of unit circle |z| = 1 |

B. | lead compensation | 2. | PD control |

C. | stability | 3. | Non-minimum phase |

D. | Instability | 4. | Left half s plane |

5. | PI control |

A-2, B-5, C-1, D-3

A-3, B-1, C-2, D-5

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

A-5, B-2, C-4, D-1

⇒ Value of 'K' for the system for which the system is stab

*K*< 1

*K*> 1

*K*< 2

*K*> 2

⇒ Characteristic wave impedance is

ε/μ

(ε/μ)

^{1/2}

E

_{x}/H

_{y}

H

_{y}/E

_{x}

⇒ Secondary emission is always decremental.

TRUE

FALSE

⇒ In a bipolar transistor, the base collector junction has

forward bias

reverse bias

zero bias

zero or forward bias

⇒ A transistor is operated as non-saturated switch to eliminate

turn on time

turn off time

storage time

delay time

⇒ In a 3 input NAND gate, the number of states in which output is 1 equals

8

1

6

5

⇒ If E is energy level of electron and E

_{F}is Fermi level, then

all quantum states with E less than E

_{F}will be occupied at T = 0

all quantum states with E less than E

_{F}will be empty at T = 0

some quantum states with E less than E

_{F}will be occupied at T = 0

none of the above

⇒ The circuit of figure is used to measure the value R

_{x}. Ammeter resistance R

_{a}= 0.1 Ω voltmeter resistance R

_{v}= 5000 Ω. It R

_{x1}and R

_{x2}, are the measured values of R

_{x}with switch in position 1 and 2, the mean of R

_{x1}, and R

_{x2},

9.98 Ω

10 Ω

10.04 Ω

10.1 Ω