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Q1. | The input impedance of short-circuited line of length l where λ/4 < l < λ/2, is |

A. | resistive [Wrong Answer] |

B. | inductive [Wrong Answer] |

C. | capacitive [Correct Answer] |

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

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**Also Read Similar Questions Below :**

⇒ It is desired that transmission line and load should match for a range of frequencies. The best method is

to use a balun

to use a single stub of adjustable position

to use a double stub

to use a broad band amplifier

⇒ The classes of solid dielectrics are

A, B, C, D, E, F, H

A E B F H C D

Y A E B F H C

A E B F H C

⇒ For the floating point numbers 1.81 x 10

^{-29}and 0.0152 x 10

^{18}the normalised forms are

0.181 x 10

^{-28}and 0.152 x 10

^{17 }respectively

18.1 x 10

^{-30}and 0.152 x 10

^{17}respectively

0.181 x 10

^{-28}and 1.52 x 10

^{16}respectively

None of the above

⇒ Companding is used in PCM to

reduce bandwidth

increasing S/N ratio

get almost uniform S/N ratio

increase bandwidth

⇒ In the circuit shown, in switch S is open for a long time and is closed at

*t*= 0. The current

*i*(

*t*) for

*t*≥ 0

^{+i(t) = 0.5 - 0.125e-1000t Ai(t) = 1.5 - 0.125e-1000t Ai(t) = 0.5 - 0.5e-1000t Ai(t) = 0.375e-1000t A}

⇒ Two identical NMOS transistors M

_{1}and M

_{2}are connected as shown below. V

_{bias}is chosen so that both transistors are in saturation. The equivalent

*g*of the pair is defined t

_{m}the sum of individual

*g*'s of the transistors

_{m}the product of individual

*g*'s of the transistors

_{m}nearly equal to the

*g*of M

_{m}_{1}

nearly equal to

*g*/

_{m}*g*

_{0}of M

_{2}

⇒ Which of the following codes provides parity checks?

CCITT-2

EBCDIC

ASCII

Baudot

⇒ The wave propagation occurs without attenuation in case of a

conductor

semiconductor

perfect dielectric

none of the above

⇒ In a network

Number of links = Number of branches - number of nodes + 1

Number of links = Number of branches - number of nodes

Number of links = Number of branches - number of nodes - 1

Number of links = Number of branches - number of nodes - 2

⇒ The accuracy of an instrument is determined by

closeness of indicated value to the actual value

repeatability of measured value

speed with which the reading approaches final value

least value which can be measured

⇒ It is required to measure pressure using LVDT. The additional device needed is

strain gauge

pitot tube

bourden tube

rotameter

⇒ A Varactor diode has

a fixed capacitance

a fixed inductance

a voltage variable capacitance

a current variable inductance

⇒ For a Hertz dipole antenna, the Half Power Beam Width (HPBW) in the E-plane is

360°

180°

90°

45°

⇒ Program counter in a digital computer

counts the number of program run in the machine

counts the number of times a subroutine is called

counts the number of times the loops are executed

points the memory address of the current or the next instruction to be executed

⇒ For TE or TM modes of propagation in bounded media, the phase velocity is

independent of frequency

is a linear function of frequency

is a non-linear function of frequency

can be frequency dependent or frequency independent on the source

⇒ The value of program counter of 6800 at power on are after reset is

0

FFFE

User Programmable

FFFF

⇒ A parallel plate capacitor having C = 200 x 10

^{-12}F has loss dielectric having tan δ = 4 x 10

^{-4}. At an ac voltage of

*f*= 10

^{6}Hz and peak value 2 V, the dielectric losses are

10

^{-8}W

10

^{-6}W

10

^{-4}W

10

^{-2}W

⇒ Which is a digital coding technique?

PCM

DM

DPCM

All

⇒ An intrinsic silicon sample has 2 million free electrons. The number of holes in the sample is

2 million

almost zero

more than 2 million

less than 2 million

⇒ In figure, the short circuit current through terminal AB wil

1.5 A

0.125

0.0833333333333333

0.0416666666666667

⇒ In a vacuum tube, the transit time of electron between cathode and anode is important at

low frequencies

high frequencies

both (a) and (b)

frequencies which are neither very low nor very high

⇒ In microprocessor 8088

8 data bits are multiplexed with 8 least significant bits of address bus

8 data bits are multiplexed with 8 most significant bits of address bus

16 data bits are multiplexed with 16 bits of address bus

none of the above

⇒ For type 2 system, the magnitude and phase angle of the term (

*j*ω)

^{2}in the denominator, at ω = 0, are respectively

0 and - 90°

0 and + 90°

infinity and - 180°

infinity and + 180°

⇒

Match the following:

List I (Memories) | List II (Characteristic) | ||
---|---|---|---|

A. | Static PLA | 1. | erasable, programmable |

B. | CCD | 2. | ultra high speed |

C. | ECL | 3. | stores large volume of data |

D. | GAL | 4. | Does not need refreshing |

5. | Non-volatile |

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

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

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

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

⇒ The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch.

12

20

5

36

⇒ The normal operation of JFET is

constant voltage region

constant current region

both constant voltage and constant current regions

either constant voltage or constant current region

⇒ The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is

10001

1110001

110001

11001

⇒ In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is

0 ≤ a ≤ 180°

0 ≤ a ≤ 150°

0 ≤ a ≤ 120°

0 ≤ a ≤ 90°

⇒ In using mesh current method it is necessary that at least one mesh current links every element.

TRUE

FALSE

⇒ An electron in the conduction band

has higher energy than the electron in the valence band

has lower energy than the electron in the valence band

loses its charge easily

jumps to the top of the crystal