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Q1. | It is desired to couple a coaxial line to a two parallel wire line. It is best to use |

A. | quarter wave transformer [Wrong Answer] |

B. | balun [Correct Answer] |

C. | slotted line [Wrong Answer] |

D. | directional coupler [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 :**

⇒ For the logic circuit shown in figure, the simplified Boolean expression for the output

A + B + C

AB

B

C

⇒ Which one of the systems described by the following I/P - O/P relations is time invariant

*y*(

*n*) =

*n*

*x*(

*n*)

*y*(

*n*) =

*x*(

*n*) -

*x*(

*n*- 1)

*y*(

*n*) =

*x*(-

*n*)

*y*(

*n*) =

*x*(

*n*) cos 2p

*f*

_{0}

*n*

⇒ The time constant of the network shown in figur

2 RC

5/3 RC

RC/2

None of these

⇒ In floating point representation the number of bits in exponent is

8

7

6

5

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

*.*

_{r}TRUE

FALSE

⇒ In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of

120°

60°

240°

any of the above

⇒ A folded dipole antenna is conveniently connected to

shielded line

two wire line

coaxial line

flat ribbon type transmission line

⇒ Narrow band FM signal can be represented as

A cos (2p

*f*) - β

_{c}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) - β

_{m}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) + β

_{c}t*A*sin (2p

*f*) sin (2p

_{c}t*f*)

_{m}tA cos (2p

*f*) + β

_{m}t*A*sin (2p

*f*) sin (2p

_{m}t*f*)

_{c}t⇒ In a JFET

the source gate junction is forward biased and gate drain junction is reverse biased

both the junctions are forward biased

both the junctions are reverse biased

the source gate junction is reverse biased and gate drain junction is forward biased

⇒ Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is

0.25 mH

0.5 mH

0.707 mH

1 mH

⇒ Fields are said to be circularly polarized if

their magnitudes are equal

their magnitudes are equal and they differ in phase by ± 90°

their magnitudes are unequal and they differ in phase ± 90°

their magnitudes are unequal and they are in phase

⇒ Audio cassettes used in household tape recorders have a width of

1"

1/2"

1/4"

1/8"

⇒ If number of information bits is 4, the parity bits in Hamming code are located at bit positions __________ from the LSB.

1, 2, 5

1, 2, 4

1, 2, 3

1, 2

⇒ A Darlington emitter follower circuit is some times used in the output stage of a TTL gate in order to

increase its I

_{QL}

reduce its I

_{0H}

increase its speed of operation

reduce power dissipation

⇒ A 16 bit counter type ADC uses 1 MH

*z*clock then its maximum conversion time is __________ .

16 μ

*s*

15

*ms*

6.6

*ms*

66

*ms*

⇒ Why

*npn*-transistors are preferred over

*pnp*-transistors?

Leakage current in npn-transistors is less than pnp-transistors

Mobility of majority carrier in npra-transistors is greater than the mobility of majority carrier in

*pnp*-transistors

Bias voltage required in npn is less than in/wp-transistors

Bias voltage required in npn is greater than in pnp-transistors

⇒ The resistance of a photoconductor

increases with increase in light intensity

decreases with increase in light intensity

may increase or decrease with increase in light intensity

remains constant

⇒ The current passing through a resistance of 100 ± 0.2% Ω is 2 ± 0.5% A. The limiting error in computation of power will be

± 0.7%

± 0.9%

± 1.2%

± 0.3%

⇒ In figure V

_{BE}= 0.7 V. If base current required to saturate the transistor is 0.1 mA, V

_{i5 V5.7 V10 V10.7 V}

⇒

Match the following:

List I (Logic family) | List II (Characteristic of logic family) | ||
---|---|---|---|

A. | TTL | 1. | Maximum power Consumption |

B. | ECL | 2. | Highest Packing Density |

C. | NMOS | 3. | Least Power Consumption |

D. | CMOS | 4. | Saturated Logic |

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

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

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

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

⇒ The pole zero plot of the given figure is

non-minimum phase function

minimum phase function

all pass function

either (b) or (c)

⇒ In 8085 microprocessor, the interrupt enable flip-flop is reset by

DI instruction only

system RESET only

interrupt acknowledgment only

all of the above

⇒ Lead mounting for SCR is used for

rating less than mA

rating about 1 A or less

rating of 20 A or less than 20 A

rating 100 A or less

⇒ In Bode diagram (log magnitude plot) of the factor 1/(1 +

*j*ωT) in the transfer function the log magnitude for ω << 1/T can be approximated by

0 dB

20 log ωT dB

-20 log ωT dB

none of the above

⇒ The number of leads in a DIAC are

2

3

4

6

⇒ If the target cross-section is changing, the best scanning system for accurate tracking is

lobe switching

monopulse

sequential lobing

conical scanning

⇒ Among the digital IC families - ECL, TTL, and CMOS

ECL has the least propagation delay

TTL has largest fan out

CMOS has the lowest noise margin

TTL has the lowest power consumption

⇒ The output V

_{0}in figur

-100 V

-100 mV

10 V

10 mV

⇒ A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then

V

_{B0}> V

_{Y0}

V

_{B0}< V

_{Y0}

V

_{B0}= V

_{Y0}

V

_{B0}= V

_{BY}

⇒ The op-amp circuit shown in the figure is a filter. The type of filter and its cut off type of filter and its cut off frequency are respectiv

high Pass, 1000 rad/sec

low Pass, 100 rad/sec

high Pass, 10000 rad/sec

low pass, 10000 rad/sec