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Q1. | For transmission-line matching over range of frequencies, it is best to use a |

A. | single stub of adjustable position [Wrong Answer] |

B. | double stub [Correct Answer] |

C. | broadband directional coupler [Wrong Answer] |

D. | balun [Wrong Answer] |

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

⇒ A two branch parallel circuit has a 10 Ω resistance and 0.5 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply. At resonance, the source current is

0.416666666666667

0.0416666666666667

0.2 A

0.05 A

⇒ Consider the following mnemonics

- MOV
- ADD
- LXI

Which of the above are valid for 8085?1 and 2 only

1 only

1, 2 and 3

1 and 3 only

⇒ The dynamic resistance of a forward biased

*p*-

*n*diode

varies inversely with current

varies directly with current

is constant

is either constant or varies directly with current

⇒ Discrete transistors T

_{1}and T

_{2}having maximum collector current rating of 0.75 amp are connected in parallel as shown in the figure, this combination is treated as a single transistor to carry a total current of 1 ampere, when biased with self bias circuit. When the circuit is switched on, T

_{1}draws 0.55 amps and T

_{2}draws 0.45 amps. If the supply is kept on continuously, ultimately it is very likely

Both T

_{1}, and T

_{2}get damaged

Both T

_{1}, and T

_{2}will be safe.

T

_{1}Will get damaged and T

_{2}will be safe

T

_{2}will get damaged and T

_{1}, will be safe.

⇒ Self impedance is

same for transmitting (T

_{t}) and receiving antenna (T

_{r})

T

_{t}> T

_{r}

T

_{r}> T

_{t}

no relation

⇒ Consider the following types of distortions in diode detectors

- Distortion is caused due to the reason that dc and ac load impedances are unequal
- Distortion is caused because ac load impedance has a reactive component at high audio frequencies
- Audio frequency diode current is less than dc current

1, 2 and 3

1 and 2

1 and 3

2 and 3

⇒ In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be

1010 kHz

1455 kHz

1910 kHz

545 kHz

⇒ The main advantage of CMOS circuit is

high gain

high output impedance

low power consumption

high gain and high output impedance

⇒ In a resistive ac circuit, the current __________ the voltage by __________ .

lags, 90°

lags, 45°

lags, 0°

leads 90°

⇒ An

*m*derived low pass filter has

*f*

_{c}= 1000 Hz,

*f*

_{∞}= 1250 Hz and

*m*= 0.6. If

*m*is increased, then

both

*f*

_{c}and

*f*

_{∞}will increase

both

*f*

_{c}and

*f*

_{∞}will decrease

*f*

_{c}will remain constant but

*f*

_{∞}will decrease

*f*

_{c}will remain constant but

*f*

_{∞}will increase

⇒ In a uniformly doped BJT, assume that N

_{E}, N

_{B}and N

_{C}are the emitter, base and collector dopings in atoms/cm

^{3}, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following conditions is TRUE?

N

_{E}= N

_{B}= N

_{C}

N

_{E}>> N

_{B}and N

_{B}> N

_{C}

N

_{E}= N

_{B}and N

_{B}< N

_{C}

N

_{E}< N

_{B}< N

_{C}

⇒ In

*p*-

*n*-

*p*transistor the current I

_{E}has two components viz. I

_{EP}due to injection of holes from

*p*-region to

*n*-region and I

_{E}due to injection of electrons from

*n*-region to

*p*-region. Then

I

_{Ep}and I

_{En}are almost equal

I

_{Ep}>> I

_{En}

I

_{En}>> I

_{Ep}

either (a) or (c)

⇒ In figure

*v*

_{1}= 8 V and

*v*

_{2}= 4 V. Which diode will cond

D

_{2}only

D

_{1}only

Both D

_{1}and D

_{2}

Neither D

_{1}nor D

_{2}

⇒ A copper coil has a resistance of 40 ohm at 20°C. At 100°C the resistance is likely to be

44 Ω

54 Ω

84 Ω

104 Ω

⇒ The total number of pulses in a TV remote control is

14

12

10

8

⇒ In the following non planar graph number of independent loop equations

8

12

7

5

⇒ In a superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

750 kHz

990 kHz

1650 kHz

2100 kHz

⇒ Paper capacitors are used in power supplies for filtering.

TRUE

FALSE

⇒ The transient currents are due to

resistance of the circuit

impedance of the circuit

voltage applied to the circuit

changes in stored energy in inductors and capacitors

⇒ In an ordinary thyristor

turn on and turn off times are equal

turn on time is more than turn off time

turn off time is more than turn on time

turn on time may be equal, less than or more than turn off time

⇒ The number of branches of root locus plot is equal to

the number of roots of characteristic equation

double the number of roots of characteristic equation

the number of roots of characteristic equation minus one

the number of roots of characteristic equation plus one

⇒ MCVF telegraphy causes

SSB techniques

pulse modulation

Out of bond signalling

FM

⇒ Schering bridge operates at a high voltage of about 10 kV.

TRUE

FALSE

⇒ As temperature increases, the temperature coefficient of a metal

decreases

increases

remains unchanged

any of the above

⇒ Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

TTL

CMOS

ECL

TTLLS

⇒ A voltage wave

*v*= 10 + 20 sin ω

*t*+ 7.5 sin 3 ω(

*t*) is applied to a series combination of two elements. The current is

*i*= 5 sin (ω

*t*+ 20°) + 1.5 sin (3ω

*t*+ 10°). The elements are

R and C

R and L

L and C

both inductances

⇒ Decimal 43 in hexadecimal and BCD number system is respectively.

B2, 01000011

2B, 01000011

2B, 00110100

B2, 01000100

⇒ Class C operation finds application in

RF power amplifiers

frequency multipliers

both (a) and (b)

neither (a) nor (b)

⇒ The poles and zeros of a positive real function

may lie any where in

*s*plane

may have positive or negative real part

must occur in conjugate pair

must have either negative or zero real part

⇒ The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

TRUE

FALSE