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Q1. | In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased? |

A. | TE_{01} [Correct Answer] |

B. | TE_{11} [Wrong Answer] |

C. | TE_{05} [Wrong Answer] |

D. | TE_{21} [Wrong Answer] |

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

⇒ Voltage 1 + 2 sin ω

*t*is applied to the circuit shown be

0 volt

2 volts

-2 volts

-3 volts

⇒ A 2 bit BCD D/A converter is a weighted resistor type with E

_{R}= 1V, R = 1 MΩ and R

*= 10KΩ then Resolution in percent and volt is __________ .*

_{f}1%, 1 mv

10%, 10 mv

10%, 1 mv

1%, 10 mv

⇒ The input impedance of op-amp circuit of figur

120 k ohm

110 k ohm

infinity

10 k ohm

⇒ A MOSFET has a threshold voltage of 1 V and oxide thickness of 500 x 10

^{-8}[ε

_{r}= 3.9; ε

_{0}= 8.85 x 10

^{-14}F/cm,

*q*= 1.6 x 10

^{-19}

*c*]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to - 1 V are __________ .

8.6 x 10

^{11}/

*cm*

^{2},

*p*-type

8.6 x 10

^{11}/

*cm*

^{2},

*n*-type

0.86 x 10

^{9}/

*cm*

^{2},

*p*-type

1.02 x 10

^{12}/

*cm*

^{2},

*n*-type

⇒ RS latch can be built with

NOR gates

NAND gates

NOR or NAND gates

none of the above

⇒ For a junction FET in the pinch off region, as the drain voltage is increased, the drain current

becomes zero

abruptly decrease

abruptly increases

remains constant

⇒ CATV stands for

Common Antenna Television

Community Antenna Television

Cable Antenna Television

Channel Antenna Television

⇒ Which of the following is not a valid real constant?

-73.1

10251,3

10.23

-5.7381

⇒ For a class B amplifier using a supply of V

_{CC}= 30 V and driving a load of 16 Ω the maximum efficiency will be __________ .

0.724

0.7854

0.624

0.6854

⇒ A conductor in

*x-y*plane and having length 1 m is moving with a velocity V = (2

*i*+ 3

*j*+

*k*) m/sec. A magnetic induction field B = (

*i*+ 2

*j*) Wb/m

^{2}is applied to the conductor. The potential difference between the ends of the conductor is

0

4.88 V

6 V

None of these

⇒ The zener diode in the rectangular circuit shown in the figure has a zener voltage of 5.8 volts and a zener knee current of 0.5 mA. The maximum load current drawn from this circuit ensuring proper functioning over the input voltage range between 20 and 30 volts

23.7 mA

14.2 mA

13.7 mA

24.2 mA

⇒ The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has a directivity of 100 is __________ .

15.92

31.84

3.184

1.592

⇒ In which of the following 8085 instructions are all condition flags except

`CY`

affected?`INR `*r*

`SEE M`

`ACI data`

`ADC`* r*

⇒ A sinusoidal voltage amplitude modulates a carrier of peak value 5 kV. Each side band has an amplitude of 500 V. The modulation index is

0.1

0.2

0.4

0.8

⇒ A bipolar transistor is a __________ controlled devices whereas a FET is a __________ controlled devices.

current, voltage

current, current

voltage, current

voltage, voltage

⇒ MOSFET can be used as a

current controlled capacitor

voltage controlled capacitor

current controlled inductor

voltage controlled inductor

⇒ The probability giving distribution of electrons over a range of allowed energy levels is known as

Maxwell's Distribution

Fermi-Dirac Distribution

Richardson Dushman Distribution

none of the above

⇒

Match the following:

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

A. | IF noise | 1. | Ganged tuning |

B. | Image frequency | 2. | Spurious response |

C. | Station selector | 3. | Leaky filter capacitor |

D. | Excessive Hum | 4. | Mixer stage |

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

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

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

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

⇒ For frequencies upto 1650 kHz __________ antenna is used

yagi

grounded

turnstile

marconi

⇒ Consider 49 cascaded amplifiers having individual rise time as 2 n sec. 3 n sec. ... 50 n sec. The input waveform rise time is 1 n sec. Then the output signal rise time is given time by (Assume output signal rise time is measured within 10 percent range of the final output signal.)

39 - 28 μsec

2.28 μsec

0.228 μsec

39.28 μsec

⇒

Match the following:

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

A. | Reactance theorem | 1. | Foster |

B. | Driving point impedance | 2. | Bartlett |

C. | Continued fraction expansion | 3. | Cauer |

D. | Bisection Theorem | 4. | Positive real function |

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

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

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

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

⇒ In a metal the probability of a state 0.1 eV below Fermi level being occupied

is more than the probability of state 0.1 eV above Fermi level being occupied

is the same as the probability of state 0.1 eV above Fermi level being occupied

is less than the probability of state 0.1 eV above Fermi level being occupied

may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied

⇒ Point out the wrong statement, Sequential logic circuit is

one that requires a clock to change states

one in which past affects the present states

one whose outputs changes immediately when the inputs change

also called clock logic or synchronous logic

⇒ The maximum range of a transmitter depends on

its frequency

its power

both its frequency and power

none of the above

⇒ In a JFET, the drain current is maximum when

V

_{GS}= V

_{DS}

V

_{GS}= pinch off voltage

V

_{GS}= 0

V

_{GS}is negative

⇒ One of the following can be used to generate a pulse whenever triggered

flip-flop

monostable multivibrator

stable multivibrator

Schmitt trigger

⇒ Above ferroelectric curie temperature, spontaneous polarization in ferroelectric materials becomes stronger.

TRUE

FALSE

⇒ Nichols chart consists of M and N locii in log magnitude versus phase diagram.

TRUE

FALSE

⇒ The output of the circuit shown below will be of the frequ

125 Hz

250 Hz

500 Hz

750 Hz

⇒ Which of the following antenna is best guided by a waveguide?

Biconical

Horn

Helical

Dish