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Q1. | Calculate wave impedance for TE mode |

A. | (377)Ω [Wrong Answer] |

B. | 226 Ω [Wrong Answer] |

C. | ∞ [Wrong Answer] |

D. | 629 Ω [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

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Both A and R are correct but R is not correct explanation of A

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⇒ Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

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In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation

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TM

⇒ A parallel plate capacitor having C = 200 x 10

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⇒ An AC circuit has two branches in parallel. The current in one branch is 5 A. Then the current source

must be less than 5 A

must be more than 5 A

may be equal or more or less than 5 A

0.208333333333333

⇒

Match the following:

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

A. | h_{ie} | 1. | 49 |

B. | h_{re} | 2. | 25 x 10^{-6}siemens |

C. | h_{fe} | 3. | 2.4 x 10^{-4} |

D. | h_{oe} | 4. | 1000 ohms |

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

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

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

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

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divide by 5 circuit

divide by 2 circuit

divide by 5 circuit followed by divide by 2 circuit

BCD counter

⇒ Given a power supply filter circuit, what measurements must be made of determine percentage regulation

current through and voltage across the capacitor

d.c. load voltage and r.m.s. load voltage

current through load and voltage across load resistance

number of turns and gauge of secondary winding of transformer

⇒ In a circular waveguide TE

_{21}mode has lowest cutoff frequencyTRUE

FALSE

⇒ An SR flip flop can be built using NOR gates or NAND gates.

TRUE

FALSE

⇒ Limiter is not essential in the following detector

foster-Seeley

ratio detector

balanced

none of the above

⇒ A

*n*-type silicon sample contains a donor concentration of N_{d}= 2 x 10^{16}cm^{-3}. The minority carrier hole lifetime is t_{p0}= 5 μs. The thermal equilibrium generation rate of hole is:1.125 x 10

^{9}cm^{-3}s^{-1}0.625 x 10

^{9}cm^{-3}s^{-1}4.5 x 10

^{9}cm^{-3}s^{-1}2.25 x 10

^{9}cm^{-3}s^{-1}⇒

**Assertion (A):** Most of actual systems are non-linear.

**Reason (R):** Non linearity may be due to saturation, dead zone, square law *etc*.

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

Both A and R are correct but R is not correct explanation of A

A is correct but R is wrong

R is correct but A is wrong

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autocorrelation and power spectral density

autocorrelation and convoloution

convolution and power spectral density

autocorrelation and energy

⇒ A germanium diode has a reverse saturation current of 30 μA at 125°C and forward current of 1

*m*A at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.10.7 Ω, 70

*k*Ω34 Ω, 20

*k*Ω80 Ω, 20

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*k*Ω⇒ Frequency shift keying is used mostly in

telegraphy

telephony

satellite communication

radio transmission

⇒ Which of the following microphones has highest output impedance?

Carbon

Ribbon

Crystal

Condenser

⇒ In a modem digital computer, a subtractor in normally not used because

subtractors are very expensive

the design of a subtractor is very complex

the adder is geared for doing subtraction

most of the programs do not require subtraction

⇒ Consider the following statements

- Dissipative attenuator has a fixed value of attenuation.
- Reflective attenuator has a fixed value of attenuation.
- Both dissipative and reflective attenuators are available only with fixed attenuation.
- Both dissipative and reflective attenuators are available with either fixed or variable attenuation.

1 only

1 and 2

1, 2 and 3

4 only

⇒ Phase modulation is commonly-used for data transmission mainly because

phase can be varied from + 180° to 180°

it is resistant to the effects of noise

demodulation is very easy

it gives highest data rates that can be transmitted over a given channel

⇒ A dependent source

may be a current source or voltage source

is neither a current source nor a voltage source

is always a voltage source

is always a current source

⇒ A dielectric material must be

insulator

good conductor

resistor

semiconductor

⇒ The resolution of a 12-bit D/A converter using a binary ladder with + 10V as the full scale output will be

2.44 mV

3.50 mV

4.32 mV

5.12 mV

⇒ The

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

FALSE

⇒ Energy content of atmospheric noise

does not depend on frequency

decreases as frequency is increased

increases as frequency is increased

either (a) or (c) depending on the temperature

⇒ In a conductor which of the following relations hold good?

∇ x D = r

∇ . D = r

∇ x D = 0

∇ . D = 0

⇒ 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 25 MHz will be

24.09 MHz

24.54 MHz

25.45 MHz

25.91 MHz

⇒

Match the following:

List I (F.T and F.S) | List II (Properties) | ||
---|---|---|---|

A. | Fourier Series | 1. | Discrete, Periodic |

B. | Fourier Transform | 2. | Continuous, Periodic |

C. | Discrete Time Fourier | 3. | Discrete aperiodic |

D. | Discrete Fourier Transform | 4. | Continuous, aperiodic |

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

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

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

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

⇒ Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation

In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation

The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.

TM

_{11}is called the dominant mode.