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Q1. | The attenuation in waveguides near the cut off frequency is |

A. | very low [Wrong Answer] |

B. | very high [Correct Answer] |

C. | medium [Wrong Answer] |

D. | zero [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 :**

⇒ An advantage of memory interlacing is that

a larger memory is obtained

effective speed of memory is increased

cost of memory is reduced

a non-volatile memory is obtained

⇒ Which of the following statement about receivers is false?

Double conversion is used to improve image rejection

Double conversion is used to improve selectivity

Variable sensitivity is used to improve selectivity

Variable sensitivity is used to eliminate selective fading

⇒ DC servomotors are, generally

permanent magnet dc motors

shunt field motors

separately excited dc motors

none of the above

⇒ The current in a

*p*-

*n*junction diode with V volts applied in

*p*region relative to

*n*region (where I

_{0}is reverse saturation current,

*m*is ideality factor,

*k*is Boltzmann's constant, T is absolute temp and

*q*is charge on electron) is

I

_{0}(

*e*

^{-qV/mkT}- 1)

I

_{0}

*e*

^{-qV/mkT}

I

_{0}(

*e*

^{qV/mkT})

I

_{0}(

*e*

^{qV/mkT}- 1)

⇒ A polyphase wattmeter basically consists of two wattmeters. The moving system of two wattmeters

are common

are separate

are generally common

are generally separate

⇒ The number of tightly bound electrons in silicon atom are

14

10

6

4

⇒ The number of FF required for a divide by 12 circuit is

16

12

8

4

⇒ The main purpose of using transformer coupling in a class A amplifier is to make it more

efficient

less costly

less bulky

distortion free

⇒ A generator with an internal resistance of 600 Ω drives an amplifier whose input resistance is 400 Ω. The generator's open circuit voltages is 1 mV; the amplifier develops 100mV across an 8kΩ load. The voltage multiplication is

25

50

125

250

⇒ When iron rod is magnetised by the flowing through its coil, the polarities of its different points wil

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A is N, B and C is S

A is N, C is S

A is S, C is neutral, B is N

⇒ Nyquist stability criterion uses open loop frequency response characteristics.

TRUE

FALSE

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

1.2

*e*2.0

-2.3

*e*- 2

-2.3

*E*2

-2.3

*e*2

⇒ If

*p*is the probability of success and

*q*is the probability of failure, then the probability that there are

*r*successes in

*n*trails is

^{n}

*c*

_{r}

*p*

^{r}*q*

^{n}

^{-}

^{r}

^{n}*c*

_{r}

*p*

^{n -}

^{r}*q*

^{r}^{n}

*c*

_{r}

*p*

^{r}*q*

^{n}

^{+}

^{r}

^{n}*c*

_{r}*p*

^{n}*q*

^{n}^{- r}

⇒ In a driving point function poles and zeros must be conjugate if complex or imaginary.

TRUE

FALSE

⇒ A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through

an RC filter

an envelope detector

a PPL

an ideal low pass filter with the appropriate bandwidth

⇒ Figure shows a portion of linear

*v*-

*i*characteristics of diode. If applied voltage is + 6 V, the current wil

42 mA

48 mA

51 mA

54 mA

⇒ If

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X

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_{C}= 0

X

_{L}= ∞, X

_{C}= ∞

X

_{L}= 0 and X

_{C}= ∞

X

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_{C}= 0

⇒ Which of the following is λ/2 length?

Marconi

Hertz

Parabolic

Yagi-uda

⇒ Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is

3

4

5

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⇒ A frequency multiplier stage should operate as

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class C

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⇒ Consider the following statements as regards DPSK and DEPSK

- DPSK demodulator requires a device which operates at carrier frequency and provides a delay of bit time T
_{b} - In DPSK, synchronous demodulation recovers the signal
*b*(*t*) and the decoding of*b*(*t*) to generate*d*(*t*) is done at base band - In both DPSK and DEPSK errors always occur in pairs

1 and 3

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1, 2 and 3

⇒ Which of the following form of angle modulation in this? If

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*t*)

AM

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AM or FM

AM or PCM

⇒ Consider the following statements

- Fading of signals is generally greatest near radio horizon.
- Fading of signals is generally greatest in shadow zone.
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1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

⇒ The characteristic impedance of a cable is about

300 Ω

50 Ω

5 Ω

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⇒ Out of SR and JK flip flops, which is susceptible to race condition?

SR

JK

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None of the above

⇒ If

*f*(

_{h}*t*) is the Hilbert transform of

*f*(

*t*), and

*f*(

*t*) is a real valued signal, the pre-envelope of

*f*(

*t*) is

*f*(

*t*) -

*jf*(

_{h}*t*)

*f*(

*t*) +

*jf*(

_{h}*t*)

*f*(

_{h}*t*) +

*jf*(

*t*)

*f*(

_{h}*t*) -

*jf*(

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⇒ In RAM, all the information can be obtained at the output with

minimum time delay

unequal time delay

nearly identical time delay

maximum time delay

⇒ A high resistance was measured by loss of charge method. The voltmeter resistance was 10

^{10}ohms. The calculation gave the value of unknown resistance as 0.8 x 10

^{9}ohms. The true value of resistance is

0.8 x 10

^{9}Ω

less than 0.8 x 10

^{9}Ω

more than 0.8 x 10

^{9}Ω

either (b) or (c)

⇒ The transition of electron from energy level W

_{1}to W

_{2}is associated with emission or absorption of electro magnetic radiation of frequency

*f*such that

*hf*= |W

_{1}- W

_{2}|

|W

_{1}- W

_{2}|

*f*=

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_{2}|

(

*hf*)

^{2}= |W

_{1}- W

_{2}|

⇒ In

*n*type MOSFET, the substrate

is

*p*type

is

*n*type

is metallic

may be

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*n*type