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Q1. | The effective height of an antenna is slightly greater than physical height because |

A. | wave velocity in conductor is less than its velocity in free space [Correct Answer] |

B. | wave velocity in conductor is more than its velocity in free space [Wrong Answer] |

C. | resistance of conductor is less than that of free space [Wrong Answer] |

D. | none of the above [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ Costa's receiver is used for

Coherent detection of AM-SC signal

Asynchronous detection of AM-SC signal

Coherent detection of DSB-SC signal

Asynchronous detection of DSB-SC signal

⇒ Which of the following is not an assembler directive in 8085?

D S

D B

D Q

E Q U

⇒ The circuit in the given figur

low pass filter

high pass filter

band Pass filter

band reject filter

⇒ The circuit shown depic

voltage series negative feedback

voltage shunt negative feedback

current series negative feedback

current shunt negative feedback

⇒ The number of product terms in the minimized sum of product expression obtained through the following

*k*map is (where "

*d*" denotes don't care states)

2

3

4

5

⇒ Push pull amplifier is

voltage amplifier

current amplifier

power amplifier

none of the above

⇒ A parity check usually can detect

one-bit error

double-bit error

three-bit error

any-bit error

⇒ The expression

`A`^{2} + B^{2} - 3 AB

when written is Pascal should be written as`A * A + B * B - 3 A * B`

`A * A + B * B - 3.0 A * B `

`A * A + B * B - 3.0 * A * B`

`A * A + B * A - 3 * A * B `

⇒ A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/

*f*is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be

about 1350 rpm

about 720 rpm

about 360 rpm

either (b) or (c)

⇒ Characteristic wave impedance is

ε/μ

(ε/μ)

^{1/2}

E

_{x}/H

_{y}

H

_{y}/E

_{x}

⇒ If we manage to __________ our natural resources, we would leave a better planet for our children.

uphold

restrain

Cherish

conserve

⇒ The circuit shown in figure conv

BCD to binary code

binary to excess-3 code

excess-3 to Gray code

gray to binary code

⇒ In the absence of noise, if C is channel capacity in bits/s, δ

*f*is channel bandwidth in Hz and N is number of coding levels. Then

C = log

_{2}N

C = (δ

*f*) log

_{2}N

C = 2 (δ

*f*) log

_{2}N

C = 0.5 (δ

*f*) log

_{2}N

⇒ In an Anderson bridge the unknown inductance is measured in terms of

known inductance and resistance

known inductance

known capacitance and resistance

known capacitance

⇒ The approximate value of input impedance of a common emitter amplifier with emitter resistance R

_{e}is given by

*h*

_{ie}+ A

_{I}R

_{e}

*h*

_{ie}+ (

*i*+

*h*

_{fe}) R

_{e}

*h*

_{ie}

(1 +

*h*

_{fe}) R

_{e}

⇒ In shot noise

the current rises around mean value

the current rises to peak value, decreases to zero and then again rises

the current may become negative

the current is always less than the mean value

⇒ The function shown in the fig

impulse function

signum function

unit step function

none of the above

⇒ When negative feedback is used the fractional changes in closed loop gain are desensitized by the factor (1 + A

_{v}β)

TRUE

FALSE

⇒ FM receivers using the standard 88 to 108 MHz band use IF of

8 MHz

9.9 MHz

10.7 MHz

12.2 MHz

⇒ Consider the following part of a C program float a

2 and 9

2.0 and 9.0

2.0 and 2.0

9.0 and 2.0

⇒ In VHS format each video head is tilted from azimuth by

20°

10°

6°

1°

⇒

Match the following:

List I (Types of N-bit ADC) | List II (Characteristics) | ||
---|---|---|---|

A. | Flash converter | 1. | Integrating Type |

B. | Successive | 2. | Fastest converter approximation |

C. | Counter ramp | 3. | Maximum conversion time = N bits |

D. | Dual slow | 4. | Used a DAC in its feedback path |

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

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

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

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

⇒ A two stage amplifier has an upper cutoff frequency of 2 MHz and a lower cutoff frequency of 2 MHz and a lower cut off frequency of 30 Hz. If both stages are similar, their individual upper and lower cut off frequencies respectively are

4 MHz and 60 MHz

3 MHz and 20 Hz

3 MHz and 60 Hz

4 MHz and 20 Hz

⇒ An intrinsic silicon sample has 1 million free electrons at room temperature. As the temperature is increased

the number of free electrons increases

the number of free electrons increases but the number of holes decreases

the number of free electrons and holes increase by the same amount

the number of free electrons and holes increase but not by the same amount

⇒ In figure I

_{D}= 4 mA. Then V

_{S20 V4.4 V0.4 V0.44 V}

⇒ In a class C operation V

_{CC}= 40 V and V

_{CE(sat)}= 0.4 V. The efficiency is

0.9

0.495

0.01

0.005

⇒ BPSK stands for

Binary Phase Shifting Key

Broad Phase Shifting Key

Bit Phase Shifting Key

Binary Pulse Shifting Key

⇒ A memory system has a 9 chips. If MTBF of one clip is 900 000 hours, MTBF of complete memory system is

900000 hours

100000 hours

8100000 hours

1800000 hours

⇒ The gate electrode in the FET corresponds to the

collector in a bipolar transistor

base in a bipolar transistor

emitter in a bipolar transistor

none of the above

⇒ For a directional coupler the power is in the ratio of

40 dB

30 dB

20 dB

10 dB