Question is ⇒ A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of the antenna is 30<span class="root">2</span> m. The calculated value of radiation resistance is, Options are ⇒ (A) 1.58 Ω, (B) 158 Ω, (C) 15.8 Ω, (D) none, (E) , Leave your comments or Download question paper.

Question is ⇒ A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of the antenna is 30<span class="root">2</span> m. The calculated value of radiation resistance is, Options are ⇒ (A) 1.58 Ω, (B) 158 Ω, (C) 15.8 Ω, (D) none, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of the antenna is 302 m. The calculated value of radiation resistance is
A.	1.58 Ω [Wrong Answer]
B.	158 Ω [Wrong Answer]
C.	15.8 Ω [Correct Answer]
D.	none [Wrong Answer]
View Answer 3 -4 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Frequency shift keying is used mostly in
telegraphy
telephony
satellite communication
radio transmission

⇒ Which of the following instruments has non-linear scale?

Moving coil instrument
Moving iron instrument
Electrostatic instrument
Rectifier instrument

Select the answer as per following codes
2 only
2 and 3 only
2, 3 and 1
1, 2, 3 and 4

⇒ Figure repres
Integrator
Differentiator
High Pass Filter
Band Pass Filter

⇒ Which of these has highly doped p and n region?
PIN diode
Tunnel diode
Schottky diode
Photodiode

⇒ In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are
1
2
3
4

⇒ In VHS format the width of tape is
2"
1"
1/2"
1/4"

⇒ In FM, as the modulating frequency decreases and the modulating voltage amplitude
increases, the modulation index increases
decrease, the modulation index increases
remains constant, the modulation index increases
remains constant, the modulation index decreases

⇒ A variable resistance R and capacitive reactance X_C are connected in series. As R is varied, the locus of Z is
a straight line parallel to Y axis in 4th quadrant
a straight line parallel to X axis in 4th quadrant
a straight line parallel to Y axis in second quadrant
a straight line parallel to Y axis in first quadrant

⇒ A thermistor is used for
over voltage protection
temperature alarm circuit
automatic light control
none of the above

⇒ An 8 bit DAC has a full scale output of 2 mA and full scale error of ± 0.5%. If input is 10000000 the range of outputs is
994 to 1014 μA
990 to 1020 μA
800 to 1200 μA
none of the above

⇒

Assertion (A): When all inputs of a NAND-gate are shorted to get a one input, one output gate, it becomes an inverter.

Reason (R): When all inputs of a NAND-gate are at logic 'O' level, the output is at logic 'I' level.

Both A and R are individually true and R is the correct explanation of A
Both A and R are individually true but R is not the correct explanation of A
A is true but R is false
A is false but R is true

⇒

Assertion (A): Hall effect is observed in all metals but is very appreciable in semiconductors.

Reason (R): Hall effect transducer is very suitable for measurement of magnetic flux density.

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

⇒ (29)₁₃ ÷ (29)₁₂ x (29)_x = (23)₁₆ Find x
11
12
13
16

⇒ Consider the following sets of values of E, R and C for the circuit in the given fig
1 and 4
1 and 2
3 and 4
2 and 3

⇒ The number of key words in C is
4
8
16
32

⇒ A surge voltage
has very high magnitude and very long duration
has very high magnitude and very small duration
has very high magnitude and very small duration and can be positive or negative
can be only positive

⇒ It is required to measure temperature in the range of 1300-1520°C. The most suitable thermocouple is
chromel constantan
iron constantan
chromel aluminium
platinum-rhodium

⇒ The radiation pattern of loop antenna is
circle
semicircle
elliptical
cardoid or Limacon

⇒ An RC impedance function has a constant value at s = 0. The last element in the first cauer synthesis
will be a capacitor
may be R or C
will be R
will depend on the behaviour of function at s = ∞

⇒ An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 Ω. The standing wave ratio will be
1.5
2.5
3.5
4.5

⇒ The output voltage of a charger is
less than battery voltage
same as battery voltage
more than battery voltage
same or more than battery voltage

⇒ A single phase cycloconverter feeds a resistance heating load. The heating power is provided by
only the fundamental component of output wave
only higher harmonics in the output wave
both fundamental and higher harmonics in the output wave
either (a) or (b)

⇒ In the op-amp circuit of figure, V_{010 V
-10 V
5 V
-5 V}

⇒ The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is
16
256
2
4

⇒ Which of the following can provide a digital signal?
Slow change in the value of a resister
Sine wave
Square wave
Gradual turning of a potentiometer

⇒ Which of the following codes provides parity checks?
CCITT-2
EBCDIC
ASCII
Baudot

⇒ Assume that op-amp in figure is ideal. If input V_i is triangular, the output V₀ wil
square wave
sine wave
triangular wave
parabolic wave

⇒ Two voltages are v₁= 100 sin (ωt + 15°) and v₂ = 60 cosωt, then
v₁ is leading v₂ by 15°
v₁ is leading v₂ by 75°
v₂ is leading v₁ by 75°
v₂ is lagging v₁ by 15°

⇒ For class B operation the theoretical maximum efficiency is
1
0.785
0.5
0.275

⇒ Which of the following quantities cannot be measured/determined using Hall effect?
Type of semiconductor (p or n)
Mobility of charge carriers
Diffusion constant
Carrier concentration