Question is ⇒ Tropospheric mode of propagation is used in, Options are ⇒ (A) UHF, (B) VLF, (C) MF, (D) HF, (E) , Leave your comments or Download question paper.

Question is ⇒ Tropospheric mode of propagation is used in, Options are ⇒ (A) UHF, (B) VLF, (C) MF, (D) HF, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Tropospheric mode of propagation is used in
A.	UHF [Correct Answer]
B.	VLF [Wrong Answer]
C.	MF [Wrong Answer]
D.	HF [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A 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 :

⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. How much feedback should be used to provide the desired level?
0.0003
0.0033
0.013
0.033

⇒ The heat sink disposes off heat mainly by
radiation
natural convection
forced convection
conduction

⇒ The current i(t) through a 10 Ω resistor in series with an inductance is given by i(t) = 3 + 4 sin (100t + 45°) + 4 sin (300t + 60°) Amperes. The RMS value of the current and the power dissipated in the circuit are
41 A, 410 W respectively
35 A, 350 W respectively
5 A, 250 W respectively
11 A, 1210 W respectively

⇒ In which frequency range is the noise figure in a transistor independent of frequency
intermediate frequencies
high frequency
low frequencies
both low and high frequencies

⇒ The frequency response of an ideal tuned amplifier should be as represented in figur
A
B
C
D

⇒ A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?
0.1
0.25
0.5
0.75

⇒ Thyristors connected in series need static and dynamic stabilizing circuits.
TRUE
FALSE

⇒ A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.
TRUE
FALSE

⇒ Noise which assumes great importance at high frequencies is
flicker noise
Johnson noise
transit-time noise
shot noise

⇒ The decoder for PAL system is
similar to NTSC decoder
similar to NTSC decoder supplemented by 64 ms delay line
similar to NTSC decoder supplemented by 64 ms delay line and an electronic commutator
either (b) or (c)

⇒

Assertion (A): L[af₁(t) + bf₂(t)] = aF₁(s) - bF₂(s)

Reason (R): Initial value theroem enables us to find the value of f(t) at t = 0 directly from F(s)

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 true, R is false
A is false, R is true

⇒ For the binary number 11101000, the equivalent hexadecimal number is
F 9
F 8
E 9
E 8

⇒ A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is
0.0833333333333333
0.0416666666666667
10⁶A
10 μA

⇒ Bipolar IC memories are fabricated using
high density versions of the bipolar transistor flip-flop
low density versions of the unipolar transistor flip-flop
high density versions of the MOSFET
low density versions of the MOSFET

⇒ TV signal strength when expressed in dB m has the reference of
10 μV/m
5 μV/m
2 μV/m
1 μV/m

⇒ The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be
less than 90°
less than 45°
180°
30°

⇒ A TE₁₀ rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is
15 mm
10 mm
9 mm
7.5 mm

⇒ Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is
0.5
0.25
0.125
0.5

⇒ Pilot-carrier transmission is one in which
only one sideband is transmitted
one sideband and carrier are transmitted
only two sidebands are transmitted
two sidebands as well as a trace of carrier are transmitted

⇒ If the Nyquist plot does not encircle the (-1 + j0) point the system is always stable.
TRUE
FALSE

⇒ The commutation method in an inverter, is
line commutation
forced commutation
either (a) or (b)
none of the above

⇒ Microwave links are typically 50 km apart
because of atmospheric attenuation
because of output tube power limitation
because of earth's curvature
to ensure that applied dc voltage is not excessive

⇒ The minimum gate current which can turn on SCR is called :
trigger current
holding current
junction current
breakover current

⇒ Out of SAM and RAM
access time in both does not depend on address location
in SAM access time depends on address location but not in RAM
in RAM access time depends on address location but not in SAM
in both the access time depends on storage location

⇒ In figure, the voltage V₁ = 4∠0 V. The source voltage V_{28 - j8 volts
4 - j4 volts
8 - j4 volts
8 - j16 volts}

⇒ Fourier transform is defined for
periodic
non-periodic
finite duration
all

⇒ Wave A = 100 sin ωt and wave B = 100 cos ωt. Then
rms values of the two waves are equal
rms values of A is more than that of B
rms values of A is less than that of B
rms values of the two waves may or may not be equal

⇒

Match the following:

	List I (Circuit)		List II (Characteristics)
A.	Darlington pair	1.	uses pnp and npn transistors used as power amplifier
B.	CB amplifier	2.	Voltage gain nearly 1 and high input impedance
C.	Cascade amplifier	3.	low input impedance used for high frequency isolation

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

⇒ When avalanche breakdown occurs covalent bonds are not affected.
TRUE
FALSE

⇒

Assertion (A): A dc potentiometer measures the true open circuit emf of a source.

Reason (R): At balance point, a dc potentiometer does not draw any current from the source.

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