Question is ⇒ Line of sight transmission is used in, Options are ⇒ (A) radio frequencies below 1 MHz, (B) VHF only, (C) audio signals only, (D) VHF and UHF, (E) , Leave your comments or Download question paper.

Question is ⇒ Line of sight transmission is used in, Options are ⇒ (A) radio frequencies below 1 MHz, (B) VHF only, (C) audio signals only, (D) VHF and UHF, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Line of sight transmission is used in
A.	radio frequencies below 1 MHz [Wrong Answer]
B.	VHF only [Wrong Answer]
C.	audio signals only [Wrong Answer]
D.	VHF and UHF [Correct Answer]
View Answer 1 -1 Explanation:- Answer : D 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 :

⇒ A pulsed radar produces 1 μ sec pulses at a rate of 1000 per second. The duty cycle is
0.001
0.01
0.1
1

⇒ (62)₁₀ in binary system is
110000
111100
111110
111111

⇒ When p-n junction is reverse biased the holes in p material move towards the junction and electrons in n material move away from the junction.
TRUE
FALSE

⇒ In a negative feedback amplifier A = 100, β = 0.04 and V_s = 50 mV, then feedback will be
4
8
10
2

⇒ Which of the following cannot be the Fourier series expansion of a periodic signal?
x(t) = 2 cos t + 3 cos 3t
x(t) = 2 cos pt + 7 cos t
x(t) = cos t + 0.5
x(t) = 2 cos 1.5pt + sin 3.5 pt

⇒ A mP contains 2 MHz crystal. The time taken to complete instructions with 1000 cycles is
2 ms
1 ms
2 nx
1 ns

⇒ Which of the following is the fastest switching device?
JFET
BJT
MOSFET
Triode

⇒ A negative feedback can be of
2 types
3 types
4 types
only 1 type

⇒ In the signal flow graph of figure, y/x equ
3
42857
2
None of the above

⇒ TTL XOR gate is very suitable as LCO driver.
TRUE
FALSE

⇒ In Vidicon camera tube, the resistance of photoconductive material on the target plate
is constant
is more in darkness and less in brightness
is more in brightness but less in darkness and brightness
may be more or less in darkness and brightness

⇒ In a uniformly doped BJT, assume that N_E, N_B and N_C are the emitter, base and collector dopings in atoms/cm³, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following conditions is TRUE?
N_E = N_B = N_C
N_E >> N_B and N_B > N_C
N_E = N_B and N_B < N_C
N_E < N_B < N_C

⇒ The amount of dielectric heating is inversely proportional to frequency.
TRUE
FALSE

⇒ An angle modulated signal is expressed by f_a(t) = cos (2 x 10⁸ pt) + 75 sin (2 x 10³ pt). The peak frequency deviation of the carrier is
1 kHz
7.5 kHz
75 kHz
100 MHz

⇒ In the given figure the ratio T/d is the duty fac
TRUE
FALSE

⇒ When a substance is repelled by a magnetic field it is known as
ferromagnetic
antiferromagnetic
diamagnetic
paramagnetic

⇒

Assertion (A): Charge is dual of flux.

Reason (R): Short circuit is dual of open circuit.

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

⇒ In forward active region, the operation of a BJT
both junctions are forward biased
both junctions are reverse biased
emitter base junction is forward biased and base collector junction is reverse biased
emitter base junction is reverse biased and base collector junction is reverse biased

⇒ The dual of a link is
twig
node
loop
tree branch

⇒ The instruction LDA 20 in 8085 means
contents of memory location 20 are fetched into the accumulator
the value 20 is fetched into accumulator
either (a) or (b)
neither (a) nor (b)

⇒ A broadside array consisting of 200 cm wavelength with 10 half-wave dipole spacing 10 cm. And if each array element feeding with 1 amp. current and operating at same frequency then find the radiated power
730 W
73 W
100 W
None

⇒ Which of the following flip-flop do not have race problem?
T flip-flop
D flip-flop
JK flip-flop
Master-slave flip-flop

⇒ IC 74181 performs arithmetic operations when M = 1.
TRUE
FALSE

⇒ In a three input AND gate A = 1, B = 1, C = 0 The output Y =
ABC
ABC
ABC
ABC

⇒ A NOR gate has 3 inputs A, B, C. For which combination of inputs is output HIGH
A = B = C = 0
A = B = C = 1
A = B = 1 and C = 0
A = C = 1 and B = 0

⇒

Assertion (A): An encoder converts key dips to binary code.

Reason (R): An encoder has more inputs than output.

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

⇒ The circuit shown in figure, will act as an ideal current source with respect to terminals A and B, when frequenc
zero
1 rad/s
4 rad/s
16 rad/s

⇒ The inductance of a twin feeder used to connect antenna to TV receiver is about
0.2 μ H/m
0.6 μ H/m
1.6 μ H/m
10 μ H/m

⇒ When the phase velocity of an EM wave depends on frequency in any medium, the phenomenon is called
scattering
polarization
absorption
dispersion

⇒ In a three cavity klystron amplifier, the oscillations are excited in
input cavity
output cavity
intermediate cavity
both (a) and (b)