Question is ⇒ Reflectors and lens antennas are commonly used, Options are ⇒ (A) in LF communication systems, (B) not beyond 100 kHz, (C) in the range 10 MHz to 100 MHz, (D) above 100 MHz, (E) , Leave your comments or Download question paper.

Question is ⇒ Reflectors and lens antennas are commonly used, Options are ⇒ (A) in LF communication systems, (B) not beyond 100 kHz, (C) in the range 10 MHz to 100 MHz, (D) above 100 MHz, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Reflectors and lens antennas are commonly used
A.	in LF communication systems [Wrong Answer]
B.	not beyond 100 kHz [Wrong Answer]
C.	in the range 10 MHz to 100 MHz [Wrong Answer]
D.	above 100 MHz [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 :

⇒ In figure, V_CC = + 30 V, R₁ = 200 kΩ and R₂ = 100 kΩ. If V_BE = 0.7 V, the voltage a cross R_{E+20 V
+19.3 V
+10 V
+9.3 V}

⇒ To convert JK flip flop to D flip flop
connect D to both J and K
connect D to J directly and D to K through inverter
connect D to K directly and D to J through inverter
connect D to K and leave J open

⇒ Since noise phase modulated FM wave, as the noise sideband frequency approaches the carrier frequency, the noise amplitude
is equalized
is increased
is decreased
remains constant

⇒

Assertion (A): SSB transmitter is generally smaller than AM transmitter

Reason (R): SSB systems mostly use combined transmitter receiver.

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 correct but R is wrong
A is wrong but R is correct

⇒ In a platinum RTD, the change in resistance for a temperature rise of 50° C is about
0.02
0.1
0.2
0.4

⇒ V_L = 100 cos (10t + 30&d
116.57 sin (10t - 29°) V
116.57 sin (10t + 29°) V
117.00 sin (10t - 29°) V
117.00 sin (10t + 29°) V

⇒ Which is known as flash converter?
Weighted resistor D/A converter
Parallel A/D converter
Stair step A/D converter
Up-down counter type A/D converter

⇒ For a BJT, under the saturation condition,
I_C = βI_B
I_C = aI_B
I_C is independent of all other parameters
I_C < βI_B

⇒ An antenna is 30 metre high. The frequency is 1 MHz. The radiation resistance is about
1500 Ω
150 Ω
15 Ω
1.5 Ω

⇒ The impulse response h(t) of a linear time-invariant continuous time system is described by h(t) = exp (at) u(t) + exp (βt) u (- t), where u(t) denotes the unit step function, and a and β are constants. This system is stable if
a is positive and β is positive
a is negative and β is negative
a is positive and β is negative
a is negative and β is positive

⇒ The hexadecimal number 5 F is equal to binary number
1010011
1011001
1010101
1011111

⇒ It is required that a strain gauge has gauge factor of 100. The proper strain gauge is
constantan strain gauge
nichrome strain gauge
semiconductor strain gauge
alloy strain gauge

⇒ In figure, i(t) is a unit step current. The steady state value of v(t
2 V
3 V
6 V
9 V

⇒ Two sinusoidal signals of same amplitude and frequencies 10 kHz and 10.1 kHz are added together. The combined signal is given to an ideal frequency detector. The output of the detector is
0.1 kHz sinusoidal
10.1 kHz sinusoidal
a linear function
a constant

⇒ A Weston synchronoscope is a
moving coils instrument
moving iron instrument
dynamometer instrument
induction instrument

⇒ Two 16 : 1 and one 2 : 1 multiplexers can be connected to form a
16 : 1 multiplexer
32 : 1 multiplexer
64 : 1 multiplexer
8 : 1 multiplexer

⇒ In the absence of noise, if C is channel capacity in bits/s, δf is channel bandwidth in Hz and N is number of coding levels. Then
C = log₂ N
C = (δf) log₂ N
C = 2 (δf) log₂ N
C = 0.5 (δf) log₂ N

⇒ For 8 bit representation the minimum positive and minimum negative numbers are
2^-128 each
2^-28 and 2^-127
2^-127 and 2^-128
2^-127each

⇒ Present day stereophonic systems have
only CD playback facility
only tape playback facility
both CD and tape playback facilities along with radio
none of the above

⇒ An amplifier has open loop gain of 100, input impedance 1 kΩ and output impedance 100 Ω. If negative feedback with β = 0.99 is used, the new input and output impedances are
10 Ω and 1 Ω
10 Ω and 10 kΩ
100 kΩ and 1 Ω
100 kΩ and 10 Ω

⇒ (1 2 1)_x = (1 0 0)₄ Then x is equal to
2
3
5
does not exist

⇒ A computer window has a bar at its top to bear the name of window. This bar is called
title bar
status bar
menu bar
control bar

⇒ The reason for glitches on the outputs of decoding gates on a synchronous counter is
FFs changing states together
FFs changing states one at a time
AND gates not functioning properly
none of the above

⇒ What does the operator ( ) mean in C?
Function expression
Array expression
Structure operator
Increment / Decrement

⇒ Am equivalent 2's complement representation of the 2's complement number 1101 is
110100
1101
110111
111101

⇒ A shadow zone does not receive any space wave
TRUE
FALSE

⇒ Dielectric materials have high specific resistance.
TRUE
FALSE

⇒ The input gate current of a FET is
a few amperes
a few milli amperes
a few micro amperes
negligible

⇒ If k denotes Boltzmann's constant, the rms value of thermal noise voltage is proportional to
k²
k
k
(k)^1/3

⇒

Assertion (A): JFET is a voltage controlled device.

Reason (R): The drain current can be controlled by controlling V_GS.

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