Question is ⇒ If f is the frequency of electromagnetic wave, fc is cutoff frequency, then in a rectangular waveguide, Options are ⇒ (A) attenuation is low when f > fc, (B) attenuation is low when f < fc, (C) attenuation is high when f < fc, (D) either (b) or (c), (E) , Leave your comments or Download question paper.

Question is ⇒ If f is the frequency of electromagnetic wave, fc is cutoff frequency, then in a rectangular waveguide, Options are ⇒ (A) attenuation is low when f > fc, (B) attenuation is low when f < fc, (C) attenuation is high when f < fc, (D) either (b) or (c), (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	If f is the frequency of electromagnetic wave, f_c is cutoff frequency, then in a rectangular waveguide
A.	attenuation is low when f > f_c [Correct Answer]
B.	attenuation is low when f < f_c [Wrong Answer]
C.	attenuation is high when f < f_c [Wrong Answer]
D.	either (b) or (c) [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 :

⇒ Which op-amp circuit uses a capacitor in series with input and resistance in feedback path?
Differentiating amplifier
Integrating amplifier
Logarithmic amplifier
None of the above

⇒ Among the digital IC families - ECL, TTL, and CMOS
ECL has the least propagation delay
TTL has largest fan out
CMOS has the lowest noise margin
TTL has the lowest power consumption

⇒ MICR stands for
Magnetic Ink Chart Receipt
Magnetic Ink Character Recognition
Magnetic Ink Chart Recognition
Magnetic Ink Character Receipt

⇒ In a step down chopper using pulse width modulation, T_on = 3 x 10^-3 and T_off = 1 x 10^-3 s. The chopping frequency is
333.33
250
500
1000

⇒ Decimal 18.29 when converted int 10's complement will become
81.7707
81.7
81.777
81.077

⇒ The most suitable method for detecting a modulated signal g(t) = (3 to 6 cos 2pf_mt) cos 2pf_ct is
envelope detector
synchronous detector
ratio detector
both a and b

⇒ If it is desired to have low output impedance in an amplifier circuit then we should use
common collector circuit
common base circuit
common emitter circuit
either (b) or (c)

⇒ In dc tacho generators used for measurement of speed of shaft, frequent calibration is necessary because
contacts wear off
strength of permanent magnet decreases with age
armature current produces heating effect
there is back emf

⇒ The trapezoidal pattern of figure is obtained when examining an AM wave by an oscilloscope. Modulation factor of the wave
0.33
0.5
2
1

⇒ The dynamometer principle can be used for
ammeter only
voltmeter only
wattmeter only
ammeter, voltmeter and wattmeter

⇒ In Pascal the repeat and while loops will terminate
only when the logical expression controlling the loop becomes true for both repeat and while loops
only when the logical expression controlling the loop becomes false for both repeat and while loops
only when the logical expression controlling the loop becomes true for repeat loop and false for while loop
only when the logical expression controlling the loop becomes false for repeat loop and true for while loop

⇒ The wave propagation occurs without attenuation in case of a
conductor
semiconductor
perfect dielectric
none of the above

⇒ How is an N-channel junction Field Effect Transistor operated as an amplifier?
With a forward bias gate source junction
With a reverse bias gate-source junction
With a open gate source junction
With a shorted gate source junction

⇒ In a series inverter
the commutating elements L and C are in parallel
the commutating elements L and C are in series with load
the commutating L and C may be in series or parallel with the load
none of the above

⇒ The input and output of a continuous time system are respectively denoted by x(t) and y(t) Which of the following descriptions corresponds to a causal system?
y(t) = x(t - 2) + x(t + 4)
y(t) = x(t - 4) + x(t + 1)
y(t) = x(t + 4) + x(t - 1)
y(t) = x(t + 5) + x(t + 5)

⇒ Consider the following stateme
1 only
1 and 2
2 and 3
2 and 4

⇒ Which of the following represents the equivalent circuit of a crystal for crystal oscilla
Figure A
Figure B
Figure C
None of the above

⇒ A quarter wave line short circuited at load end behaves as
an inductance
an inductance and capacitance in series
a capacitance
an inductance and capacitance in parallel

⇒ Two voltmeters 0-250 V each having resistances of 5 kΩ and 10 kΩ respectively and are connected in series. To ensure that neither of them goes beyond scale the total voltage which can be applied should be less than
500 V
400 V
375 V
250 V

⇒ Which of the following circuits cannot be demodulate SSB?
Product detector
Balanced modulator
Phase discriminator
BFO

⇒ A memory system of size 16 K bytes is required to be designed using memory chips having 12 address lines and 4 data lines-each. The number of such chips required to design and the memory system is :
2
4
8
16

⇒ A klystron amplifier generally uses Pierce gun
TRUE
FALSE

⇒ Which 8085 instruction causes exchange of contents of stack pointer with the contents of H L register pair?
XTHL
PCHL
LHLD
MVIA

⇒

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ T² e^-Ew/kT.

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 but R is false
A is false but R is true

⇒ In the CMOS inverter
one transistor is N channel and the other P channel
one is enhancement type and other depletion type
both are N channel with one enhancement and the other depletion type
none

⇒ A linear discrete time system has the char. equation z³ - 0.81z = 0, the system is
stable
marginally stable
unstable
stability cannot be assessed from the given information

⇒ MOSFET can be used as a
current controlled capacitor
voltage controlled capacitor
current controlled inductor
voltage controlled inductor

⇒ If the oscillator output is modulated by audio frequencies upto 10 kHz, the frequency range occupied by the side bands will be
711.9 kHz to 712.1 kHz
702 kHz to 722 kHz
692 kHz to 732 kHz
71.2 kHz to 71.20 kHz

⇒ A network has two branches in parallel. One branch contains impedance Z₁ and the other branch has impedance Z₂. If it is fed from an ac voltage V of frequency f, the current through Z₁ depends, on
V, Z₁, Z₂
V, Z₁
Z₁, Z₂
V, Z₁, f

⇒ As the temperature of semiconductor is increased
the average number of free charge carriers decreases
the average number of free charge carriers increases
the average number of free charge carriers remains the same
the average number of free charge carriers may increase or decrease