Question is ⇒ Which of the following antennas uses a number of varying length parallel elements?, Options are ⇒ (A) Helical antenna, (B) Pyramidal Horn, (C) Comer reflection antenna, (D) Yagi-Uda antenna, (E) , Leave your comments or Download question paper.

Question is ⇒ Which of the following antennas uses a number of varying length parallel elements?, Options are ⇒ (A) Helical antenna, (B) Pyramidal Horn, (C) Comer reflection antenna, (D) Yagi-Uda antenna, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Which of the following antennas uses a number of varying length parallel elements?
A.	Helical antenna [Wrong Answer]
B.	Pyramidal Horn [Wrong Answer]
C.	Comer reflection antenna [Wrong Answer]
D.	Yagi-Uda antenna [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 :

⇒ The voltage applied to an R-L circuit at t = 0 when switch is closed is 100 cos (100 t + 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?
0.0416666666666667
0.0833333333333333
0.208333333333333
0.416666666666667

⇒ Which of the following does not cause losses in optical fibre cables?
Stepped index operation
Impurities
Microbending
Attenuation in glass

⇒ In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t₁ < t < t₂. This indicates that during this interval
the input to the modulator is essentially constant
the modulator is going through slope overload
the accumulator is in saturation
the speech signal is being sampled at the Nyquist rate

⇒ In active filters inductances are divided because they
are always associated with same resistance
are bulky and unsuitable for miniaturization
are non linear
saturate quickly

⇒ Which of the following statements is non-executable in FORTRAN 77?
DO
ASSIGN
END
DIMENSION

⇒

Assertion (A): Negative feedback reduces the bandwidth of an amplifier

Reason (R): Negative feedback stabilizes the gain of an amplifier

Both A and R are correct and R is correct explanation for A
Both A and R are correct but R is not correct explanation for A
A is correct R is wrong
A is wrong R is correct

⇒ When a wave reaches an open circuit
the voltage at termination is doubled the incident voltage
the current at termination is doubled the incident voltage
the voltage at termination is zero
both V and I at termination are doubled the incident voltage and current

⇒ For a circular wave guide
cutoff frequency for TE₁₀ and TE₀₁ modes are same
cutoff frequency for TE₁₀ and TE₀₁ modes are different
cutoff frequency for TE₁₀ mode = twice the cutoff frequency for TE₂₀ mode
cutoff frequency for TE₁₀ mode = haf the cutoff frequency for TE₂₀ mode

⇒ The following circuit is implementation of:

sum of full adder

carry of half adder

difference of full subtractor

1 only
3 only
2 only
1 and 2 both

⇒ In a C expression using assignment operators, relational operators and arithmetic operators, the hierarchy of operations (in the absence of parenthesis) is
assignment, relational, arithmetic
relational, assignment, arithmetic
arithmetic, assignment, relational
arithmetic, relational, assignment

⇒ In a full wave diode rectifier circuit each diode carries current for
90° in each cycle
180° in each cycle
270° in each cycle
360° in each cycle

⇒ Tropospheric mode of propagation is used in
UHF
VLF
MF
HF

⇒ The total number of fundamental products of three variables is
3
5
8
16

⇒ In 8085 microprocessor, a RIM instruction is used to
disable the interrupts 7.5, 6.5, 5.5
enable the interrupts 7.5, 6.5, 5.5
read in the serial input data
none of the above

⇒ A very reliable service has to be established between two points on earth separated by 1000 km. The band that will be used as
MF
VHF
VLF
HF

⇒ Microprocessor 386SX is a 16/32 bit microprocessor. It has
16 bit registers and 32 bit data bus
16 bit registers and 16 bit data bus
32 bit registers and 32 bit data bus
32 bit register and 16 bit data bus

⇒ The pole zero plot in the given figure is
non-minimum phase function
minimum phase function
all pass function
either (a) or (b)

⇒ The number of categories in which registers are classified in μP are
2
3
4
5

⇒ If R(t) is autocorrelation of a waveform v(t) and R(0) is autocorrelation for t = 0, then
R(0) > R(t)
R(0) ≥ R(t)
R(0) < R(t)
R(0) ≤ R(t)

⇒ The input resistance R, of an ideal voltage amplifier is __________ and that of a current amplifier is __________ .
zero, zero
infinite, infinite
zero, infinite
infinite, zero

⇒ For plane wave propagating in free space or two conductor transmission line, what must be the relationship between the phase velocity v_p , the group velocity v_g and speed of light c?
v_p > c > v_g
v_p < c < v_g
v_p = c = v_g
v_p < v_g < c

Match the following:

	List I (Double Rectifier)		List II (Number of Diodes)
A.	Full wave Bridge rectifier	1.	1
B.	Half wave rectifier	2.	2
C.	Full wave rectifier using centre tapped transformer	3.	4

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

⇒ A push pull amplifier balance out
odd harmonics
even harmonics
both odd as well as even harmonics
neither odd nor even harmonics

⇒ A differentiating amplifier has capacitor in the input path.
TRUE
FALSE

⇒ The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.
0.1
1
2
0.5

⇒ The inputs to a 4 channel MUX have the following bandwidths. Channel 1-50 Hz, channel 2-200 Hz. Channel 3-75 Hz. Channel 4-90 Hz. The theoretical minimum sampling rate of the MUX is
200 Hz
400 Hz
415 Hz
1600 Hz

Assertion (A): Increasing the system gain improves steady state behaviour but may result in instability.

Reason (R): A compensator is inserted into a system to ensure specified performance.

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
R is correct but A is wrong

⇒ In a high frequency coaxial line and the length of line characteristic impedance is a function of
properties of insulating material only
inner and outer conductor radius only
both (a) and (b)
neither (a) nor (b)

⇒ In which of the following devices can the operation be visualised in terms of a series feedback loops?
TWT
Reflex klystron
Klystron amplifier
Backward wave oscillator

⇒ The number of gates in an SCR is
1
3
4
6