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Q1. | The currents fed to the two dipoles of turnstile antenna are |

A. | in phase [Wrong Answer] |

B. | in quadrature [Correct Answer] |

C. | in phase opposition [Wrong Answer] |

D. | either (a) or (c) [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ Square law modulators utilise

linear range of V-I characteristics of a diode

linear range of V-I characteristics of a triode

non-linear region of V-I dynamic characteristics of a diode

non-linear region of V-I dynamic characteristics of a triode

⇒ In 8085 microprocessor, what is the length of Data Buffer Register?

6 bits

8 bits

12 bits

16 bits

⇒ If

*f*be the signal frequency and

_{s}*f*be the intermediate frequency then image frequency is given by

_{i}*f*+

_{s}*f*

_{i}*f*±

_{s}*f*

_{i}*f*± 2

_{s}*f*

_{i}*f*+ 2

_{s}*f*

_{i}⇒ In a thyristor, the forward breakover voltage

is constant

may be constant or may depend on gate current

decreases as gate current is increased

increases as gate current is increased

⇒ The given figure shows a pole zero diagram. The transfer function G(

*j*1

0.5 ∠0

2.7 ∠- 31°

2 ∠45°

2 ∠- 67.4°

⇒ The carrier mobility in a semiconductor is 0.4 m

^{2}/Vs. Its diffusion constant at 300k will be (in m

^{2}/s).

0.43

0.16

0.04

0.01

⇒ If a two port network is represented by an equivalent T network, the impedance of shunt arm in terms of ABCD parameters is equal to

1/C

(A - 1)/C

1/B

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⇒ India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit.

geostationary

equatorial

polar

sun-synchronous polar

⇒ A receiver has poor selectivity. It will also have poor

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double spotting

blocking

diversity reception

⇒ According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when

the impedance of one of the networks is half that of the other

the impedance of one is the complex conjugate of the other

the impedance of one is equal to that of the other

none of the above

⇒ In a loss-free R-L-C circuit the transient current is

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square wave

sinusoidal

non-oscillating

⇒ Which of the following antennas uses a number of varying length parallel elements?

Helical antenna

Pyramidal Horn

Comer reflection antenna

Yagi-Uda antenna

⇒ In a vacuum triode μ =

*r*

_{p}

*g*

_{m}.

TRUE

FALSE

⇒ Two coupled coils have self inductance L

_{1}and L

_{2}. The coefficients of coupling is

*k*. The mutual inductance is

*k*L

_{1}L

_{2}

*k*

^{2}L

_{1}L

_{2}

*k*L

_{1}L

_{2}

*k*L

_{1}L

_{2}

⇒ When a unit step voltage drives a lag network the output

remains constant at unit step value

increases exponentially from zero to final value

decreases exponentially from 1 to 0

either (b) of (c) depending on values of R and C

⇒ For the logic circuit shown in figure, the simplified Boolean expression for the output

A + B + C

AB

B

C

⇒ Find R

_{AB2 Ω1.5 Ω3 ΩNone of the above}

⇒ In a 3 phase semiconverter, the output voltage becomes discontinuous for

firing angle > 30°

firing angle > 60°

firing angle > 90°

firing angle > 120°

⇒ The transfer function of a controller is given as K

_{p}+ K

_{d}.

*s*where K

_{p}and K

_{d}are constants. What type of controller is this?

Proportional

Proportional plus integral

Proportional plus derivative

Integral plus derivative

⇒ A bipolar transistor is a __________ controlled devices whereas a FET is a __________ controlled devices.

current, voltage

current, current

voltage, current

voltage, voltage

⇒ If transfer function of a system is H(

*z*) = 6 +

*z*

^{-1}+

*z*

^{-2}then system is

minimun phase

maximum phase

mixed phase

none

⇒ When a

*p*-

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diffuse through base into collector region

recombine with electrons in base

recombine with electrons in emitter

none of the above

⇒ A system with input

*x*[

*n*] and output

*y*[

*n*] is given as

*y*[

*n*] = (sin 5/6 p

*n*)

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*n*) The system is

linear, stable and invertible

non-linear, stable and non-invertible

linear stable, non invertible

linear, unstable, invertible

⇒ A counter has a modulus of 10. The number of flip flops is

10

5

4

3

⇒ For a hollow waveguide, the axial current must necessarily be

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conduction current only

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⇒ In a half bridge inverter each thyristor is gated at a frequency

*f*. The output frequency is

2

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*f*

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⇒ Which of the following amplifiers has highest output impedance?

CE

CB

CC

Push pull

⇒ In a Communication system, noise is most likely to affect the signal.

at the transmitter

In the channel

in Information source

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⇒ For an RC admittance function

all poles and zeros are simple

all poles and zeros are simple and lie on negative real axis

all poles and zeros lie on imaginary axis

all poles and zeros lie on positive real axis

⇒ Which of the following is not a data base function?

DAVERAGE

MAX

DCOUNT

DSTDEV