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Q1. | A Yagi antenna has a driven antenna |

A. | only [Wrong Answer] |

B. | with a reflector [Wrong Answer] |

C. | with one or more directors [Wrong Answer] |

D. | with a reflector and one or more directors [Correct Answer] |

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

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | 45 | 1. | 10110100 |

B. | 90 | 2. | 11010010 |

C. | 180 | 3. | 01011010 |

D. | 210 | 4. | 00101101 |

5. | 10101000 |

A-3, B-4, C-5, D-2

A-4, B-3, C-5, D-2

A-4, B-3, C-1, D-2

A-3, B-4, C-2, D-1

⇒ In a cycloconverter it is possible to vary

only output frequency

only output voltage

both output voltage and frequency but not simultaneously

both output voltage and output frequency simultaneously

⇒ The range of life time carriers (electrons and holes) is

1 μ

*s*to 100 μ

*s*

1 nano sec to 1 μ

*s*

1 nano sec to hundreds of μ

*s*

none of the above

⇒ A two branch parallel tuned circuit has a capacitance C in one of the two branches and resistance R in second branchs. As C is decreased the dynamic resistance

increases

decreases

remains constant

may increases or decreases

⇒ Which of the following statement about the amplitude limiter is not valid?

Leak type bias must be used

Output must be tuned

The circuit is always biased in class

*C*, by virtue of the leak type bias

When the input increases past the threshold of limiting, the gain decreases to keep the output constant

⇒ With regard to a transmission line, which of the following statements is correct?

Any impedance repeats itself every 1/4 on the Smith chart.

The S.W.R. = 2 circle and the magnitude of reflection coefficient = 0.5 circle coincide on the Smith chart.

At any point on a transmission line, the current reflection coefficient is the reciprocal of the voltage reflection coefficient.

Matching eliminates the reflected wave between the source and the matching device location.

⇒ Δ

^{2}V = - r/E is known as __________ equation

Poisson

Fourier

Laplace

Maxwell

⇒

**Assertion (A):** Peak to peak value of a sinusoidal wave is 2.828 times the rms value.

**Reason (R):** Peak factor of a sinusoidal wave is 1.414.

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

⇒ The multiplier resistance and meter coil in a voltmeter are in

series

parallel

series-parallel

either (a) or (b)

⇒ In the given circuit, the switch has been in position 1 for quite a long time. At

*t*= 0 the switch is moved to position 2. At this position what is the time const

0.1 s

1 s

0.11 s

1.11 s

⇒ In an LC filter, the ripple factor,

increases with load current

increases with load resistance

remains constant with the load current

has the lowest value

⇒ In cell phone antennas are

monopole

loops

helical

lens

⇒ In an hydrogen atom, an electron moves in the field of a proton. The stability of orbit requires equilibrium between coulomb's force and centrifugal force.

TRUE

FALSE

⇒ Which of the following is the ferric electric material?

Rochelle salt

Barium titanate

Potassium dihydrogen phosphate

All 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

⇒ Which of the following represents a stable system?

- Impulse response decreases exponentially.
- Area within the impulse response in finite.
- Eigen values of the system are positive and real.
- Roots of the characteristic equation of the system are real and positive.

1 and 4

1 and 3

2, 3 and 4

1, 2

⇒ The operator precedence in Java is in the order

arithmetic operation, increment and decrement operation, comprassion, logical operation and assignment operation.

increment and decrement operation, arithmetic operation, comparison, logical operation and assignment operation.

comparison, arithmetic operation, increment and decrement operation, logical operation and assignment operation.

arithmetic operation, comparison operation, increment and decrement operation, logical operation and assignment operation.

⇒ In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is

1

2

3

4

⇒ A single phase half wave rectifier is feeding a resistive load. As firing angle is increased

dc output voltage and rms output voltage decrease in the same proportion

dc output voltage and rms output voltage decrease

dc output voltage and rms output voltage increase

dc output voltage and rms output voltage increase in the same proportion

⇒ The resistance of a 230 V, 100 W lamp is

529 Ω

2300 Ω

5290 Ω

23 Ω

⇒ As compared to TTL, CMOS logic has

higher speed of operation

higher power dissipation

smaller physical size

all of the above

⇒ An FM transmitter delivers 80W to a load of 30 W when no modulation is present. The carrier is now frequency modulated by a single sinusoidal signal and the peak frequency deviation is so adjusted to make the amplitude of the second sideband is zero in the given out

5.12 W

21.78 W

2.56 W

16.81 W

⇒ A gate function which occurs at

*t*=

*t*

_{0}and lasts for duration T can be written as

*u*(

*t*-

*t*

_{0}- T)

*u*(

*t*-

*t*

_{0}) =

*u*(

*t*-

*t*

_{0}- T)

*u*(

*t*-

*t*

_{0}) -

*u*(

*t*-

*t*

_{0}- T)

*u*(

*t*-

*t*

_{0}) -

*u*(

*t*-

*t*

_{0}+ T)

⇒ A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are

a < ω

*t*< p and p < ω

*t*< (2p + a)

a < ω

*t*< p and p < ω

*t*< 2p

a < ω

*t*< (p + a) and (p + a) < ω

*t*< 2p

a < ω

*t*< p and p < ω

*t*< (2p - a)

⇒ In a picture tube, the video signal is applied to

cathode

grid

any anode

either cathode or grid

⇒ In the graphical analysis of an amplifier circuit, the slope of dc load line depends on

load resistance only

collector supply voltage only

both load resistance and collector supply voltage

none of the above

⇒ For stable network, the real part of poles and zeros of driving point function must be

negative

negative or zero

zero

positive

⇒ According to Siegel and Labus, antenna can be treated as

closed transmission line

shorted transmission line

earthed transmission line

opened-out transmission line

⇒ As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r

_{i}+

*a*T, where r

_{i}and

*a*are constants and T is absolute temperature. At very low temperatures

*a*T = 0

*a*T > r

_{i}

*a*T ∼ r

_{i}

*a*T < r

_{i}

⇒ In a N-P-N transistor, when emitter junction is forward biased and collector junction is reverse biased the transistor will operate in

active region

saturation region

cut-off region

inverted region