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Q1. | Which of the following statement is false? |

A. | A half-wave dipole is a resonant antenna [Wrong Answer] |

B. | A horizontal antenna transmits radio signal with horizontal polarization [Wrong Answer] |

C. | The field strength of 200 mV/m will produced 200 μV of signal in an antenna 2 m long [Correct Answer] |

D. | All of the above [Wrong Answer] |

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

⇒ The realization of a reactance function gives

a network having inductances only

a network having capacitances only

a network having resistances only

a network having inductances and capacitances only

⇒ A (75 -

*j*50) Ω load is connected to a coaxial line of Z

_{0}= 75 Ω at 10 GHz. The best method of matching consists of using

a capacitance at some specific distance from load

a short circuited stub at some specific distance from load

an inductance at load

a short circuited stub at load

⇒ A discrete LTI system is non-casual if its impulse response is

*a*

*∪(*

^{n}*n*- 2)

*a*

*∪(*

^{n-2}*n*)

*a*

*∪(*

^{n+2}*n*)

*a*

*∪(*

^{n}*n*+ 2)

⇒ As the frequency is increased, the charging MVAR in a cable

decreases

increases

remain the same

decreases or remains the scheme

⇒ Negative feedback reduces noise originating at the amplifier input.

TRUE

FALSE

⇒ In a CE amplifier the dc load line is the same as ac load line when

ac collector resistance and dc collector resistance are equal

ac collector resistance and dc emitter resistance are equal

ac collector resistance is very high

ac collector resistance is one half of dc collector resistance

⇒ (2)

_{3}+ (3)

_{4}= (?)

_{5}

4

11

none of these

not possible

⇒ 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}

⇒

**Assertion (A):** A PROM is a user programmable ROM.

**Reason (R):** After programming PROM behaves like ROM.

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 R is wrong

A is wrong R is correct

⇒ The current wave shown in figure is applied by a 0.1 F capacitor at

*t*= 0. At

*t*= 0

^{+}, the voltage across capacito

0

4 V

10 V

20 V

⇒ A periodic voltage

*v*(

*t*) = 1 + 4 sin ω

*t*+ 2 cos ω

*t*is applied across a 1 ohm resistance. The power dissipated is

1 W

11 W

21 W

24.5 W

⇒ Two voltages are -5 V and -10 V. In positive logic

-5 V is 1 and -10 V is 0

-10 V is 1 and -5 V is 0

-5 V is 1 in some circuits and 0 in others

-10 V is 1 in some circuits and 0 in others

⇒ Which of the following can be used to convert PPM into PWM?

Integrator

Astable multivibrator

Bistable multivibrator

Monostable multivibrator

⇒ The power dissipated per gate

is constant at all frequencies

increases with frequency

decreases with frequency

may increase or decrease with frequency

⇒ The primary constants of a transmission line are

R and L

R, L and C

R and C

R, L, G and C

⇒

Match the following:

List I (Logic family) | List II (Characteristic) | ||
---|---|---|---|

A. | TTL | 1. | Maximum power consumption |

B. | ECL | 2. | Highest packing density |

C. | NMOS | 3. | Least power consumption |

D. | CMOS | 4. | Saturated Logic |

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

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

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

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

⇒ In a CE amplifier circuit the load resistance is open circuited. The output voltage will

increase

decrease

become zero

increase or decrease

⇒ A circuit is replaced by its Thevenin's equivalent to find current through a certain branch. If V

_{TH}= 10 V and R

_{TH}= 20 Ω, the current through the branch

will always be 0.5 A

will always be less than 0.5 A

will always be equal to or less than 0.5 A

may be 0.5 A or more or less

⇒ The polar plot for positive frequencies is shown below. The gain margi

- 8.02 dB

6.02 dB

5 dB

none of these

⇒ The mean life time of the minority carriers is in the range of a few

seconds

milli seconds

micro seconds

nano seconds

⇒ The current in a circuit is measured using a 150 : 1 CT If the ammeter reads 0.6 A, the circuit current is

250 A

90 A

156 A

144 A

⇒ In an AM system, doubling of modulation index doubles the antenna current. The system is

single side band full carrier

vestigial side band

single side band suppressed carrier

double side band full carrier

⇒ Find the value of K and velocity constant K

*so that the maximum overshoot in the unit step response is 0.2 and the peak time is 1*

_{v}12.37, 0.175

12.86, 2.175

11.36, 1.175

1.86, 0.175

⇒ The fluctuation in the received signal strength at the receiver of a random variation in the received signal is known as

fluctuation

fading

absorption

cycling

⇒ Consider the expression

*b*=

*acd*(

*xz*). The correct C statement for above expression is

*a c d*(

*x**

*z*)

*a**

*c**

*d** (

*x z*)

*a**

*c**

*d*(

*x**

*z*)

None of the above

⇒ Binary storage of decimal number 44 in 8 bits is

101100

10101100

10101101

101101

⇒ Radiation efficiency of an antenna is defined as the ratio of

Total power radiated by an antenna to the net power accepted by the antenna from the connected transmitter

The frequency at which minimum power is radiated to the frequency at which maximum power is radiated

Total power accepted from the transmitter to total power generated by the transmitter

Power in main lobe to that in the side lobe

⇒ A moving iron instrument gives correct reading when used at

low frequencies

high frequencies

only one frequency

all frequencies upto a certain value

⇒ Acoustic strain gauges

have good linearity of measurement

do not have long term stability

have a large range of measurement

have an accuracy range of 0.1-1% depending on environment

⇒ The following sequence represents autocorrelation of a real valued signal. The energy of real valued sequence is given by __________

*x(n)*= {1, _, 3, _, 5, _, 7, _, 9, 10, _, 8, _, 6, _, 4, _, 2

2[1

^{2}+ 2

^{2}+ 3

^{2}+ 4

^{2}+ 5

^{2}+ 6

^{2}+ 7

^{2}+ 8

^{2}+ 9

^{2}] + 10

^{2}

10

10

^{2}

2[1

^{2}+ 2

^{2}+ 3

^{2}+ 4

^{2}+ 5

^{2}+ 6

^{2}+ 7

^{2}+ 8

^{2}+ 9

^{2}+ 10

^{2}]