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Q1. | The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its |

A. | sensitivity [Wrong Answer] |

B. | attenuation [Wrong Answer] |

C. | selectivity [Correct Answer] |

D. | modulation [Wrong Answer] |

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Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Pulse modulation is often used in

microwave band

FL band

telegraphy

telephony

⇒ The number of cells in a 4 variable K map is

16

8

4

32

⇒ The velocity factor of a transmission line

mainly depends on the skin effect

is always higher for a solid dielectric than for air

mainly depends on the dielectric constant of the material used

increases the velocity along the transmission line

⇒ In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

decrease in the value of reactance

an increase in the value of reactance

no change in the reactance value

no change in the impedance value

⇒ Consider the following expressions in J

42, 40, 42 respectively

42, 42, 42 respectively

40, 42, 42 respectively

40, 40, 42 respectively

⇒ The voltage gain of an amplifier without and with feedback are 100 and 20. The negative feedback is

0.04

0.05

0.2

0.8

⇒ Some types of traps used in video IF amplifier of colour TV are

shunt traps

series traps

absorption traps

all of the above

⇒ A D-flip-flop is

dial type flip-flop

delay flip-flop

differential flip-flop

digital flip-flop

⇒ 268

_{10}= __________ .

10A

_{16}

10B

_{16}

10C

_{16}

10D

_{16}

⇒ AE 139 is a

tunnel diode

germanium power transistor

photoconductive cell

silicon diode

⇒ Let

*f*(A, B) = A ⊕ B; then the simplified form of the function

*f*(

*f*(

*x*⊕

*y*,

*z*)

*w*) is

(

*x*⊕

*y*⊕

*z*)

*w*

*x*⊕

*y*⊕

*z*⊕

*w*

(

*x*⊕

*y*⊕

*z*) +

*w*

none of these

⇒ In which of the following does a negative resistance region exist in the

*v*-

*i*characteristics?

PIN diode

Schottky diode

Tunnel diode

Zener diode

⇒ Calculate the directivity of a given linear end fire, uniform array of 20 element, each separated by λ/3

100

10

26.66

30

⇒ A FM signal with modulation index M

*is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of*

_{f}M

_{f}

M

*/2*

_{f}2M

_{f}

UM

_{f}

⇒ Which of the following parameters is negligible in transmission lines?

R

L

C

G

⇒ The conductivity of an intrinsic semiconductor is (symbols have the usual meanings).

generally less than that a doped semiconductor

σ

_{i}=

*en*

_{i}(μ

_{n}- μ

_{p})

σ

_{i}=

*en*

_{i}(μ

_{n}+ μ

_{p})

σ

_{i}=

*n*

_{i}(μ

_{n}- μ

_{p})

⇒ How many interrupts are there in 8085 microprocessor?

4

5

6

8

⇒ Which of the following statements is/are true for the diamond structure?

- Coordination number is four.
- Packing fraction is 0.34
- Copper crystallizes into diamond structure
- Lattice is FCC.

1 only

1, 2 and 4

2 and 3 only

2, 3 and 4

⇒ ICs are

analog

digital

both analog and digital

mostly analog

⇒ Is the interrupt-enable flag?

Low

High

Never

None

⇒ Let

*f*

_{1}(

*t*) = G

_{1}(

*t*) + 4,

*f*

_{2}(

*t*) = G

_{2}(

*t*) + 3. If G

_{1}(

*t*) and G

_{2}(

*t*) are uncorrected then the correlation between

*f*

_{1}(

*t*) and

*f*

_{2}(

*t*) are

12

7

6

zero

⇒ If two mutually exclusive events A and B can happen in

*m*and

*n*ways, then either

*A*or

*B*can happen in (

*m*+

*n*) ways.

TRUE

FALSE

⇒ Which one of the following is also called 'rat race'?

E plane tee

H plane tee

Magic tee

Hybrid ring

⇒ For a nonlinear resistance

*v*-

*i*plot is not a straight line

resistance increases as current increases

resistance decreases as current increases

current decreases as voltage increases

⇒ In figure, capacitor is uncharged. The switch is closed at

*t*= 0 at

*t*= 0

^{+}

*di*/

*dt100 A/s*

-100 A/s

1000 A/s

-1000 A/s

-100 A/s

1000 A/s

-1000 A/s

⇒

A-2, B-2, C-3

A-1, B-3, C-3

A-4, B-2, C-1

A-2, B-3, C-1

⇒ Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is

3

4

5

6

⇒ Consider the following statements as regards SAW filter

1, 2, 3, 4

1, 2, 3 only

1, 2, 4 only

2, 3, 4 only

⇒ Electrical contact materials used in switches, brushes and relays must possess

high thermal conductivity and high melting point

low thermal conductivity and low melting point

high thermal conductivity and low melting point

low thermal conductivity and high melting point

⇒ 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.

⇒

Match the following:

List I (Modulation ) | List II (Modulation Index) | ||
---|---|---|---|

A. | DSBFC | 1. | μ > 1 |

B. | DSBSC | 2. | μ > 0 |

C. | SSB | 3. | ∞ |

4. | μ, any value |

A-2, B-2, C-3

A-1, B-3, C-3

A-4, B-2, C-1

A-2, B-3, C-1

⇒ Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is

3

4

5

6

⇒ Consider the following statements as regards SAW filter

- The centre frequency is determined by the pitch of IDT comb shaped electrodes
- The response can be modified shaping the overlap of comb electrodes
- The response is maximum when acoustic wave has its wavelength equal to pitch
- When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin
*x*)/*x*

1, 2, 3, 4

1, 2, 3 only

1, 2, 4 only

2, 3, 4 only

⇒ Electrical contact materials used in switches, brushes and relays must possess

high thermal conductivity and high melting point

low thermal conductivity and low melting point

high thermal conductivity and low melting point

low thermal conductivity and high melting point

⇒ 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.