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Q1. | During day time ionosphere can be considered to be consisting of |

A. | D, E, F_{1} and F_{2} layers [Correct Answer] |

B. | D, E, F_{1} layers [Wrong Answer] |

C. | D, E, F_{2} layers [Wrong Answer] |

D. | D and E layers [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ In a multiphase chopper, the different choppers operate in

series and all simultaneously

parallel and one at a time

parallel and simultaneously

either (b) or (c)

⇒ A TV remote control works on the principle of

pulse code modulated ultra violet light

pulse code modulated infrared light

demodulation

either (a) or (b)

⇒ A source is delivering maximum power to a resistance through a network. The ratio of power delivered to the source power,

is always 0.5

may be 0.54 or less

may be 0.5 or less

may be 0.5 or more

⇒ Resistivity of metals is expressed in terms of

μ ohm

μ ohm/cm

μ ohm-cm

μ ohm-cm/°C

⇒ Consider the following symbols for arithmetic operators for integers

- +
- div
- mod
- /

1, 2 and 4 only

All

1, 2, 3 only

1 and 4 only

⇒ Find the FSV (full scale voltage) in a 6 bit R-2

*R*ladder D/A converter has a reference voltage of 6.5 V.

6.4 V

0.1 V

7 V

8 V

⇒ In a minimum function

the degree of numerator and denominator are equal

the degree of numerator and denominator are unequal

the degree of numerator is one more than degree of denominator

the degree of numerator is one less than degree of denominator

⇒ Ferrites have

low copper loss

low eddy current loss

low resistivity

higher specific gravity compared to iron

⇒ A number is expressed in binary 2's complement as 10011 decimal equivalent value is

19

13

-19

-13

⇒

`ALU 1C 74181`

can accept two words each having2 bits

4 bits

8 bits

16 bits

⇒ Number of fundamental cut-sets of any graph will be

same as the number of twigs

same as the number of tree branches

same as the number of nodes

equal to one

⇒ State variable formulation is very suitable for computer solution.

TRUE

FALSE

⇒ The circuit shown in the figure conv

BCD to Binary code

Binary to excess - 3 code

Excess - 3 to Gray

Gray to Binary

⇒ In the given figure the number of combinations of three non touching loop

0

1

2

3

⇒ In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half of the secondary winding is 30 V. Then PIV is

30 V

60 V

15 V

10 V

⇒ The analog signal

*m*(

*t*) is given below

*m*(

*t*) = 4 cos 100 p

*t*+ 8 sin 200 p

*t*+ cos 300 p

*t*, the Nyquist sampling rate will be

1/100

1/200

1/300

1/600

⇒ A FET has

very high input resistance

very low input resistance

high connection emitter junction

forward biased PN junction

⇒ In pulse width modulation of chopper

T is kept constant and T

_{on}is varied

T

_{on}is kept constant T is varied

both T and T

_{on}are varied

either T or T

_{on}is varied

⇒ The generic microprocessor contains a zero and a carry flag. These are located on

interrupt control

status register

either (a) or (b)

none of the above

⇒ For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

1000 MHz

5000 MHz

14000 MHz

140000 MHz

⇒ Temperature is analogous to

voltage

flux

charge

none of the above

⇒ The Boolean function A + BC is a reduced form of

AB + BC

(A + B) . (A + C)

AB + ABC

(A + C) . B

⇒ In a CD the channel separation is

1 μm

1.6 μm

2.5μm

4 μm

⇒ (FE35)

_{16}XOR (CB15)

_{16}is equal to

(3320)

_{16}

(FE35)

_{16}

(FF50)

_{16}

(3520)

_{l6}

⇒ In the circuit of figure the current through C at

*t*= &infin

0.166666666666667

2.5 A

3.1 A

0

⇒ If V

_{A}= - 10 V and V

_{B}= - 15 V, VAB = 5 V.

TRUE

FALSE

⇒ In the circuit, S was initially open. At time

*t*= 0, S is closed. When the current through the inductor is 6 A, the rate of change of current through the resistor is 6 A/s. The value of the inductor woul

1 H

2 H

3 H

4 H

⇒ The typical squelch circuit

cuts off IF amplifier when AGC is minimum

cuts off IF amplifier when AGC is maximum

cuts off audio amplifier when carrier is absent

eliminates RF interference when signal is weak

⇒ In the circuit of figure, PIV can be u

E

_{m}

2 E

_{m}

0.5 E

_{m}

2 E

_{m}

⇒ The characteristic equation of flip-flop gives the next state Q

_{N + 1}in terms of present state Q

_{N}and the inputs. Which one of the following is the characteristic equation of J - K flip-flop?

Q

_{N+1}= JQ

_{N}+ KQ

_{N}

Q

_{N+1}= J + KQ

_{N}

Q

_{N+1}= KQ

_{N}+ JQ

_{N}

Q

_{N+1}= K + JQ

_{N}