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Q1. | The skip distance is the maximum distance upto which ionospheric reflection is possible. |

A. | TRUE [Wrong Answer] |

B. | FALSE [Correct Answer] |

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

⇒ Consider the following statements about DRAM

- Page mode read operation is faster than RAS read
- RAS input remains active during column address strobe
- The row and column addresses are strobed into the internal buffers using RAS and CAS inputs respectively

1 and 3 only

All

1 and 2 only

2 and 3 only

⇒ Which one of the following is true?

Alternating voltage and current contain odd and even harmonics

The inductance in a circuit reduces the effect of harmonics and makes current wave more sinusoidal than voltage wave

Alternating voltage and current waveforms, in general, do not contain odd harmonics

Inductance of a circuit does not alter wave shape at all

⇒ If

*f*(

*t*) = 1, F(

*j*ω) = 2p δ(ω).

TRUE

FALSE

⇒ To measure an unknown ac voltage by an ac potentiometer it is desirable that supply for the potentiometer is taken

from a battery

from a source which is not the same as unknown voltage

from the same source as the unknown voltage

either (a) or (b)

⇒

**Assertion (A):** Field emission is substantially independent of temperature.

**Reason (R):** When a high electric field is created at metal surface field emission may occur.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not a correct explanation of A

A is true but R is false

A is false but R is true

⇒ In a microprocessor the clock signal

is always generated internally

is always supplied externally

may be generated internally or supplied externally

is mostly supplied externally

⇒ When a voltage is applied to a semiconductor crystal then the free electrons will flow.

towards positive terminal

towards negative terminal

either towards positive terminal or negative terminal

towards positive terminal for 1 μs and towards negative terminal for next 1 μs

⇒ It is desired to evaluate the expression

`F = B * COS (Y) + C * SQR (COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

`F = B * COS (Y) + C * SQR [COS (Y)] + A * COS (Y) * SQR [COS (Y)]`

`F = B * COS (Y) + C * COS(Y) * COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

` X = COS(Y)`

⇒ RAM can be expanded to

increase word size

increase word number

either increase word size or increase word number

none of the above

⇒ If *x*^{k} = a^{k} and *k* &g

TRUE

FALSE

⇒ The phase angle characteristic in the given figure is

all pass function

transport lag

minimum phase function

none of the above

⇒ A half adder can be used only for adding

1 s

2 s

4 s

8 s

⇒ The number of key words in C is

4

8

16

32

⇒ In the Taylor series expansion of exp(*x*) + sin(*x*) about the point *x* = p, the coefficient of (*x* - p)^{2} is

exp (p)

0.5 exp (p)

exp (p) + 1

exp (p) - 1

⇒ If three cascaded stages of amplifier have gains 10, 20 and 30 the overall voltage will be

30

60

600

6000

⇒ Which has the lowest propagation delay time?

ECL

TTL

CMOS

PMOS

⇒ Out of Metal-film type and Carbon-film type, the one with better tolerance specification is

carbon-film

metal-film type

both have same tolerance

none of these

⇒ Wave A = 100 sin ω*t* and wave B = 100 cos ω*t*. Then

rms values of the two waves are equal

rms values of A is more than that of B

rms values of A is less than that of B

rms values of the two waves may or may not be equal

⇒ Match the following:

List I (F.T and F.S) List II (Properties) A. Fourier Series 1. Discrete, Periodic B. Fourier Transform 2. Continuous, Periodic C. Discrete Time Fourier 3. Discrete aperiodic D. Discrete Fourier Transform 4. Continuous, aperiodic

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

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

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

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

⇒ In a transmission line, losses due to dielectric heating are

proportional to voltage and inversely proportional to Z_{0}

proportional to voltage and proportional to Z_{0}

proportional to current and proportional to Z_{0}

proportional to current and inversely proportional to Z_{0}

⇒ The input to ALU are the contents of accumulator and temporary register.

TRUE

FALSE

⇒ Fields are said to be circularly polarized if

their magnitudes are equal

their magnitudes are equal and they differ in phase by ± 90°

their magnitudes are unequal and they differ in phase ± 90°

their magnitudes are unequal and they are in phase

⇒ Which of the following modes can exist in a rectangular waveguide?

TM_{10}

TE_{10}

TM_{00}

TM_{01}

⇒ Symbol shown in figure represen

Enhancement only N-channel MOSFET

UJT with *p*-type base

N-channel DMOSFET with internal protection

Phototransistor

⇒ Highest value of Autocorrelation of a function 100 cos 50 p*t* is

50

100

zero

100/p

⇒ An atom of a rare gas is placed is an electric field E. Then

the nucleus will be shifted in the direction of E by an amount which is proportional to E.

the nucleus will not be shifted.

the nucleus will be shifted in the direction of E by an amount which is independent of E.

the nucleus will be shifted in a direction opposite to that of E.

⇒ In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th_{1} and Th_{2} respectively

0 to p and p to 2p

a to p and p + a to 2p

a to p + a and p + p to 2p + a

a to p - a and p + a to 2p - a

⇒ The gain margin of first and second order systems is infinite.

TRUE

FALSE

⇒ In Modulation, "carrier" is

resultant wave

speech voltage to be transmitted

voltage with constant frequency, phase or amplitude

voltage for which frequency, phase or amplitude is varied

⇒ In the given figure the input frequency *f* = 0.1 (1/2 p

0 dB

3 dB

-3 dB

20 dB

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