Question is ⇒ Which of the following is abnormal variation in ionosphere?, Options are ⇒ (A) Diurnal variation, (B) Seasonal variation, (C) Ionospheric storms, (D) None of the above, (E) , Leave your comments or Download question paper.

Question is ⇒ Which of the following is abnormal variation in ionosphere?, Options are ⇒ (A) Diurnal variation, (B) Seasonal variation, (C) Ionospheric storms, (D) None of the above, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Which of the following is abnormal variation in ionosphere?
A.	Diurnal variation [Wrong Answer]
B.	Seasonal variation [Wrong Answer]
C.	Ionospheric storms [Correct Answer]
D.	None of the above [Wrong Answer]
View Answer 2 -1 Explanation:- Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒

Assertion (A): Silicon is less sensitive to changes in temperature than germanium.

Reason (R): It is more difficult to produce minority carriers in silicon than in germanium.

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

⇒ The 54/74164 chip is an 8-bit serial-input-parallel-output shift register. The clock is 1 MHz. The time needed to shift a 8-bit binary number into the chip is
1 μs
2 μs
8 μs
16 μs

⇒ A two port network is symmetrical if
z₁₁ z₁₂ - z₁₂ z₂₁ = 1
AD - BC = 1
h₁₁ h₂₂ - h₁₂ h₄₁ = 1
y₁₁ y₂₂ = y₁₂ y₂₁ = 1

⇒ Which of the following is a vector quantity?
Standing wave ratio
Reflection coefficient
Gain
All of the above

⇒ Which of the following is not an integer constant?
2.3
156231
10
-256

⇒ Typical size of digital IC is about
1″ x 1″
2″ x 2″
0.1″ x 0.1″
0.001″ x 0.001″

⇒ The equivalent form of the logical expression (ABC + ABC + ABC + ABC + ABC) is:
C + (A ⊕ B)
(A + B + C)(A + B + C)
(A + B + C)(A + B + C)(A + B + C)
(A + B + C)(A + B + C)(A + B + C)

⇒ Which inverter circuit uses coupled inductors?
Modified McMurray full bridge inverter
McMurray Bedford half bridge inverter
Modified McMurray Bedford half bridge inverter
Both (b) and (c)

⇒ Magnetic amplifier is used for
voltage amplification
power amplification
current amplification
frequency amplification

⇒ A system is said to be static system, when present output depend upon
present I/P
presrent and past
present and future
past and future

⇒ In the series circuit shown in figure, for series resonance, the value of the coupling coefficient, K wil
0.25
0.5
0.1
1

⇒ The number of tightly bound electrons in silicon atom are
14
10
6
4

⇒ The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by
forward characteristics of thyristors
reverse recovery characteristics of thyristors
both forward and reverse recovery characteristics of thyristors
none of the above

⇒ The address to which a software or hardware restart branches is known as
Vector location
SID
SOD
TRAP

⇒ The open loop gain of an amplifier is 50 but likely to decrease by 20% due to various factors. If negative feedback with β = 0.1 is used, the change in gain will be about
0.2
0.02
0.005
0.0005

⇒ Consider a control system shown in given figure. For slight variation in G, the ratio of open loop sensitivity to closed loop sensitivity will be give
1 : (1 + GH)
1 : (1 + GH)^{- 1}
1 : (1 - GH)
1 : (1 - GH)^{- 1}

⇒ Which of the following logic no resistors are used?
CMOS
TTL
4 n sec ECL
8 sec ECL

⇒ RS latch can be built with
NOR gates
NAND gates
NOR or NAND gates
none of the above

⇒ In the absence of noise, if C is channel capacity in bits/s, δf is channel bandwidth in Hz and N is number of coding levels. Then
C = log₂ N
C = (δf) log₂ N
C = 2 (δf) log₂ N
C = 0.5 (δf) log₂ N

⇒ Which one is a non-causal system?
y(n) = x(2n)
y(n) = x(n/2)
y(n) = x(n/2) + x(n)
all

⇒

Assertion (A): Power drain of CMOS increases with operating frequency

Reason (R): All unused CMOS inputs should be tied either to a fixed voltage level (0 or V_DD) or to another input.

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 true, R is false
A is false, R is true

⇒ The z transform of sequence x[n] = {2, 4, 3, 2}
2z^-1 + 4z^-2 + 3 + 2z⁺¹
2z^-1 + 3 + 4z⁺¹ + + 2z⁺²
2z⁺¹ + 3z^-1 + 4z^-2 + 2z^-3
3 + 2z^-1 + 4z^-2 + 2z^-1

⇒ Insertion of a dielectric material between the plates of an air capacitor
increases the capacitance
decreases capacitance
has no effect an capacitance
increases breakdown voltage

⇒ Consider the following statements

The amplitude of an FM wave is constant
FM is more immune to noise than AM
FM broadcasts operate in upper VHF and UHF frequency ranges
FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments

Which of the above are correct?
1, 2, 3, 4
1, 2, 3
2, 3, 4
1, 3, 4

⇒ A system has 12 poles or 2 zeros. Its high frequency asymptote in its magnitude plot has slope of
-200 dB/decade
-240 dB/decade
-280 dB/decade
-320 dB/decade

⇒ In a class C operation
V_CC is much larger than V_CE(sat)
V_CC is much smaller than V_CE(sat)
V_CC and V_CE(sat) are nearly equal
none of the above

⇒ In broadside array
the principle direction radiation is perpendicular to the array axis and also to the plane containing the array elements
the principle direction radiation is parallel to the array axis and also to the plane containing the array elements
the principle direction radiation is parallel to the array axis and perpendicular to the plane containing the array elements
the principle direction radiation is perpendicular to the array axis and parallel to the plane containing the array elements

⇒ Zoning is used with a dielectric antenna in order to
permit pin-point focusing
reduce the bulk of the lens
increase the bandwidth of the lens
correct the curvature of the wavefront from a horn that is too short

⇒ The first contribution to logic was made by
George Boole
Copernicus
Aristotle
Shannon

⇒ In a microprocessor
all instructions need only one machine cycle
some instructions need only one machine cycle while some other instructions need more than one machine cycle
all instructions need only fraction of one machine cycle
some instructions need less than one machine cycle