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The virtual height of an ionospheric layer is __________ true height | |
A. | equal to [Wrong Answer] |
B. | less than [Wrong Answer] |
C. | higher than [Correct Answer] |
D. | no relation [Wrong Answer] |
View Answer
Explanation:-
Answer : C Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ If the Q of a single stage single tuned amplifier is doubled, the bandwidth will
remain the same
become half
become double
become four times
⇒ Neutralization is used in RF amplifiers to
stop oscillation
increase bandwidth
improve selectivity
all of the above
⇒ Consider the CMOS circuit shown, where the gate voltage V_{G} of the n-MOSEFT is increased from zero, while the gate voltage of the p-MOSFET is kept constant at 3 V. Assume that, for both transistor, the magnitude of the threshold voltage is 1 V and the product of the transconductor parameter and the (W/L) ratio, i.e. the quality μC_{0x}(W/L), is 1mA. V^{-2Both the MOSFET are in saturation regionBoth the MOSFET are in triode regionn-MOSFET is in triode and p-MOSFET is in saturation regionn-MOSFET is in saturation and p-MOSFET is in triode region}
⇒ Consider the following logical IF statement in Fortran 77IF (SALT - PEPPER) 11, 11, 13
IF (SALT - PEPPER) 13, 11, 11
IF (SALT - PEPPER) 13, 13, 11
IF (SALT - PEPPER) 11, 13, 13
⇒ While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.
TRUE
FALSE
⇒ 1011_{2} x 101_{2} = __________ _{10}
55
45
35
25
⇒ The word size accessible at a time from the memory subsystem depends on
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both (b) and (c)
⇒ Advanced low power Schottky is a part of
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⇒ An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
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⇒ In C-language f- = 9 is equivalent to
f = -9
f = f - 9
f = 9 - 1
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⇒ Which of the following statements is/are true for a good conductor of electricity?
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⇒ The Fourier series of an odd periodic function contains
odd harmonics only
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⇒ In the vacuum diode equation i_{b} = ke_{b}^{1.5}, the current is
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⇒ In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually
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⇒ The normal operation of JFET is
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⇒ The A.C. resistance of the emitter diode will be
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⇒ M circles are symmetrical with respect to real axis.
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⇒ In 8085 microprocessor system, what will be the total delay provided by the following loop.3.154 msec
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⇒ Which of the following pairs of semiconductors and current carriers is correctly matched?
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⇒ The fuse material used in electrical lines must have which one of the following properties?
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⇒ The reflection coefficient on a line is 0.2 ∠45°. The SWR is
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⇒ Consider the Schmitt trigger circuit shown below. A triangular wave which goes from - 12 V to 12 V is applied to the inverting input of the op-amp. Assume that the output of the op-amp moves from +15 V to -15 V. The voltage at the non-inverting switches bet
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⇒ Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is
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⇒ The first pulse in a TV remote control is
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⇒ What is the characteristic of a good control system?
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⇒ The main function of a balanced modulator is to
produce balanced modulation of a carrier wave
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⇒ If B is the bandwidth, the thermal noise voltage is proportional to
B
B^{0.5}
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⇒ In the circuit of figure for sinusoidal input the waveform of the output will be as show
figure A
figure B
figure C
figure D
⇒ A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is
4
3
2
1
⇒ If the Q of a single stage single tuned amplifier is doubled, the bandwidth will
remain the same
become half
become double
become four times
⇒ Neutralization is used in RF amplifiers to
stop oscillation
increase bandwidth
improve selectivity
all of the above
⇒ Consider the CMOS circuit shown, where the gate voltage V_{G} of the n-MOSEFT is increased from zero, while the gate voltage of the p-MOSFET is kept constant at 3 V. Assume that, for both transistor, the magnitude of the threshold voltage is 1 V and the product of the transconductor parameter and the (W/L) ratio, i.e. the quality μC_{0x}(W/L), is 1mA. V^{-2Both the MOSFET are in saturation regionBoth the MOSFET are in triode regionn-MOSFET is in triode and p-MOSFET is in saturation regionn-MOSFET is in saturation and p-MOSFET is in triode region}
⇒ Consider the following logical IF statement in Fortran 77
IF (SALT - PEPPER) 13, 11, 11
IF (SALT - PEPPER) 13, 13, 11
IF (SALT - PEPPER) 11, 13, 13
⇒ While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.
TRUE
FALSE
⇒ 1011_{2} x 101_{2} = __________ _{10}
55
45
35
25
⇒ The word size accessible at a time from the memory subsystem depends on
width of data bus
width of address bus
width of control bus
both (b) and (c)
⇒ Advanced low power Schottky is a part of
ECL family
CMOS family
TTL family
none of the above
⇒ An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
25 A
12.5 A
less than 25 A
less than 12.5 A
⇒ In C-language f- = 9 is equivalent to
f = -9
f = f - 9
f = 9 - 1
-f = 9
⇒ Which of the following statements is/are true for a good conductor of electricity?
- Its conductivity decreases with increasing temperature.
- Number of free electrons is around 10^{28} m^{-3}.
- Its conductivity decreases with addition of impurities.
- It is a good conductor of heat also.
1, 2, 3 and 4
1 only
2 and 3 only
3 and 4 only
⇒ The Fourier series of an odd periodic function contains
odd harmonics only
even harmonics only
cosine harmonics only
sine harmonics only
⇒ In the vacuum diode equation i_{b} = ke_{b}^{1.5}, the current is
temperature limited current
space charge limited current
any of the above
none of the above
⇒ In asynchronous TDM, for n signal sources, each frame contains m slots, where m is usually
Less than n
2n
n
greater than 2n
⇒ The normal operation of JFET is
constant voltage region
constant current region
both constant voltage and constant current regions
either constant voltage or constant current region
⇒ The A.C. resistance of the emitter diode will be
5.05 Ω
50.5 Ω
505 Ω
5050 Ω
⇒ M circles are symmetrical with respect to real axis.
TRUE
FALSE
⇒ In 8085 microprocessor system, what will be the total delay provided by the following loop.
3.514 msec
2.644 msec
3.166 msec
⇒ Which of the following pairs of semiconductors and current carriers is correctly matched?
Intrinsic : number of electrons = number of holes
P type : number of electrons > number of holes
N type : number of electrons < number of holes
Bulk : neither electrons nor holes
⇒ The fuse material used in electrical lines must have which one of the following properties?
High resistivity
Low conductivity
High melting point
Low melting point
⇒ The reflection coefficient on a line is 0.2 ∠45°. The SWR is
0.8
1.1
1.2
1.5
⇒ Consider the Schmitt trigger circuit shown below. A triangular wave which goes from - 12 V to 12 V is applied to the inverting input of the op-amp. Assume that the output of the op-amp moves from +15 V to -15 V. The voltage at the non-inverting switches bet
-12 V and +12 V
-7.5 V and +7.5 V
-5 V and +5 V
0 V and 5 V
⇒ Minimum number of 2-input NAND gates required to implement the function F = (x + y) (Z + W) is
3
4
5
6
⇒ A network has 10 nodes and 17 branches. The number of different node pair are
7
9
10
45
⇒ The first pulse in a TV remote control is
start pulse
preliminary pulse
either start pulse or preliminary pulse
erase pulse
⇒ What is the characteristic of a good control system?
Sensitive to parameter variation
Insensitive to input command
Neither sensitive to parameter variation nor sensitive to input commands
Insensitive to parameter variation but sensitive to input commands
⇒ The main function of a balanced modulator is to
produce balanced modulation of a carrier wave
produce 100% modulation
suppress carrier signal in order to create a single-sideband or double sideband
limit noise picked by a receiver
⇒ If B is the bandwidth, the thermal noise voltage is proportional to
B
B^{0.5}
B^{1.5}
B^{2}
⇒ In the circuit of figure for sinusoidal input the waveform of the output will be as show
figure A
figure B
figure C
figure D
⇒ A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is
4
3
2
1