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Q1. | The effective refraction index of the ionosphere for radio wave is |

A. | more than unity [Wrong Answer] |

B. | less than unity [Correct Answer] |

C. | equal to unity [Wrong Answer] |

D. | either more or less than unity depending on the electron concentration [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ IC 74181 performs arithmetic operations when M = 1.

TRUE

FALSE

⇒ If A = 10 +

*j*then log

_{e}A is

14.14 ∠45°

200 ∠45°

2.65 +

*j*45°

2.65 +

*j*0.785

⇒ A voltage doubler circuit uses

two diodes

two capacitors

two diodes and two capacitors

none of the above

⇒ A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10

^{-6}F capacitor in the other. At resonance frequency, the dynamic resistance is

10 Ω

100 Ω

1000 Ω

10000 Ω

⇒ A communication channel with additive white Gaussian noise, has a bandwidth of 4 kHz and an SNR of 15. Its channel capacity is

1.6 kbps

16 kbps

32 kbps

256 kbps

⇒ The voltage induced in a loop of wire rotating in a strong and steady magnetic field is

pulsating dc

dc

rectified ac

ac

⇒ Find R

_{TH}across the terminals A a

52.28 Ω

58.28 Ω

52.82 Ω

58.82 Ω

⇒ The efficiency of a horn speaker is about

0.1

0.4

0.6

0.8

⇒ ALU processes

decimal numbers

binary numbers

hexadecimal numbers

all of the above

⇒ What is the memory word size of 8085 μp?

6 bits

8 bits

12 bits

16 bits

⇒ As compared to full wave rectifier, a half wave rectifier

has higher ripple factor

has lower ripple factor

may have higher or lower ripple factor

has same ripple factor

⇒

Match the following:

List I (Devices) | List II (characteristic) | ||
---|---|---|---|

A. | BJT | 1. | Voltage controlled negative resistance |

B. | MOSFET | 2. | High current gain |

C. | Tunnel diode | 3. | Voltage regulation |

D. | Zener diode | 4. | High input impedance |

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

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

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

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

⇒ In a single stage differential amplifier, the output offset voltage is mainly dependent on the mismatch of

V

_{BE}, I

_{B}and β

V

_{BE}and I

_{B}

I

_{B}and β

V

_{BE}and β

⇒ Due to the formation of Schottky defects the density of the crystal

increases slightly

increases appreciably

decreases slightly

decreases appreciably

⇒ In a CRO, the time base signal is applied to

X plates

Y plates

either X or Y plates

alternately X and Y plates

⇒ The Y plates of a CRO are excited by a voltage 2 sin 100

*t*and the X plates are not connected. The display would be

a vertical line

a horizontal line

sine wave

slant line

⇒ A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is

half

doubled

increase by 4 times

no change

⇒

**Assertion (A):** The sign and magnitude of displacement can be measured by an LVDT.

**Reason (R):** LVDT is based on the principle of mutual inductance.

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

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

A is true R is false

A is false R is true

⇒ If H(

*s*) is positive real, 1/H(

*s*)

is positive real

is not positive real

may or may not be positive real

must possess some other properties also if it is to be positive real

⇒ In carbon resistor colour code, the third band is red. It indicates

two zeros

three zeros

multiplier is 0.01

multiplier is 0.1

⇒ Consider the program segment written for 8085 based sys

41

69

44

Indeterminate

⇒ In the circuit, shown the current I marked is give

2.22 A

1.78 A

4.44 A

0.0833333333333333

⇒ The expression given is F(A, B, C, D, E, F, G, H) = Σ(33, 48, 102, 158, 222, 229, 233, 243, 255); then the __________ and __________ minterms are grouped together into dual and variable __________ is reduced using the dual

243, 233, D

222, 158, B

243, 255, A

229, 243, E

⇒ The function in the given figure can be writte

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4) -

*u*(

*t*- 6) sin p (

*t*- 6)

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin p (

*t*- 1) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin 2p (

*t*- 1) +

*u*(

*t*- 4) sin 2p (

*t*- 4)

⇒ In MF range, increasing the transmitter power

increases the range of transmitter

does not increase the range of transmitter because propagation is limited by tilt

decreases the range of transmitter because propagation is limited by tilt

increases the range of transmitter because propagation is through space waves

⇒ Polarization is a measure of

dielectric constant per unit volume

voltage gradient to produce electrical breakdown

product of charge and distance

excess charge density

⇒ The passage of current in an electrolyte is due to the movement of

electrons

molecules

atoms

ions

⇒ A transistor has a maximum power dissipation of 350 mW at an ambient temperature of 25°C. If derating factor is 2 mW/°C, the maximum power dissipation for 40°C ambient temperature is

300 mW

330 mW

350 mW

380 mW

⇒ Neper is

larger than a decibel

smaller than decibel

equal to 1 decibel

none of the above

⇒ In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of

120°

60°

240°

any of the above