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Q1. | Considerable ionization occurs between the range |

A. | 50 km to 400 km [Correct Answer] |

B. | 100 to 400 km [Wrong Answer] |

C. | 50 km to 250 km [Wrong Answer] |

D. | 10 to 50 km [Wrong Answer] |

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

⇒

Match the following:

List I (DOS commands) | List II (Meaning) | ||
---|---|---|---|

A. | ATTRIB | 1. | Displays all directories and subdirectories |

B. | SCAN DISK | 2. | Moves files to another director |

C. | MOVE | 3. | Checks the status of disc |

D. | TREE | 4. | Hides a file |

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

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

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

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

⇒ In the given figure shows a logic circuit. The minimum Boolean expression for this circui

A + B

A + B + C

AB + C

AB + AC + BC

⇒ The accuracy of measurement by ohmmeter is very good.

TRUE

FALSE

⇒ In telephone systems the relation between load r, number of calls initiated during a specified interval λ and average duration of a call (

*h*) is

r = λ

*h*

r = λ

*h*

^{2}

λ = r

*h*

h = λr

⇒ Calculate the critical frequency for the E layer if maximum ionic densities are 3 x 10

^{6}

15.58 x 10

^{6}

15.58 kHz

1.58 x 10

^{3}

None of the above

⇒ Of the various capacitances associated with a junction transistor the gain bandwidth product is affected to maximum extend by

base collector parasitic capacitor

base collector space charge layer capacitance

base emitter space charge layer capacitance

base emitter diffusion capacitance

⇒ If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

double

one and a half time

3 times

4 times

⇒ It is required to increase the maximum range of a radar by a factor of two. The peak power transmitted in the radar system has to be increased by a factor of

2

4

8

16

⇒ A conductor has a cylindrical shape with a diameter

*d*. Its resistance is 2 Ω. It is recast into a cylindrical conductor of diameter 0.3

*d*. The resistance of new conductor is likely to be

less than 2 Ω

less than 0.6 Ω

between 2 and 100 Ω

more than 100 Ω

⇒ An ideal rectifier should have

100% efficiency, zero ripple factor, zero harmonic factor and unity displacement factor

100% efficiency, zero tipple factor, zero harmonic factor and zero displacement factor

100% efficiency, zero ripple factor, unity harmonic factor and unity displacement factor

100% efficiency, unity ripple factor, zero harmonic factor and unity displacement factor

⇒ Which of these is used in seven segment display?

PIN diode

LED

Photo diode

Tunnel diode

⇒ Consider an angle modulated si

10W

18W

20W

28W

⇒ Nichols chart consists of M and N locii in log magnitude versus phase diagram.

TRUE

FALSE

⇒ A coil has a designed for high Q performance at a rated voltage and a specified frequency. If the frequency of operation is doubled, and the coil is operated at the same rated voltage, then the Q factor and the active power P consumed by the coil will be affected as follows.

P is doubled, Q is halved

P is halved, Q is doubled

P remains constant, Q is doubled

P decreases 4 times, Q is doubled

⇒ In intrinsic semiconductor the increase in conductivity per degree increase in temperature is about

0.02

0.06

0.15

0.25

⇒ For measuring temperatures below 800°C with high accuracy, the best instrument is

optical pyrometer

thermistor based thermometer

GaAs junction diode thermometer

platinum resistance thermometer

⇒ Octal 16 is equal to decimal

13

14

15

16

⇒ For checking the parity of a digital word, it is preferable to use

AND gates

NAND gates

EX-OR gates

NOR gates

⇒

Match the following:

List I | List II | ||
---|---|---|---|

A. | RC coupled amplifier | 1. | Very low drift |

B. | Tuned amplifier | 2. | Flat frequency response from zero frequency onwards |

C. | Chopper stabilized amplifier | 3. | Flat frequency response with upper and lower cut off frequency |

D. | DC amplifier | 4. | Peak in gain frequency response |

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

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

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

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

⇒ The characteristic equation of an SR flip-flop in given by

Q

_{n+1}= S + RQ

_{n}Q

_{n+1}= RQ

_{n}+ SQ

_{n}Q

_{n+1}= S + RQ

_{n}

Q

_{n+1}= S + RQ

_{n}⇒ In equally tampered musical scale, an octave is divided into

12 intervals

10 intervals

7 intervals

5 intervals

⇒ Push pull amplifier is

voltage amplifier

current amplifier

power amplifier

none of the above

⇒ The measure of mismatch between the load and the transmission line is known as

directivity

Gain

standing wave ratio

reflection coefficient

⇒ If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if

*f*= 500 Hz, Δ

_{m}*f*= 2.25

6 kHz

12 kHz

27 kHz

54 kHz

⇒ In terms of classical representation of electrons

an atom is essentially empty

an atom is essentially full

an atom may be essentially empty or full depending on the material

an atom may be essentially empty or full depending on temperature

⇒ Which of the following figures is an ideal equivalent circuit of a n-p-n transis

figure A

figure B

figure C

none

⇒ The admittance parameter Y

_{12}in the 2 port network in the fi

-0.2 mho

0.1 mho

-0.05 mho

0.05 mho

⇒ An 8 bit transistor register has output voltage of low-high-low-high-low-high-low-high. The decimal number stored is

105

95

85

75

⇒

**Assertion (A):** In a full wave rectifier output the lowest ac component is at twice the input frequency

**Reason (R):** In a full wave rectifier, the output waveform consists of half sinusoids

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ A padder is basically a/an

insulator

variable resistor

capacitor

inductor