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Q1. | The most frequent users of long distance VLF transmission is |

A. | ship communication [Correct Answer] |

B. | radio broadcasting [Wrong Answer] |

C. | TV broadcasting [Wrong Answer] |

D. | telephone and telegraph [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ A radio frequency signal contains the following three frequencie

Push pull amplifier

Wideband amplifier

Audio frequency amplifier

Tuned voltage amplifier

⇒ Most of the communication satellites are stationed to the West of their service areas in order to reduce their

eclipse period

loss of power

battery power provision

mass of station-keeping fuel

⇒ For the polynomial

*P*(

*s*) =

*s*

^{5}+

*s*

^{4}+ 2

*s*

^{3}+ 2

*s*

^{2}+ 3

*s*+ 15 The number of roots which lie in the right half of the

*s*plane is :

4

2

3

1

⇒ BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are

*a, b, d*

*a, b, c*

all

*a, b, g, c, d*

⇒

Match the following:

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

A. | T (Reflection coefficient) = 0 | 1. | (Z_{L} - Z_{o})/(Z_{L} + Z_{o}) |

B. | T = - 1 | 2. | Z_{L} = Z_{o} |

C. | T = + 1 | 3. | Z_{L} = 0 |

D. | - 1 < T < + 1 | 4. | Z_{L} = ∞ |

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

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

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

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

⇒ A negative-feedback closed-loop system is supplied to an input 5 V. The system has a forward gain of 1 and a feedback gain of 1 and a feedback gain of 1. What is the output voltage?

1.0 V

1.5 V

2.0 V

2.5 V

⇒

**Assertion (A):** When a function *f*(*t*) is represented as exponential Fourier series, the set of complex coefficients F* _{n}* is called frequency spectrum of

*f*(

*t*)

**Reason (R):** Frequency spectrum is also called line spectrum.

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 circuit given bel

Circuit is band stop with two edge frequency of 39.7875 Hz to 1592 Hz

Circuit is band pass with two edge frequency of 39.7875 Hz to 1592 Hz

Circuit is oscillator, oscillation at two frequencies 39.7875 Hz to 1592 Hz depending on R

_{3}, R

_{4}, R

_{5}and R

_{6}

None of these

⇒ The integral of

*k*δ(

*t*) is

a step function of magnitude

*k*

a step function 'of magnitude 1/

*k*

a ramp of slope

*k*

a ramp of slope 1/

*k*

⇒ Which of the following exhibits negative resistance in a portion of its characteristics?

Tunnel diode

Zener diode

JFET

MOSFET and tunnel diode

⇒ A single phase semiconverter has a freewheeling diode. If the firing angle is a and the load is purely resistive, the periods of conduction and freewheeling respectively are

p - a and 0

p - a and a

p + a and 0

p + a and a

⇒ For a second order system, damping ratio ζ is such that 0 < ζ <. Then the roots of characteristic equation are

real but not equal

real and equal

complex conjugate

imaginary

⇒ The boolean expression for shaded area in the given figur

AB + AC

ABC + ABC

ABC + ABC

None of these

⇒ In 8085 microprocessor, how many lines are there in address bus?

6

8

12

16

⇒ A 1 ms pulse can be stretched to 1 sec pulse by using

an astable multivibrator

a monostable multivibrator

a bistable multivibrator

a Schmitt trigger circuit

⇒ The IF bandwidth of a radar receiver is inversely proportional to

pulse interval

pulse width

PRF

none of the above

⇒ Consider the following symbols

- Letters A to Z and a to z
- Digits 0 to 9
- Logical operators and, or, not
- Parenthesis ( )

1 and 2 only

1, 2 and 3 only

1, 2 and 4 only

All

⇒ If average correlation between

*v*

_{1}(

*t*) and

*v*

_{2}(

*t*) is R

_{12}(

*t*) and average correlation between

*v*

_{2}(

*t*) and

*v*

_{1}(

*t*) is R

_{21}(

*t*) then

R

_{12}(t) = R

_{21}(t)

R

_{21}(t) = R

_{12}(t)

R

_{12}(t) = - R

_{21}(t)

none of these

⇒ Which one of the following is true?

Characteristic impedance of twin wire feeder and coaxial cable are nearly the. same

The characteristic impedance of coaxial cable is more than that of twin wire cable

The characteristic impedance of twin wire cable is more than that of coaxial cable

The characteristic impedance of a twin wire feeder may be more or less than that of coaxial cable

⇒ For a delayed half wave rectified wave, the average and rms values are lower than those for half wave.

TRUE

FALSE

⇒ Fermi level in intrinsic semiconductor is at the centre of forbidden energy band.

TRUE

FALSE

⇒ The first contribution to logic was made by

George Boole

Copernicus

Aristotle

Shannon

⇒ A combination circuit is one in which the output depends on

input combination at that time

input combination and previous output

input combination and previous input

present output and previous output

⇒ A lossless 50 Ω transmission line is terminated 30 +

*j*25 Ω, then voltage reflection coefficient and current reflection coefficient are

062 ∠82.88, - 0.62 ∠82.88

10.36 ∠11.296, - 10.36 ∠111.296

0.23 ∠49.1, - 0.23 ∠ + 49.1

- 10.36 ∠111.296, 10.36 ∠111.296

⇒ The I/P impedance of a short circuited quarter wave long transmission line is

purely reactive

purely resistive

depend on the characteristic impedance of the line

none of the above

⇒ The parameter β of a BJT change by 300%. If self bias is used in the amplifier using this BJT, the quiescent value of I

_{C}and V

_{CE}remain almost the same.

TRUE

FALSE

⇒ If a fuse is higher than required current rating is employed in a circuit, it will

blow more frequently since it carries more current

afford better protection to the circuit

seriously overload the circuit

lead to larger maintenance cost

⇒ The total number of leads in MOS controlled thyristor is

2

3

4

2 or 3

⇒

**Assertion (A):** A class C amplifier is a timed amplifier which needs a tank circuit as the load in the collector circuit of the transistor for its proper operation

**Reason (R):** In class C operation collector current flows for less than 180° of the ac cycle and thus flows in pulses

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

⇒ The fourier transform of the half cosine pulse as shown below is _______

0.5 {sin [0.5(

*f*- 1)] + sin [0.5 (

*f*+ 1)]}

0.25 [sin c[0.25 (

*f*- 2)1 + sin c[0.25(

*f*+ 2)]]

0.5 {sin c [0.5 (

*f*- 1)] + sin c [0.5 (

*f*+ 1)]}

sin c(

*f*- 0.5) + sin c (

*f*+ 0.5)