Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | A radio station works at 800 kHz and uses AM. If this is a public broadcast system, it should transmit using |

A. | parabolic reflector to transmit all round [Wrong Answer] |

B. | turnstile antenna for the required land [Wrong Answer] |

C. | half wave long horizontal wave [Wrong Answer] |

D. | a vertical antenna less than quarter for practical reasons [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ Which one of the following is not a useful quantity for comparing the noise performance of receivers?

Noise figure

Noise temperature

Input noise voltage

Equivalent noise resistance

⇒ The race condition in NOR SR latch occurs when

S = R = 1

S = 0, R = 1

S = 0, R = 0

S = 1, R = 0

⇒ A cycloconverter is

ac-dc converter

dc-ac converter

dc-dc converter

ac-ac converter

⇒

Match the following:

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

A. | Continuous and aperiodic | 1. | Fourier representation is continuous and aperiodic |

B. | Continuous and Periodic | 2. | Fourier representation is discrete and aperiodic |

C. | Discrete and aperiodic | 3. | Fourier representation is continuous and periodic |

D. | Discrete and periodic | 4. | Fourier representation is discrete and periodic |

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

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

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

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

⇒ Consider the following operation in a computer

- Multiplication of scalar
- Iversion of matrix
- Printing a line of 120 characters on a printer

1 and 2 only

1 and 3 only

1, 2 and 3

2 only

⇒ 74 HC series can sink upto 4 mA. The 74 LS series has I

_{IL(max)}- 0.4 mA. How many 74 LS inputs be driven by 74 HC output?

100

none

8

10

⇒ When an ac circuit has sources of different frequencies, the only method of analysis is superposition theorem.

TRUE

FALSE

⇒ 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

⇒ An amplifier operating over a frequency range of 18 to 20 MHz has 10 kΩ input resistance. At a temperature of 27° C, the noise voltage at input of amplifier is (Boltzman constant

*k*= 1.38 x 10

^{-23}J/K)

18.2 μV

182 μV

16.2 μV

162 μV

⇒ The number of days when Earth's shadow falls on a geosynchronous satellite is

88

277

5

10

⇒ The current through a 1 mH inductance is

*i*(

*t*) = 2.56 x 10

^{-2}- 4 x 10

^{3}

*t*for 2 ≤

*t*≤ 20 μ sec. The voltage across the inductor is

4

8

0

8 x 10

^{3}

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

TRUE

FALSE

⇒ If E (i.e., available energy state) = E

_{F}(i.e., Fermi level), then probability that state E will be occupied is 0.5 for any temperature T.

TRUE

FALSE

⇒ The depletion layer across a P

^{+}

*n*junction lies

mostly in the P

^{+}region

mostly in

*n*region

equally in both the P

^{+}and

*n*-region

entirely in the P

^{+}region

⇒ A coaxial RF cable has a characteristic impedance of 50 Ω and C equal to 40 pF/m. The inductance is

1 μ H/m

10 μ H/m

0.1 μ H/m

0.01 μ H/m

⇒ An RL series circuit has an impedance of 20 Ω when frequency is 25 Hz. At

*f*= 50 Hz, the impedance will be

40 Ω

20 Ω

less than 40 W but more than 20 Ω

less than 20 W but more than 10 Ω

⇒ The network of the given figure

lag network

lead network

lag-lead network

any of the above

⇒ The compensator in the given figure

lag compensator

lead compensator

lag-lead compensator

none of the above

⇒ In TTL the transistors are driven into and out of saturation.

TRUE

FALSE

⇒ If a line is terminated in characteristic impedance Z

_{0}, the input impedance measured at the input will be

Z

_{0}

Z

_{0}/2

Zero

infinite

⇒ Which of the following are the memory performance parameters?

- Access time and latency
- Block size and Block access time
- Cycle time and Bandwidth

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

⇒ In the circuit of figure the current through C at

*t*= &infin

0.166666666666667

2.5 A

3.1 A

0

⇒ The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by

RL network only

RC network only

LC network only

RC as well as RL network

⇒ In the circuit of figure, the waveshape of load current when thyristor conducting

constant

increasing exponentially

decreasing exponentially

either (b) or (c)

⇒ PAM stands for

Phase Angle Modulation

Phase Amplitude Modulation

Pulse Amplitude Modulation

Pulse Angle Modulation

⇒ In energy band diagram of

*n*type semiconductor, the donor energy level is

in valence band

in conduction band

slightly above valence band

slightly below conduction band

⇒ A quantization error is an essential aspect of ADC

TRUE

FALSE

⇒ Both X and Y plates of a CRO are excited by ac signals. The display is an ellipse which makes one rotation in 5 seconds. This means that

the frequency of one input is 5 times that of other

the difference between the frequencies of the two signals is one fifth of hertz

the difference between the frequencies of the two signals is 5 Hz

either (a) or (c)

⇒ For most metals, Fermi level E

_{F}is less than

0.1 eV

2 eV

5 eV

10 eV

⇒ The frequency of the driving network connected between pins 1 and 2 of a 8085 chip must be

equal to the desired clock frequency

twice the desired clock frequency

four times the desired clock frequency

eight times the desired clock frequency