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Q1. | An antenna is synonymous to a |

A. | generator [Wrong Answer] |

B. | transformer [Correct Answer] |

C. | regulator [Wrong Answer] |

D. | reflector [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 :**

⇒ Which of the following can provide a digital signal?

Slow change in the value of a resister

Sine wave

Square wave

Gradual turning of a potentiometer

⇒ The divergence of the electric field intensity at any point equals

1/4 pε

_{0}times the volume charge density

l/ε

_{0}times the volume charge density at that point

ε

_{0}times the volume charge density at that point

the volume charge density at that point

⇒

Match the following:

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

A. | Mu Metal | 1. | very high magnetic permeability |

B. | Samrium/cobalt | 2. | very high magnetic remanence |

C. | Sapphire | 3. | very high thermal conductivity |

D. | Ferrites | 4. | very stable magnetic permeability |

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

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

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

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

⇒ A thyristor has its gate current zero. To start conduction the forward voltage must exceed

about 0.5 V

forward breakover voltage

on state voltage

peak working off state forward voltage

⇒ Inputs A and B of the given figure are applied to a NAND gate. The output is

from 0 to 6

from 0 to 2

from 0 to 1 and 2 to 3

from 1 to 2 and 3 to 4

⇒ Consider the following statements, SWR of a transmission line is infinite when the load is

- a short circuit
- a complex impedance
- an open circuit
- a pure reactance

1 and 3 only

1, 2, 3

2, 3, 4

1, 2, 4

⇒ The power requirements of a DRAM in active and stand by modes is about

350 mW and 5 mW respectively

350 mW each

5 mW each

350 mW and 100 mW respectively

⇒ An op-amp has

low input and output impedance

low input impedance and high output impedance

low output impedance and high input impedance

high output impedance and high input impedance

⇒ Which of the following statement about modulation is correct?

It avoid use of antennas

It reduces bandwidth

It ensures transmission over long distances

It combines different transmissions

⇒

**Assertion (A):** A demultiplexer cannot be used as a decoder

**Reason (R):** A multiplexer selects one of many outputs whereas a decoder selects on output corresponding to coded input.

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

⇒ A series R-C circuit with R = 3 Ω and X

_{C}= 4 Ω at 50 Hz is supplied with a voltage V = 50 + 141.4 sin 314

*t*. What is the RMS value of the current flowing through the circuit?

0.208333333333333

0.416666666666667

20 A

22-36 A

⇒ T.V. antennas are usually

Yagi-Uda

loops

helical

parabolic

⇒ An 8156 has A

_{15}connected to its CE input. A

_{14}to A

_{8}are unconnected, and AD

_{7}to AC

_{0}are connected ignoring shadows, what are the RAM locations?

(4000)

_{H}- (40FF)

_{H}

(8000)

_{H}- (80FF)

_{H}

(8000)

_{H}- (40FF)

_{H}

Any of the above

⇒ In a metal the probability of a state 0.1 eV below Fermi level being occupied

is more than the probability of state 0.1 eV above Fermi level being occupied

is the same as the probability of state 0.1 eV above Fermi level being occupied

is less than the probability of state 0.1 eV above Fermi level being occupied

may be equal to or more or less than the probability of state 0.1 eV above Fermi level being occupied

⇒ In a 3 phase semiconverter, the firing frequency is

equal to line frequency

3 times the line frequency

6 times the line frequency

12 times the line frequency

⇒ In figure, the short circuit current through terminal AB wil

1.5 A

0.125

0.0833333333333333

0.0416666666666667

⇒ A-P type material has an acceptor ion concentration of 1 x 10

^{16}per cm

^{3}. Its intrinsic carrier concentration is 1.48 x 10

^{10}/ cm. The hole and electron mobilities are 0.05m

^{2}/V-sec and 0.13 m

^{2}/V-sec respectively calculate the resistivity of the material

12.5 Ω-cm

1.25 Ω-cm

0.125 Ω-cm

125 Ω-cm

⇒ If

*e*= 10 sin(10

^{8}

*t*+ 3 sin 10

^{4}

*t*) then the deviation is

4.77 kHz

47.7 kHz

477 kHz

4770 kHz

⇒ In 8085 the data is stored in the stack on

First in First Out basis

Last in First Out basis

First in Last Out basis

Last in Last Out basis

⇒ The range of visible light is

300 to 2000 Å

200 - 4000 Å

4000 to 7700 Å

more than 10000 Å

⇒

*i*

_{1}(

*t*) for

*t*> 0 is give

2.5 - 2.5

*e*

^{-2t}

2.5 - 1.25

*e*

^{-2t}

1.25 - 1.25

*e*

^{-2t}

None of these

⇒ In shot noise

the current rises around mean value

the current rises to peak value, decreases to zero and then again rises

the current may become negative

the current is always less than the mean value

⇒ For addition and subtraction operations, phasors

must be represented in polar form

must be represented in rectangular form

may be represented in any form

none of the above

⇒ How can the bandwidth of a control system be increased?

By the use of phase lead network

By the use of phase lag network

By the use of both phase-lag and phase-lead network

By the use of cascaded amplifiers in the system

⇒ Find V

_{x}V

_{y}V

_{zVx = -6 Vy = 3 Vz = -3Vx = -6 Vy = -3 Vz = 1Vx = 6 Vy = 3 Vz = 3Vx = 6 Vy = 1 Vz = 3}

⇒ The rate at which information can be carried through a communication channel depends on

carrier frequency

bandwidth

transmission loss

transmitted power

⇒ The circuit in figure is switched on at

*t*= 0. At any time

*t*,

*i*(

*t3 + 3*

6 - 3

3 - 3

6 - 6

*e*^{-1}6 - 3

*e*^{-1}3 - 3

*e*^{-t}6 - 6

*e*^{-1}

⇒ A signum function is

zero for

zero for

unity for

2∪(

⇒ An RLC series circuit has a variable inductance. The value of L for resonance conditions at fundamental frequency is 0.18 H. For resonance conditions at third harmonic frequency the value of inductance is

0.54 H

0.06 H

0.02 H

1.62 H

⇒ A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

decrease the firing angle

increase the firing angle

either decrease or increase the firing angle depending on the required speed

decrease the load torque

⇒ A signum function is

zero for

*t*greater than zerozero for

*t*less than zerounity for

*t*greater than zero2∪(

*t*) - 1⇒ An RLC series circuit has a variable inductance. The value of L for resonance conditions at fundamental frequency is 0.18 H. For resonance conditions at third harmonic frequency the value of inductance is

0.54 H

0.06 H

0.02 H

1.62 H

⇒ A dc series motor is coupled to a load whose torque is proportional to speed. It is fed by a single phase ac supply through a full converter. When speed is 500 rpm, firing angle is 45°. It is desired to raise the speed. It will be necessary to

decrease the firing angle

increase the firing angle

either decrease or increase the firing angle depending on the required speed

decrease the load torque