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Q1. | Ultra high frequency oscillators work in the range |

A. | 20 Hz to 20 kHz [Wrong Answer] |

B. | 1 kHz to 30 kHz [Wrong Answer] |

C. | 30 kHz to 30 MHz [Wrong Answer] |

D. | above 30 MHz [Correct Answer] |

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

⇒ Two coils are connected in parallel. Their fluxes are adding. If the connections of one of the coils are reversed, the total inductance of the arrangement

will decrease

may increase or decrease

will remain the same

will increase

⇒ In a TV receiver antenna the length of reflector rod

is the same as that of dipole

is less than that of dipole

is more than that of dipole

may be equal, more or less than that of dipole

⇒ V

_{R}at

*t*< T,

*t*= &in

500

*e*

^{-40x104t}, 0

100

*e*

^{-40x103t}, 0

100

*e*

^{-40x106t}, 0

100

*e*

^{-40x104t}, 0

⇒ The electric field on the surface of a perfect conductor is 2V/m. The conductor is immersed in water with ε = 80 ε

_{0}. The surface charge density on the conductor is ((ε

_{0}= 10

^{-9}/36p)F/m)

0 c/m

^{2}

2 c/m

^{2}

1.8 x 10

^{-11}c/m

^{2}

1.14 x 10

^{-9}c/m

^{2}

⇒ For a series circuit of R and variable X

_{L}the admittance locus is

a semicircle in first quadrant

a semicircle in fourth quadrant

a straight line in first quadrant

a straight line in fourth quadrant

⇒ In a coaxial line

the characteristic impedance is less than that of two wire line

the wave velocity is less than that of two wire line

both (a) and (b)

neither (a) nor (b)

⇒ In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about

0.1

1.25

5

10

⇒ Which of the following devices uses a helix?

Klystron amplifier

Klystron oscillator

TWT

Both (a) and (b)

⇒ In an RC series circuit R = 100 Ω and X

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the current and voltage are in phase

the current leads the voltage by about 6°

the current leads the voltage by about 84°

the current lags the voltage by about 6°

⇒ A photoconductor is a

conductor

semiconductor

insulator

superconductor

⇒ Read the following statements as regards register pairs in microprocessor 8085

- B represents B, C pair with B as high order register and C as low order register.
- D represents D, E pair with D as high order register and E as low order register.
- H represents H, L pair with H as high order register and L as low order register.

All

1 and 3

1 and 2

2 and 3 only

⇒ The transfer function V

_{2}/V

_{1}for figure

a zero at origin

a zero at infinity

no zero

a zero at

*j*1

⇒

**Assertion (A):** C has 32 keywords like auto, if, do, float etc.

**Reason (R):** Key words can not be used as variable names in C.

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 correct R is wrong

A is wrong R is correct

⇒ An antenna is synonymous to a

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transformer

regulator

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⇒ In a 3 input NOR gate, the number of states in which output is 1 equals

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2

3

4

⇒ Given I

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_{s}= 20 V, the current I in the 3 Ω resistance is give

0.166666666666667

0.333333333333333

0.0833333333333333

16 A

⇒ In a 4 bit D/A converter, the offset error is the output voltage when input digital voltage is

1111

0

either 1111 or 0000

none of the above

⇒ Unit step is a

energy signal

power signal

neither energy nor power signal

none

⇒ If

*f*(

*t*) = -

*f*(-

*t*) satisfies Drichlet conditions, then

*f*(

*t*) can be expanded in Fourier series containing

only sine terms

only cosine terms

cosine terms and constant

sine terms and constant

⇒ In a bipolar transistor which current is smallest

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base current

emitter current

any of the three currents

⇒ The circuit in the given figur

low pass filter

high pass filter

band Pass filter

band reject filter

⇒ Which of the following microphones is used as a standard for calibration?

Moving coil

Carbon

Condenser

Ribbon

⇒ For the Infix expression A + B - C + D the Postfix notation is

AB + C - D +

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AB - C + D

None of the above

⇒ In the circuit, V

_{s}= 10 cos ω

*t*, power drawn by the 4Ω resistor is 8 watt. The power facto

1

0.5

0.85

0

⇒ The skip distance is

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independent of frequency

independent of the state of ionisation

independent of transmitted power

⇒ What is the purpose of peak clipper circuits in radio transmitters?

To prevent overmodulation

To reduce bandwidth

To increase bandwidth

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⇒ Which of the- following display consumes least amount of power?

LCD

LED

Fluorescent display

All display consume same power

⇒ 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

⇒ A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

decrease to finite non-zero value

remain the same

increase

decrease to zero

⇒ To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required

5

3

10

2