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Q1. | A typical value of g_{m} for a FET is about 25 μs. |

A. | TRUE [Wrong Answer] |

B. | FALSE [Correct Answer] |

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

⇒ Which of the following is correct (FDM means Frequency Division Multiplexing and TDM means Time Division Multiplexing)?

FDM requires lower bandwidth but TDM has more noise immunity

FDM has more noise immunity and requires lower bandwidth than TDM

FDM requires channel synchronization while TDM has more noise immunity

FDM requires more multiplexing while TDM requires band pass filter

⇒ A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

500

5

0.014

0.002

⇒ In the network of figure, the voltage drops across R

_{1}, R

_{2}, R

_{3}are 6 V, 8 V and 12 V with polarities as shown. The value of R

_{312 Ω8 Ω5 Ω3 Ω}

⇒ To ensure that only dominant TE

_{10}mode propagates in a rectangular waveguide, the operating frequency

must be more than cutoff frequency of

*TE*

_{10}mode

must be less than cutoff frequency of

*TE*

_{20}mode

must be more than cutoff frequency of

*TE*

_{10}mode and less than cutoff frequency of TE

_{20}mode

must be less than cutoff frequency of

*TE*

_{10}mode

⇒ Which of the following is not a travelling wave?

*e*= E

*sin (β*

_{m}*x*- ω

*t*)

*e*= E

*cos (β*

_{m}*x*- ω

*t*)

*e*= E

*sin (ω*

_{m}*t*- β

*x*)

*e*= E

*sin (β*

_{m}*x*)

⇒ Top loading in an antenna increases

effective height

beam width

input capacitance

bandwidth

⇒ In figure

*v*

_{1}= 8 V and

*v*

_{2}= 4 V. Which diode will cond

D

_{2}only

D

_{1}only

Both D

_{1}and D

_{2}

Neither D

_{1}nor D

_{2}

⇒ From the noise point of view, bandwidth should

be large

not be too large

should be as large as possible

should be infinite

⇒

**Assertion (A):** The velocity of electromagnetic waves on overhead lines and coaxial cables is the same.

**Reason (R):** Free space has an intrinsic impedance of 377 ohms.

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 but R is wrong

A is wrong but R is correct

⇒ In fi

Wave A is lagging wave B by ∠θ

Wave A is leading wave B by ∠θ

Wave A is lagging wave B by ∠θ and the two waves have same rms values

Wave A is lagging wave B by ∠θ and the two waves have different rms values

⇒

Match the following:

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

A. | Digital counter | 1. | Measurement of harmonics |

B. | Schering Bridge | 2. | Measurement of frequency |

C. | Meggar | 3. | Measurement of loss angle of dielectric |

D. | Spectrum analyser | 4. | Measurement of insulation resistance |

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

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

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

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

⇒ Two phasors having rms values V

_{1}and V

_{2}which are added to give a phasor having rms value V

_{3}. V

_{3}is maximum if phase angle between V

_{1}and V

_{2}is

90°

180°

270°

360°

⇒ A colour monitor usign 16 bits at a resolution of 600 x 400 pixels needs a memory of

240000 B

9600 B

6400 B

480000 B

⇒ Two coils having self inductances of 10 mH and 40 mH are mutually coupled. The maximum possible mutual inductance is

40 mH

20 mH

10 mH

5 mH

⇒ Which of the following is used in the sterilization of water?

Hydrogen bromide

Oxygen

Ozone

Caustic potash

⇒ In terms of ABCD parameters, the image parameter Z

_{11}is equal to

AC/BD

BD/AC

AB/CD

AD/BC

⇒ The initial state of MOD-16 down counter is 0110. What state will it be after 37 clock pulses?

Indeterminate

110

101

1

⇒ An encoder converts decimal numbers to binary and other codes.

TRUE

FALSE

⇒ The conductivity of materials found in nature ranges from 10

^{9}ohm

^{-1}m

^{-1}to nearly 10

^{18}ohm

^{-1}m

^{-1}from this it can be concluded that the conductivity of silicon in ohm

^{-1}cm

^{-1}will be nearly

0.5 x 10

^{-15}

0.5 x 10

^{-21}

0.5 x 10

^{-12}

0.5 x 10

^{-3}

⇒ Ridge waveguide is essentially a form of capacitively loaded guide.

TRUE

FALSE

⇒ The directive gain of λ/2 resonant wire is 1.64.

TRUE

FALSE

⇒ The poles of an RC function

are simple and lie or negative real axis

are simple and lie on ω axis

must be complex conjugate

may be anywhere on

*s*plane

⇒ In figure, the switch S is initially open and steady state conditions are reached. At

*t*= 0 switch is closed. The initial current through 2C capacito

zero

0.0416666666666667

0.0833333333333333

0.125

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

figure A

figure B

figure C

none

⇒ In single phase half wave regulator, the average current over one full cycle

is always positive

may be positive or negative

may be negative

is always negative

⇒ The number of channels available in MF band (300 kHz - 3 MHz) for AM modulating signal of 20 kHz is

70

67

100

150

⇒ Out of S, R, J, K, Preset, Clear inputs to flip flops, the synchronous inputs are

S, R, J, K only

S, R, Preset, Clear only

Preset, Clear only

S, R only

⇒ In metals the thermal conductivity

*K*and electrical conductivity σ are related as (K/σT) = L, L is known as

Lattice constant

Lorentz number

Lanevin function

Larmor number

⇒ A plot of modulation index vs carrier amplitude yields a

horizontal line

vertical line

parabola

hyperbola

⇒ A sine wave with slew rate distortion looks like

step wave

square wave

triangular wave

cosine wave