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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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**Also Read Similar Questions Below :**

⇒ For emitter-couple logic, the switching speed is very high because

negative logic is used

the transistors are not saturated when conducting

emitter-coupled transistors are used

multi-emitter transistors are used

⇒ In all pure metals, temperature coefficient of resistance is positive.

TRUE

FALSE

⇒ The resolution of an

*n*bit DAC with a maximum input of 5 V is 5 mV. The value of

*n*is

8

9

10

11

⇒ The realization of the term Ks yields

a resistance of value K ohms

a capacitances of value K farads

an inductance of value k farads

either (b) or (c)

⇒ Why does a FM radio station perform better than and AM station radiating the same actual power?

FM is immune to noise

AM has only two sidebands while FM has more

FM uses larger bandwidth for large modulation depth.

Capture effects appears in FM.

⇒ Elements R, L, C are connected in parallel and excited by a dc current I. If

*i*

_{R},

*i*

_{L}and

*i*

_{C}are the currents through R, L, C respectively then at

*t*= 0

*i*

_{R}>

*i*

_{L}>

*i*

_{C}

*i*

_{L}>

*i*

_{R}>

*i*

_{C}

*i*

_{C}= 0

*i*

_{C}= I

⇒ The output of the circuit shown below will be of the frequ

125 Hz

250 Hz

500 Hz

750 Hz

⇒ The distance at which a sky wave is received back on earth decreases with angle of incidence for all angles of incidence.

TRUE

FALSE

⇒ A plot of modulation index vs carrier amplitude yields a

horizontal line

vertical line

parabola

hyperbola

⇒ The amount of dielectric heating is inversely proportional to frequency.

TRUE

FALSE

⇒ The trigonometric Fourier series for the waveform

*f(t)*shown below con

only cosine terms and zero value for the dc component

only cosine terms and a positive value for the dc component

only cosine terms and a negative value for the dc component

only sine terms and a negative for the dc component

⇒ If the mantissa of a digital computer is 37 bit long then the accuracy of the digital computer will be of

37 decimal places

23 decimal places

11 decimal places

accuracy is independent of the length to mantissa

⇒ Electrical conductivity of metals expressed in ohm

^{-1}m

^{-1}is of the order of

10

^{10}

10

^{5}

10

^{-4}

10

^{-6}

⇒

Match the following:

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

A. | Wein bridge oscillator | 1. | Low output impedance |

B. | Voltage shunt feedback amplifier | 2. | RF frequency range |

C. | Crystal oscillator | 3. | Audio frequency range |

D. | Current shunt feedback amplifier | 4. | High input impedance |

5. | High output impedance |

A-3, B-1, C-2, D-5

A-3, B-5, C-1, D-2

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

A-5, B-1, C-2, D-1

⇒ In an electrochemical process the mass of material deposited at an electrode is proportional to

time for which current is passed

magnitude of current

electric charge through the electrolyte

none of the above

⇒ In a multicavity klystron amplifier the signal to be amplified develops an ac voltage of signal frequency across the gap in buncher cavity

TRUE

FALSE

⇒ Four voltmeters have following specifications. If accuracy is main consideration which is the best?

100 V, 2 mA

100 V, 100 mA

100 V, 1 mA

100 V, 0.1 mA

⇒ Thyristors can be used for control of

dc separately excited motor

dc shunt motor

dc series motor

all of the above

⇒ In a power amplifier the collector current flows for 270° of the input cycle. The operations is

class A

class B

class AB

class C

⇒ The effective length of antenna is different from actual length due to

top loading

end effects

both (a) and (b)

none of the above

⇒ The important postulate arising out of Maxwell's modification of Ampere's law is

a changing magnetic field produces an electric field

a changing electric field produces a magnetic field

a motional e.m.f. is produced by a coil moving in a magnetic field

a steady current produce a magnetic field

⇒ The unit for mmf is

A

Wb

T

V

⇒ The minimum gate source voltage that creates the

*n*-type inversion layer is called

cut off voltage

on voltage

threshold voltage

zener voltage

⇒ The region between a pin of parallel perfectly conducting planes of infinite extent is

*y*and

*z*directions is partially filled with a dielectric as shown be

-2

2

0

1

⇒ It is desired to evaluate the expression

`F = B * COS (Y) + C * SQR (COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

`F = B * COS (Y) + C * SQR [COS (Y)] + A * COS (Y) * SQR [COS (Y)]`

`F = B * COS (Y) + C * COS(Y) * COS (Y) + A * COS (Y) * COS (Y) * COS (Y)`

` X = COS(Y)`

⇒ In the following transistor circuit *V*_{BE} = 0. 7 V, *r*_{c} = 25mV/I_{E}, and β and the capacitance are very l

-180

-120

-90

-60

⇒ The correct sequence of parts in klystron amplifier are

anode, catcher cavity, cathode, buncher cavity

cathode, buncher cavity, catcher cavity, cavity

anode, buncher cavity, catcher cavity, cathode

cathode, catcher cavity, anode, buncher cavity

⇒ In order to achieve accuracy, the slide wire of a potentiometer should be

as long as possible

as short as possible

neither too long nor too short

very thin

⇒ Which rectifier has the best ratio of rectification?

Half wave rectifier

Full wave rectifier

Bridge rectifier

Three phase full wave rectifier

⇒ Which of the following is/are correct statement(s)? - Bus is a group of wires carrying information.
- Bus is needed to achieve reasonable speed of operation.
- Bus can carry data or address.
- A bus can be shared by more than one device.

Select the correct answer from the codes given below

1 only

1 and 2 only

2, 3 and 4 only

1, 2, 3 and 4

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