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Q1. | A magnetron requires an external magnetic field with flux lines parallel to axis of cathode |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ The conductivity of an intrinsic semiconductor is

generally less than that of a doped semiconductor

given by σ

_{1}=

*en*

_{i}(μ

_{n}- μ

_{p})

given by σ

_{1}=

*en*

_{i}(μ

_{p}+ μ

_{n})

given by σ

_{1}=

*n*

_{i}(μ

_{n}+ μ

_{p})

⇒ In a rectifier only a portion of input power is converted into DC power. The rest is AC power.

TRUE

FALSE

⇒ It is very likely in __________ gate family that when one gate is driving number of gates in __________ , a gate having least voltage for saturation may consume large __________ leaving other gates inoperative and this phenomenon is called __________ .

DTL, parallel, current, current - sinking

DCTL, parallel, current, current-lagging

ECL, series, voltage, voltage-deterioration

DCTL, series, current, current-lagging

⇒ Resistivity of semiconductors is around 100 Ω-m.

TRUE

FALSE

⇒ In a minimum function

the degree of numerator and denominator are equal

the degree of numerator and denominator are unequal

the degree of numerator is one more than degree of denominator

the degree of numerator is one less than degree of denominator

⇒ Identify which of the following is not a tree of the graph shown in fi

*bcgh*

*defg*

*abfg*

*aegh*

⇒ In TE

_{10 }mode the largest electric field in a rectangular wave guide, occurs

along centre line of broad wall (

*i*.

*e*.

*x*=

*a*/2)

along the broad wall (

*i*.

*e*.

*x*= 0 and

*x*=

*a*)

either (a) or (b)

neither (a) nor (b)

⇒ Shifting digits from left to right and vice versa is needed in

storing numbers

arithmetic operations

counting

storing and counting

⇒ Consider two random processes

*x(t)*and

*y(t)*have zero mean, and they are individually stationary. The random process is

*z(t)*=

*x(t)*+

*y(t)*. Now when stationary processes are uncorrelated then power spectral density of

*z(t)*is given by

S

*+ S*

_{x}(f)*+ 2S*

_{y}(f)

_{xy}(f)S

*+ S*

_{x}(f)*+ 2S*

_{y}(f)*+ 2S*

_{xy}(f)

_{yx}(f)S

*+ S*

_{x}(f)

_{y}(f)S

*+ S*

_{x}(f)*- 2S*

_{y}(f)*- 2S*

_{xy}(f)

_{yx}(f)⇒

Match the following:

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

A. | IF noise | 1. | Ganged tuning |

B. | Image frequency | 2. | Spurious response |

C. | Station selector | 3. | Leaky filter capacitor |

D. | Excessive Hum | 4. | Mixer stage |

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

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

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

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

⇒ Iron has a body centred cubic structure.

TRUE

FALSE

⇒ Two similar mutually coupled coils have a total inductance of 900 mH and coefficient of coupling 0.5. The self inductance of each coils is

300 mH

150 mH

75 mH

50 mH

⇒ In force voltage analogy the quantity analogous to spring constant K is

R

C

L

1/C

⇒ A full adder adds

2 bits

3 bits

4 bits

any number of bits

⇒ If A = 3 +

*j*1 and B = 4 +

*j*3, A - B =

8.062 ∠29.7°

10 ∠45°

2.236 ∠243.43°

6.72 ∠243.43°

⇒ Principle of superposition is applicable to

linear systems only

nonlinear systems only

both linear and non linear system

linear systems and some nonlinear systems

⇒ Bandwidth will be

*a*.

*b*

*a*+

*b*

*a*

*b*

⇒ In a CE amplifier the Q point is very close to cutoff point on the load line. This results in

saturation clipping

cut off clipping

both saturation and cut off clipping

either saturation clipping or cut off clipping

⇒ The power requirement of a RADAR used in military operations is

a few watts

about 500 W

about 2000 W

a few megawatts

⇒ The power required to produce a gain of 10 dB over 4 W of original power is __________ watt.

80

40

0.4

8

⇒ Wired AND connection can be used in TTL with totem pole output.

TRUE

FALSE

⇒ Heating effect of current is used in

ammeters

voltmeters

both ammeters and voltmeters

wattmeters

⇒ In 8 cavity magnetron the p mode corresponds to a total phase shift equal to

± 8 p radians around the periphery

± 4 p radians around the periphery

± 2 p radians around the periphery

± 16 p radians around the periphery

⇒ In control systems the output of sensor usually, is

analog electrical signal

digital electrical signal

mechanical signal

analog or digital electrical signal

⇒ The emitter follower is widely used in electronic instrument because

its voltage gain is less than unity

its voltage gain is very high

its O/P Impedance is low and input impedance is high

its O/P Impedance is high and I/P impedance is low

⇒ Each term in POS form is called max terms.

TRUE

FALSE

⇒

**Assertion (A):** A sweep circuit operates by virtue of recurring transient phenomenon.

**Reason (R):** Transients are always undesirable.

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 transistor with a = 0.9 and I

_{CBO}= 10 μA is biased so that I

_{BQ}= 90 μA. Then I

_{CQ}will be

910 mA

5 mA

5.25 mA

4.95 mA

⇒ The voltage applied to an R-L circuit at

*t*= 0 when switch is closed is 100 cos (100

*t*+ 30°). The circuit resistance is 80 Ω and inductance is 0.6 H (in which initial current is zero). What is the maximum amplitude of current flowing through the circuit?

0.0416666666666667

0.0833333333333333

0.208333333333333

0.416666666666667

⇒ In a TV studio the illuminance is about

200 lux

1000 lux

10000 lux

10 lux