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Q1. | In a backward wave oscillator the wave travelling along the line winds itself back and forth |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ The output

*Y*of the circuit shown in the figur

(A + B) C + DE

AB + C(D + E)

(A + B) C + D + E

(AB + C) . DE

⇒ An unmodulated voltage 10

*V*effective is applied to a dioxide detector in which load resistance is 4 x 10

^{-5}ohms. A micrometer shows that the rectified DC current in this resistance is 30

*A*. The efficiency of detection is

0.34

0.555

0.688

0.847

⇒ The normal operation of JFET is

constant voltage region

constant current region

both constant voltage and constant current regions

either constant voltage or constant current region

⇒ Which one of the following is the correct sequence of the numbers represented in the series given below?

2, 3, 4, 5, 6......

2, 4, 6, 8, 10 .....

2, 4, 6, 10, 12......

2, 4, 6, 10, 16 .....

⇒ Which one of the following is a trivalent material?

Antimony

Phosphorus

Arsenic

Boron

⇒ In a vacuum triode μ =

*r*

_{p}

*g*

_{m}.

TRUE

FALSE

⇒ An average response rectifier type electronic voltameter has a d.c. voltage of 10 V applied to it. What is the meter reading?

7.1 V

10 V

11.1 V

22.2 V

⇒ The number of operator to accomplish basic arithmetic in Java is

4

5

6

7

⇒ In figure, secondary winding has 40 turns. For maximum power transformer to 2 ohm resistance the number of turns in primar

20

40

80

160

⇒ The sum of two sine waves of different frequencies is a sine wave.

TRUE

FALSE

⇒ An air-filled rectangular waveguide has dimensions 8

*cm*x 10

*cm*. The phase velocity of guided wave at frequency of 3 GH

*z*for TE

_{10}mode is

1.5 x 10

^{8}

*m/s*

5.5 x 10

^{8}

*m/s*

3.46 x 10

^{8}

*m/s*

0.18 x 10

^{7}

*m/s*

⇒ A discrete random variable X takes values from 1 to 5 with probabilities as shown in the table. A student calculates the mean of X and 3.5 and her teacher calculates the variance of X as 1.5. Which of the following statements is t

Both the student and the teacher are right

Both the student and the teacher are wrong

Both the student is wrong but the teacher is right

The student is right but the teacher is wrong

⇒ For 10 bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then the signal to quantization noise ratio will

increased by 6 dB

increased by 12 dB

decreased by 6 dB

decreased by 12 dB

⇒ If each stage has a gain of 10 dB and noise figure of 10 dB, then the overall noise figure of a two stage cascade amplifier will be

10

1.09

1

10.9

⇒ In a N-type semi-conductor, the concentration of minority carriers is mainly depends on

the number of acceptor atoms

the number of donor atoms

the extent of doping

the temperature of the material

⇒ The counter in the given figur

Mod 3

Mod 6

Mod 8

Mod 7

⇒ Feedback factor may be less or more than 1.

TRUE

FALSE

⇒ A pole zero pattern of a certain filter is shown in figure. This filter mus

LPF

BFP

HPF

APF

⇒ When a ferromagnetic substance is magnetised there are small changes in dimensions. This phenomenon is called

hysteresis

magnetostriction

diamagnetism

dipolar relaxation

⇒

**Assertion (A):** The speed of a shaft can be measured by using a dc tacho generator.

**Reason (R):** A two phase servometer can also be used as a speed transducer.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true R is false

A is false R is true

⇒ PIL tube means

Picture in Line Tube

Precision in Line Tube

Pairing in Line Tube

Pattern in Line Tube

⇒ In a Weston synchronoscope, the moving coil is connected across

bus bar

incoming alternator

lamp

fixed coils

⇒ Wien bridge uses

lead network

lag network

lead-lag network

Both (a) and (b)

⇒ A permanent magnet moving coil meter can be used as

ac only

dc only

both ac and dc

low frequency ac and dc

⇒ In the circuit shown the voltage V

_{s}has a phase angle of __________ with respect to V

_{L120°60 °-90 °0°}

⇒ The 2732 is 4096 x 8 EPROM. How many address lines does it have?

12

24

50

100

⇒ The collector voltage V

_{C}of the circuit shown in the given figure aside is approxima

2 V

4.6 V

8 V

8.6 V

⇒ The boundary conditions at the interface between two dielectrics in an electric field are given by

D

_{normal}= 0, E

_{tangential}= 0

D

_{normal}= 0, E

_{normal}= 0

D

_{tangential}= 0, E

_{tangential}= 0

D

_{tangential}= 0, E

_{normal}= 0

⇒ If operator '

*a*' = 1 ∠120° then (1 +

*a*

^{2}) =

3

3 ∠30°

3 ∠ - 30°

3 ∠60°

⇒ If X(

*z*) = (1 -

*a*)

*z*

^{-1}/[(1 -

*z*

^{-1})(1 -

*az*)] and 1 < |

^{-1}*z*|, the final value of

*x*

*is*

_{k}0

1

∞

2