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Q1. | In a voltage regulator circuit using zener diode the load voltage is nearly constant only if |

A. | zener current is very small [Correct Answer] |

B. | zener current is very large [Wrong Answer] |

C. | zener current is neither small nor large [Wrong Answer] |

D. | None of the above [Wrong Answer] |

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

⇒ Let

*f*

_{1}(

*t*) = G

_{1}(

*t*) + 4,

*f*

_{2}(

*t*) = G

_{2}(

*t*) + 3. If G

_{1}(

*t*) and G

_{2}(

*t*) are uncorrected then the correlation between

*f*

_{1}(

*t*) and

*f*

_{2}(

*t*) are

12

7

6

zero

⇒ Identical telephone numbers in different parts of a country are distinguished by their

area codes

office codes

access digits

language codes

⇒ A doped semi-conductor is called

impure semi-conductor

dipole semi-conductor

bipolar semi-conductor

extrinsic semi-conductor

⇒ State variables which describe a system are a unique set.

TRUE

FALSE

⇒ In a two phasor servomotor, the direction of rotation of the rotating field depends on

magnitudes of voltages applied to the two stator windings

phase relation of voltages applied to the two stator windings

both magnitude and phase relationship of voltages applied to the two stator windings

none of the above

⇒ If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of

3

9

27

81

⇒ Depending on the technique used, digitized television requires a bit rate between __________ millions.

40 and 92.5

25 and 60

30 and 82.5

2

⇒ Consider the following sys

System I has larger bandwidth and faster speed of response than System II

System II has larger bandwidth and faster speed of response than System I

System I has larger bandwidth but System II has faster speed of response

System II has larger bandwidth but System I has faster speed of response

⇒ Octal 16 is equal to decimal

13

14

15

16

⇒ In a Hurwitz polynomial

all coefficients are non-negative

the coefficients may be positive or negative

all coefficients are negative

all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis

⇒ Which one of the following gain equations is correct for a MOSFET common-source amplif

A

_{V}=

*g*

_{m}/(1 - R

_{D})

A

_{V}=

*g*

_{m}/R

_{D}

A

_{V}=

*g*

_{m}/(1 + R

_{D})

A

_{V}= R

_{D}/

*g*

_{m}

⇒ If V = 4 in the figure, the value of I

_{S}is given

0.25

5/2 A

0

None of these

⇒ For the signal flow graph of the given figure consider the following statements

- It has three forward paths
- It has three individual loops
- It has two non touching loops

1, 2, 3

1, 2

2, 3

1, 3

⇒ The minimum energy of a photon required for intrinsic excitation is equal to

energy of bottom of conduction band

energy of top of valence band

forbidden gap energy

Fermi energy

⇒ In a 3 input NAND gate, the number of states in which output is 1 equals

8

1

6

5

⇒

Match the following:

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

A. | Coastals receiver | 1. | VSB |

B. | Stereo-multiplexing | 2. | Demodulating DSB-SC |

C. | TV broad casting | 3. | FM radio broad casting |

4. | Slope overload | ||

5. | Matched filter |

A-1, B-3, C-2

A-2, B-3, C-1

A-2, B-1, C-4

A-4, B-3, C-1

⇒ 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*

⇒ The load circuit of a single phase full bridge inverter

must be underdamped

must be overdamped

may be underdamped or overdamped

may be any type of load

⇒ The sum of 1110101

_{2}and 11011

_{2}in decimal form will be

65

75

85

95

⇒ An RLC series circuit is underdamped. To make it overdamped, the value of R

has to be increased

has to be decreased

has to be increased to infinity

has to be reduced to zero

⇒ Which of the following devices has the 'negative resistance' characteristic?

Reflex klystron

Gunn diode

P-N-P transistor

Magnetron

⇒ In which configuration does output ac voltage appear between emitter and ground?

CE

CB

CC

Both CE and CB

⇒ A crystal is frequently used in digital circuits for timing purpose because of its

low cost

high frequency stability

simple circuitry

ability to set frequency at desired value

⇒ For a random variable

*x*following the probability density function, p(

*x*), shown in figure, the mean and the variance are respective

1/2 and 2/3

1 and 4/3

1 and 2/3

2 and 4/3

⇒ In figure readings of the two voltmeters shoul

100 V on each meter

200 V on each meter

150 V on V

_{1}and 50 V on V

_{2}

50 V on V

_{1}and 150 V on V

_{2}

⇒ In a superheterodyne radio receiver

RF amplifier normally operates at 455 kHz above carrier frequency

mixer input must be tuned to the signal frequency

local oscillator operates below signal frequency

local oscillator frequency is double the IF

⇒

Match the following:

List I (Octal) | List II (Decimal number) | ||
---|---|---|---|

A. | 35 | 1. | 53 |

B. | 65 | 2. | 62 |

C. | 54 | 3. | 29 |

D. | 76 | 4. | 44 |

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

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

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

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

⇒ For the same length of arrays, half power beam-width of binomial array

is equal to that of uniform arrays

is less than that of uniform array

is more than that of uniform array

is negligible as compared to that of uniform array

⇒ Pick the odd-one out

Hartley Oscillator

Colpitt oscillator

Clapp oscillator

Weinbridge oscillator

⇒ For type 0 system the starting point (

*i.e.*ω = 0) of polar plot is finite and is on positive real axis.

TRUE

FALSE