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Q1. | A 555 timer can be used as |

A. | an astable multivibrator [Wrong Answer] |

B. | monostable multivibrator [Wrong Answer] |

C. | frequency Divider only [Wrong Answer] |

D. | any of the above [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Generally, the gain of a transistor amplifier falls at high frequency due to the

internal capacitance of the device

coupling capacitor at the I/P

skin effect

coupling capacitor at the O/P

⇒ In CC configuration, the output signals has approximately

the same amplitude and phase

opposite amplitude and phase

same amplitude but opposite phase

none of the above

⇒ Bit is a unit of

entropy

information

channel capacity

rate of information

⇒ A number of impulses spaced fron one another form an impulse train.

TRUE

FALSE

⇒ If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is

0.6 Ω

5 Ω

6 Ω

10 Ω

⇒

Match the following:

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

A. | V_{OH}(min) | 1. | 2.4 V |

B. | V_{IH}(min) | 2. | 1.5 V |

C. | V_{OL}(max) | 3. | 0.4 V |

4. | 2.0 V | ||

5. | 0.8 V |

A-1, B-3, C-4

A-1, B-4, C-3

A-5, B-4, C-3

A-1, B-5, C-2

⇒

Match the following:

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

A. | LED | 1. | Heavy Doping |

B. | Avalanche Photodiode | 2. | Coherent Radiation |

C. | Tunnel diode | 3. | Spontaneous Emission |

D. | LASER | 4. | Current gain |

A-2, B-4, C-3

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

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

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

⇒ Which statement is correct?

BJT and MOSFET are current controlled devices

BJT is voltage controlled and MOSFET is current controlled device

BJT and MOSFET are voltage controlled devices

BJT is current controlled and MOSFET is voltage controlled device

⇒ A constant

*k*high pass filter has

*f*

_{c}= 3000 Hz. At

*f*= 1000 Hz, the phase shift is

zero

p

2 p

more than p

⇒ Magnesium is alloyed with conducting materials for antenna primarily with the purpose of

increasing efficiency

improving radiative power

reducing weight

increasing density

⇒ In a thermocouple two metal junctions between metals

*M*

_{1}and

*M*

_{2}are kept at temperature

*T*

_{1}and

*T*

_{2}. The thermocouple emf is produced because

M

_{1}, M

_{2}are similar and T

_{1}, T

_{2}are equal

M

_{1}, M

_{2}are similar but T

_{1}, T

_{2}are unequal

M

_{1}, M

_{2}are dissimilar but T

_{1}, T

_{2}are equal

M

_{1}, M

_{2}are dissimilar but T

_{1}, T

_{2}are unequal

⇒ In auxiliary commutated chopper, the charging and discharging time of capacitor

are constant

depend on load current

may be constant or may depend on load current

none of the above

⇒ The resonance frequency is

ω

_{r}=

*a*

ω

_{r}=

*b*

ω

_{r}=

*k*

ω

_{r}=

*ba*

⇒ When there is rapid attenuation of field inside the conductor, the field current are concentrated close to the surface of the conductor; this phenomenon is called

skin effect

EM concentration effect

Faraday's effect

Ohm's effect

⇒ An 8 level encoding scheme is used in a PCM system of 10

*k*H

*z*channel BW. The channel capacity is

80

*kbps*

60

*kbps*

30

*kbps*

18

*kbps*

⇒ Present day HVDC converters are all

3 pulse converters

6 pulse converters

12 pulse converters

either 6 pulse or 12 converters

⇒ If F

_{n}represents Fourier series coefficient of

*f*(

*t*), then Fourier series coefficient of f(

*t*+

*t*) =

F

_{n}

*e*

^{-jω}

_{0}

^{t}

F

_{n}

*e*

^{jω}

_{0}

^{t}

F

_{n}

*e*

^{jnω}

_{0}

^{t}

F

_{n}

*e*

^{-jnω}

_{0}

^{t}

⇒ An ideal voltage amplifier should have

low input impedance and high output impedance

high input impedance and low output impedance

high input impedance and high output impedance

low input impedance and low output impedance

⇒ 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

⇒ As per Matthiessen's rule, the total resistivity r of a conductor can be written as r = r

_{i}+

*a*T, where r

_{i}and

*a*are constants and T is absolute temperature. At very low temperatures

*a*T = 0

*a*T > r

_{i}

*a*T ∼ r

_{i}

*a*T < r

_{i}

⇒ The width of a radio beam from a 1 m diameter parabolic antenna at 10 GHz is about

100°

50°

5°

1°

⇒ The response to sinusoidal excitation can be found by

setting

*s*=

*j*ω in the network function

setting

*s*=

*-j*ω in the network function

taking inverse transform of network function

none of the above

⇒ The function Y = AC + BD + EF is

POS

SOP

Hybrid

none of the above

⇒ Symmetrical square wave of time period 100 μs can be obtained from square wave of time period 10 μs by using

divide by 5 circuit

divide by 2 circuit

divide by 5 circuit followed by divide by 2 circuit

BCD counter

⇒ If RADIUS = 3.0 the result of the following FORTRAN 77 program will be

1

28.2744

18

⇒ In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

purely real

purely imaginary

equal to unit

a complex number

⇒ Magnitude Plot of a Composite signal

*x*(

*t*) =

*e*

^{2jt}+

*e*

^{3jt}is

half wave rectified sinusoidal

full wave rectified sinusoidal

exponentially increasing sinusoidal

exponentially decreasing sinusoidal

⇒ Which of the following

*h*parameters is an admittance?

*h*

_{ie}

*h*

_{re}

*h*

_{fe}

*h*

_{oe}

⇒ Consider the following

- The first letter of a Java variable is lower case.
- Each successive word in Java variable begins with a capital letter.
- All other letters are lower case.
- A Java variable can have a digit as first character.

All

1, 2, 3 only

1, 2, 4 only

2, 3, 4 only

⇒ A junction FET, can be used as a voltage variable resistor

at pinch-off condition

beyond pinch-off voltage

well below pinch-off condition

for any value of V

_{DS}