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Q1. | An SCR has a turn on time of 4 μs. The gate pulse should have a duration of about |

A. | 2 μs [Wrong Answer] |

B. | 5 μs [Correct Answer] |

C. | 20 μs [Wrong Answer] |

D. | 50 μs [Wrong Answer] |

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Explanation:-
Answer : BDiscuss 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 :**

⇒ Which multivibrator can be used as a clock timer?

Astable multivibrator

Bistable multivibrator

Any of the above

None of the above

⇒ Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2

*a*x

*a*

critical wavelength for TE

_{10}mode is the same as that for TE

_{02}mode

critical wavelength for TE

_{10}mode is one half of that for TE

_{10}mode

critical wavelength for TE

_{10}mode is the same as that for TM

_{10}mode

critical wavelength for TE

_{10}mode is double that for TE

_{01}mode

⇒

**Assertion (A):** A class C amplifier is a timed amplifier which needs a tank circuit as the load in the collector circuit of the transistor for its proper operation

**Reason (R):** In class C operation collector current flows for less than 180° of the ac cycle and thus flows in pulses

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ (22)

_{4}+ (101)

_{3}- (20)

_{5}= (

*x*)

_{4}+ (4)

_{x+1}where

*x*> 4. The value of

*x*is

6

4

12

8

⇒ Consider the following statements about mutual inductances:

- The value should remain constant under all conditions.
- The mutual inductance should not vary with temperature.
- The inductance should be independent of excitation.
- They have two coils wound on a bobbin of hard magnetic material, coils being separated by a range.

2, 3, 4

1, 2, 3

1, 3, 4

1, 2, 4

⇒ In degenerate

*p*type semiconductor material, the Fermi level,

is in the valence band

is in conduction band

is at the centre in between valence and conduction bands

is very near conduction band

⇒ For the network shown below, if V

_{D}= 12 V and V

_{GSQ}= - 2 V value of R

_{S}wil

13.35 kΩ

3.35 kΩ

33.31 kΩ

3.95 kΩ

⇒ The baud rate is

always equal to the bit transfer rate

equal to twice the bandwidth of an ideal channel

not equal to the signalling rate

equal to one half the bandwidth of ideal channel

⇒ For TV broadcast, picture signal is modulated in

SSB

VSB

FM

AM

⇒ In 8085, which instructions are useful for writing and using subroutines?

CALL

RET

CALL and RET

none of the above

⇒ A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are

0101 and 5

0101 and 10

1010 and 5

1010 and 10

⇒ The units for electrochemical equivalent are

grams

grams per coulomb

gram-coulomb

grams per ampere

⇒ Which one of the following is D/A conversion technique?

Successive approximation

Weighted resistor

Dual slope

Single slope

⇒ Household tape recorders use

separate motor for each operation

only one motor for all operations

one motor for capstan and another for take up reel

a total of 3 motors

⇒ A cycloconverter cannot give a frequency higher than input frequency.

TRUE

FALSE

⇒ For a level input sequential circuit

output in a level only

output is in the pulse form

output may be a pulse or a level form

none of these

⇒

Match the following:

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

A. | Ring modulator | 1. | Clock recovery |

B. | VCO | 2. | Demodulation of FM |

C. | Foster Seeley discriminator | 3. | Frequency conversion |

D. | Mixer | 4. | Summing of two points |

5. | Generation of FM | ||

6. | Generation of DSB-SC |

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

A-6, B-5, C-2, D-3

A-6, B-1, C-3, D-2

A-5, B-6, C-1, D-3

⇒ Which of the following oscillator circuits uses three capacitors in the phase shifting network?

Hartley

Clapp

Colpitt's

Both (b) and (c)

⇒ In figure, the transmission parameters are A = C = 1, B = 2 and D = 3. Then Z

_{in12/13 Ω13/12 Ω3 Ω4 Ω}

⇒

Match the following:

List I (Transmission system) | List II (Mode) | ||
---|---|---|---|

A. | Rectangular waveguide | 1. | TE/TM |

B. | Circular waveguide | 2. | TEM |

C. | Coaxial line | 3. | Quasi TEM |

D. | Microstrip line |

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

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

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

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

⇒ In a single stage differential amplifier, the output offset voltage is basically dependent on the mismatch of

V

_{BE}, I

_{B}and β

V

_{BE}and I

_{B}

I

_{B}and β

V

_{BE}and β

⇒ For a distortionless line, the parameters are related as

R/G = L/C

R/L = 1

R/G = C/L

RG = LC

⇒ Troposphere is the upper part of the Earth's atmosphere which absorbs large quantities of Sun's radiations.

TRUE

FALSE

⇒ The pole-zero configuration of the given figure can be

lag compensator

lead compensator

lead-lag compensator

series compensator

⇒ In a pulsed RADAR, the transmitter is connected to the antenna

during pulse interval

during interval between pulses

all the time

only during a fraction of pulse interval

⇒ A series RC circuit has fixed R and C and variable

*f*. The current locus will lie in the first quadrant.

TRUE

FALSE

⇒ The factor η for a UJT is about

0.1

0.2

0.6

0.9

⇒ Solution of Laplace equations, which are continuous through the second derivative, are called

bessel functions

odd functions

harmonic functions

fundamental functions

⇒ The inverse Laplace transform of 1/(

*s*-

*a*)

^{2}is

*e*

^{at}*t*

*e*

^{at}*t*

^{2}

*e*

^{at}*e*/

^{at}*t*

⇒ In a series ac circuit a voltage of 20 V at 25 Hz causes a current of 0.20 A, while the same voltage at 75 Hz causes a current of 0.12 A. The circuit consists of

R and C in parallel

R and C in series

R and L in series

either (a) or (b)