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Q1. | A voltage doubler circuit uses |

A. | two diodes [Wrong Answer] |

B. | two capacitors [Wrong Answer] |

C. | two diodes and two capacitors [Correct Answer] |

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

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

⇒ A pulse function having magnitude E and duration from

*t*= 0 to

*t*=

*a*can be represented as

sum of two pulse functions

difference of two pulse functions

difference of two step functions each of magnitude E and one originating at

*t*= 0 and the other at

*t*=

*a*

none of the above

⇒ If the frequency is less than the damped frequency in a series- inverter

the distortion of output voltage waveform is low

the distortion of output voltage waveform is high

the distortion of output voltage may be high or low depending on the load impedance

none of the above

⇒ Schottky clamping is resorted to in TTL gates

to reduce propagation delay

to increase noise margin

to increase packing density

to increase fan out

⇒ For a system with transfer funct

2.828

5.2915

5.088

cannot be determined

⇒ In the circuit figure LED will be on when

*v*

_{1less than 6 Vmore than 6 Vless than 12 Vmore than 12 V}

⇒ Consider the following statements

- A total of about 1 million bytes can be directly accessed by 8086 microprocessor.
- The 8086 has thirteen 16 bit registers.
- The 8086 has eight flags.
- Compared to 8086, the 80286 provides a higher degree of memory protection.

1, 2, 3, 4 are correct

1, 3, 4 are correct

1, 2, 4 are correct

1, 2, 3 are correct

⇒ The knee voltages in silicon and germanium diodes respectively are

0.3 V and 0.7 V

0.7 V and 0.3 V

0.7 V each

0.3 V each

⇒ Which of the following arithmetic operations requires only one operand in FORTRAN 77?

Addition

Multiplication

Negative

Substraction

⇒ The analog signal given below is sampled at 1200 samples per second.

*m(t)*= 2 sin 120 p

*t*+ 3 sin 240 p

*t*+ 4 sin 360 p

*t*+ 5 sin 480 p

*t*+ 6 sin 600 p

*t*+ 7 sin 720 p

*t*. The folding (maximum) frequency is __________ .

300 H

*z*

360 H

*z*

600 H

*z*

480 H

*z*

⇒ Auto correlation function

is an even function of t

is an odd function of t

may be an even or odd function of t

is both an odd and even function of t

⇒ 84

_{16}- 2

*A*

_{16}is equal to

5

*A*

_{16}

4

*A*

_{16}

7

*A*

_{16}

15

*A*

_{16}

⇒ As compared to a

*p*-

*n*junction diode

a schottky diode has lower cut in voltage and lower reverse saturation current

a schottky diode has higher cut in voltage and higher reverse saturation current

a Schottky diode has lower cut in voltage and higher reverse saturation current

a schottky diode has higher cut in voltage and lower reverse saturation current

⇒ A microwave connector should have high SWR.

TRUE

FALSE

⇒ Which of the following flip flops cannot be converted to D flip flop?

JK

SR

Master slave

None of the above

⇒ For measuring a very high resistance we should use

Kelvin's double bridge

Wheatstone bridge

Meggar

Either (a) or (c)

⇒ The core of an atom consists of

nucleus

nucleus and all orbits

nucleus and inner orbits

none of the above

⇒ In a series operated thyristor configuration, each thyristor should support 100 V. However, the three thyristors only support voltage of 100 V, 90 V and 85 V respectively. Hence, the string efficiency in the case is :

0.9845

0.4584

0.9167

none of these

⇒

**Assertion (A):** In register indirect addressing mode of 8085, the address of operand is in the specified register.

**Reason (R):** An example of register indirect addressing mode is `MOV, A, M.`

.

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 correct R is wrong

A is wrong R is correct

⇒ In an integral controller

the output is proportional to input

the rate of change of output is proportional to input

the output is proportional to rate of change of input

none of the above

⇒ The expression H

_{Z}= C cos(B

*x*) cos(A

*y*)

*yz*is for

TE wave

TM waves

both TE and TM waves

some TE and some TM waves

⇒ The feedback control system shown in figure is stable for what values of K and

K < 0, T > - 1

K > 0, T > 0

K > 0, T > - 1

K < 0, T > 0

⇒

Match the following:

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

A. | PMMC | 1. | Square law type scale |

B. | Moving iron | 2. | Very good response |

C. | Thermo-couple | 3. | Linear scale |

D. | Electrostatic | 4. | Voltmeter |

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

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

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

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

⇒ For an ideal noise free transistor amplifier the noise factor is

zero

zero dB

1 dB

depends on other factors

⇒ The equation sin (

*z*) = 10 has

no real or complex solution

exactly two distinct complex solutions

a unique solution

an infinite number of complex solutions

⇒ For BJT, under saturation condition

I

_{C}= βI

_{B}

I

_{C}> bI

_{B}

I

_{C}is independent of all other parameters

I

_{C}< βI

_{B}

⇒ The circuit show

voltage series feedback amplifier

transconductance amplifier

transresistance amplifier with open circuit mutual resistance R

_{F}

transresistance amplifier with short circuit mutual resistance R

_{F}

⇒ Which of these are universal gates?

Only NOR

Only NAND

Both NOR and NAND

NOR, NAND, OR

⇒ Zoning is used with a dielectric antenna in order to

permit pin-point focusing

reduce the bulk of the lens

increase the bandwidth of the lens

correct the curvature of the wavefront from a horn that is too short

⇒ A binary adder has

one half adder

one half adder and 2 full adders

two half adders

one half adder and many full adders

⇒ If it is desired to have low output impedance in an amplifier circuit then we should use

common collector circuit

common base circuit

common emitter circuit

either (b) or (c)