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Q1. | Which of the following can be used to convert PPM into PWM? |

A. | Integrator [Wrong Answer] |

B. | Astable multivibrator [Wrong Answer] |

C. | Bistable multivibrator [Correct Answer] |

D. | Monostable multivibrator [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒ An audio signal of FM radio station is sampled at a rate of 15% above the Nyquist rate. Signal is sampled in 512 levels and bandwidth of the signal is 4 KHz. The minimum bandwidth required to transmit this signal will be

77 K bits/sec

92 K bits/sec

84.8 K bits/sec

82.8 K bits/sec

⇒ In a 50 cm TV tube, a path difference of 2 km between direct wave and interfering wave would mean a displacement between main image and ghost image equal to

0.3 cm

3 cm

6 cm

9 cm

⇒ Consider the following

- Maximum energy of electrons liberated photoelectrically is independent of light intensity
- Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.

(1) is true and (2) is false

(1) and (2) both are true

(1) is false and (2) is true

(1) and (2) both are false

⇒ A TV picture is to be transmitted over a channel of 6 MH

*z*bandwidth at a 35 dB S/N ratio. The capacity of the channel is

50 M

*bps*

100 M

*bps*

36 M

*bps*

72 M

*bps*

⇒ In a three variable K map four adjacent cells give

single variable term

two variable term

three variable term

either (a) or (b)

⇒

**Assertion (A):** JFET is a voltage controlled device.

**Reason (R):** The drain current can be controlled by controlling V_{GS}.

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

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

A is true but R is false

A is false but R is true

⇒ The properties of FETs closely resemble those of a

thermionic valve

P-N-P transistor

N-P-N transistor

UJT

⇒ Resistivity of semiconductors is around 100 Ω-m.

TRUE

FALSE

⇒

**Assertion (A):** A half cycle of sine wave can be expressed as sum of sine wave and another sine wave shifted by *T*/2 where T is the time period.

**Reason (R):** The function *u*(*t* - *t*_{0}) - *u*(*t* - *t*_{0} - T) is a gate function occuring at *t* = *t*_{0} and of duration T.

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 true, R is false

A is false, R is true

⇒ The system in the given figur

type 0 system

type 1 system

type 2 system

type 3 system

⇒ A 4 bit ripple counter is in 0000 state. The clock pulses are applied and then removed. The counter reads 0011. The number of clock pulses which have occurred are

3

3 or 19

3 or 19 or 35

none of the above

⇒ Figure shows a self bias circuit for FET amplifier, I

_{D}= 4 mA. Then I

_{S4 mA2 mA0.4 mA0.2 mA}

⇒ A dc network has 3 independent nodes and 4 loops. In total analysis, the number of equations is

4

3

2

1

⇒ The integral of

*k*δ(

*t*) is

a step function of magnitude

*k*

a step function 'of magnitude 1/

*k*

a ramp of slope

*k*

a ramp of slope 1/

*k*

⇒ A computer monitor uses 180 W in normal operation and 20 W in sleep mode. The computer is on all the 24 hours but is in sleep mode for 18 hours a days. The energy units saved in 30 days are

0.54 units

86.4 units

2.88 units

4.8 units

⇒ For the floating point numbers 1.81 x 10

^{-29}and 0.0152 x 10

^{18}the normalised forms are

0.181 x 10

^{-28}and 0.152 x 10

^{17 }respectively

18.1 x 10

^{-30}and 0.152 x 10

^{17}respectively

0.181 x 10

^{-28}and 1.52 x 10

^{16}respectively

None of the above

⇒ In the following non-planar graph no.of independent loop equations

8

12

7

5

⇒ A binary ladder network D/A converter requires

resistors of one value only

resistors of many different values

resistors of two different values

none of the above

⇒ Consider a 300 Ω, quarter wave long at 1 GHz transmission line as shown in figure. It is connected to a 10 V, 50 Ω source at one end is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line

10 V

5 V

60 V

60/7 volt

⇒ When .9432 E - 4 is subtracted from .5452 E - 3 in normalized floating point mode

none of the numbers is changed

.9432 E - 4 is changed to .09432 E - 3 and .5452 E - 3 is not changed

.5452 E - 3 is changed to 5.452 E - 4 but .9432 E - 4 is not changed

both Ihe numbers are changed and their exponents are, made equal to -5

⇒ The advantage of Weinbridge oscillator over the phase shift oscillator is that oscillator the frequency may be varied over a range of

0.0430555555555556

0.04375

0.0451388888888889

0.0486111111111111

⇒ For a sinusoidal input, the circuit shown in the figure will act

Pulse generator

Full wave rectifier

Ramp generator

Voltage Doubler

⇒ The effect of a finite gain of operational amplifier used in an integrator is that

it would not integrator

slope of the O/P will varied with time

final value of the O/P

there will be instability in the cirucuit

⇒ The inconsistency of Ampere's law can be removed by adding __________ to it.

displacement current density alone.

conduction current density alone.

displacement and conduction current densities.

none of these

⇒ In active filter circuits, inductances are avoided mainly because they

are always associated with some resistance

are bulky and unsuitable for miniaturisation

are non-linear in nature

saturate quickly

⇒ Two sinusoidal waves 1 and 2 have peak values V

_{m1}and V

_{m2}. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct?

*v*

_{1}= V

_{m1}sin θ and

*v*

_{2}= V

_{m2}cos θ

*v*

_{1}= V

_{m1}sin ω

*t*and

*v*

_{2}= V

_{m2}sin (ω

*t*- θ)

*v*

_{1}= V

_{m1}sin (ω

*t*+ θ/2) and

*v*

_{2}= V

_{m2}sin ω

*t*

none of the above

⇒ What is the propagation constant for air filled wave guide with dimensions

*a*= 1.59" and

*b*= 0.795" at 4.95 GHz?

0.6698

0.7698

0.503

0.6598

⇒ In figure, the capacitor is charged to 1 V. At

*t*= 0 the switch is closed so that

*i*=

*e*

^{-t}. When

*i*= 0.37 A, the voltage across capacito

1 V

0.63 V

0.37 V

0.185 V

⇒ An insulator will conduct when the

voltage applied is more than the breakdown voltage

temperature is raised to very high level

either (a) or (b) above

none of the above

⇒ Figure represen

Diode rectifier

Schottky diode

Varistor

None of the above