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Q1. | Which one is a linear system? |

A. | y[n] = x[n] x x[n - 1] [Wrong Answer] |

B. | y[n] = x[n] + x[n - 10] [Correct Answer] |

C. | y[n] = x^{2}[n] [Wrong Answer] |

D. | (a) and (c) [Wrong Answer] |

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

⇒ In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is

0 ≤ a ≤ p

θ ≤ a ≤ p

0 ≤ a ≤ (p - θ)

θ ≤ a ≤ (p + θ)

⇒ A series RLC circuit is at resonance at 200 Hz. If capacitance is increased to four times, the circuit will be in resonance at

200 Hz

400 Hz

100 Hz

800 Hz

⇒ The active elements on the positive and negative plates of lead acid battery are:

lead peroxide and lead

lead and lead peroxide

lead peroxide and lead sulphate

lead and lead

⇒ The input and output of a continuous time system are respectively denoted by

*x*(

*t*) and

*y*(

*t*) Which of the following descriptions corresponds to a causal system?

*y(t)*=

*x*(

*t*- 2) +

*x*(

*t*+ 4)

*y*(

*t*) =

*x*(

*t*- 4) +

*x*(

*t*+ 1)

*y*(

*t*) =

*x*(

*t*+ 4) +

*x*(

*t*- 1)

*y*(

*t*) =

*x*(

*t*+ 5) +

*x*(

*t*+ 5)

⇒ A power supply has full-load voltage of 20 V. What will be its no load voltage when its voltage regulation is 100%

0 V

10 V

20 V

40 V

⇒

Match the following:

List I (F.T and F.S) | List II (Properties) | ||
---|---|---|---|

A. | Fourier Series | 1. | Discrete, Periodic |

B. | Fourier Transform | 2. | Continuous, Periodic |

C. | Discrete Time Fourier | 3. | Discrete aperiodic |

D. | Discrete Fourier Transform | 4. | Continuous, aperiodic |

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

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

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

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

⇒ Which memory is available in all technologies?

PROM

EEPROM

ROM

EPROM

⇒

**Assertion (A):** Hall effect is observed in all metals but is very appreciable in semiconductors.

**Reason (R):** Hall effect transducer is very suitable for measurement of magnetic flux density.

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

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

A is true R is false

A is false R is true

⇒ The term critical frequency denotes

the lowest frequency that is reflected by the ionosphere

the highest frequency that is reflected by the ionosphere at vertical distance

the lowest frequency by which communication is possible between two given points

none of the above

⇒ In the circuit, the value of the voltage source

-22 V

-12 V

+12 V

-10 V

⇒ The mean life time of the minority carriers is in the range of a few

seconds

milli seconds

micro seconds

nano seconds

⇒ Which of the following devices has substrate?

JFET

Depletion Type MOSFET

Enhancement type MOSFET

Both (b) and (c)

⇒ The integral of a unit step function is

an impulse function

a ramp function

a ramp function of slope 1

none of these

⇒ In a varactor diode the increase in width of depletion layer results in

decrease in capacitance

increase in capacitance

no change in capacitance

either (a) or (b)

⇒ Distances near the skip distance should be used for sky-wave propagation

to avoid the Faraday effect

to avoid tilting

to prevent sky-wave and upper ray interference

so as to exceed the critical frequency

⇒ T.V. broadcasting based on

line of sight communication

ionospheric propagation

ground wave

medium wave

⇒ Consider the following stateme

1, 2, 3

1, 3, 4

2, 3, 4

1, 2, 4

⇒ Which of the following is not between F

_{2}layer and D layer?

E layer

F

_{1}layer

G region

All of the above

⇒ If V = 100 ∠ 16°, the (V) is

10 ∠ 32°

10 ∠ 8°

10 ∠ 16°

10 ∠ 4°

⇒ If the carrier modulated by a digital bit stream has one of the possible phases of 0°, 90°, 180° and 270°. Then the modulation is called

BPSK

QPSK

QAM

MSK

⇒ The function shown in figure, can represent a probability density function for A ________

*A*= 1/4

*A*= 1/6

*A*= 1/8

*A*= 1/2

⇒ A 1000

*k*H

*z*carrier wave modulated 40% at 4000 H

*z*is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after transmission through this circuit?

0.4

0.2

0.27

0.54

⇒ In 8085 microprocessor system, what will be the total delay provided by the following loop.

*msec*

3.514

*msec*

2.644

*msec*

3.166

*msec*

⇒ Which group of instructions is used to change sequence of operations in a computer program?

Data transfer group

Branch group

Arithmetic group

Logic group

⇒

**Assertion (A):** Heaviside partial expansion gives a simple procedure to find inverse Laplace transform of the terms having a complex conjugate pair of roots.

**Reason (R):** If I(*s*) = P(*s*)/Q(*s*) and all roots of Q(*s*) = 0 are simple, *i*(*t*) will have terms with exponentials having real exponents only.

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

⇒ In figure I

_{D}= 4 mA. Then V

_{GS4.4 V-4.4 V0.44 V-0.44 V}

⇒ If a 'live' conductor of a public supply touches earth metal

supply voltage will increase

supply voltage will decrease

no current will flow

current will flow to earth

⇒ When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.

273

243

170

123

⇒ Wave A starts its positive half cycle at ω

*t*= 30° and wave B starts its positive half cycle at ω

*t*= 75° then wave B is leading wave A by 45°.

TRUE

FALSE

⇒ Unit of e is __________ .

coulomb/newton-metre

coulomb

^{2}/newton-metre

Farad/metre

Farad

^{2}/metre