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Q1. | Which of following digital modulation technique? |

A. | ASK [Wrong Answer] |

B. | FSK [Wrong Answer] |

C. | PSK [Wrong Answer] |

D. | All [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 :**

⇒ The phase angle corresponding to λ/4 in a standing-wave pattern is

30°

90°

135°

180°

⇒ A parametric amplifier uses

non linear resistance

non linear reactance

either (a) or (b)

neither (a) nor (b)

⇒ Out of the three transforms viz. Z-transform, Laplace transform and Fourier transform

all three are used in continuous time domain

all three are used in both continuous time domain and discrete time domain

Z transform is used in continuous time domain while Laplace and Fourier transforms are used in discrete time domain

Z transform is used is discrete time domain while Laplace and Fourier transforms are used in continuous time domain

⇒ In auxiliary commutated chopper, the peak value of thyristor current is

equal to peak value of load current

equal to peak value of capacitor current

sum of peak value of load current and capacitor current

none of the above

⇒ An electrodynamometer instrument has the advantage of

freedom from hysteresis and eddy currents because air cored coils are used

freedom from hysteresis and eddy currents because cores of coils have special ferromagnetic material

high torque/weight ratio

low cost

⇒ The disturbance from adjacent power lines is known as

cross talk

cross fire

inductive disturbance

none of the above

⇒ For an ac sinusoidal wave, the rms value is 10 A. For the same wave delayed by 60° in each half cycle, the rms value is likely to be

0.416666666666667

7.07 A

6.35 A

3.5 A

⇒ Which of the following is used in temperature alarm circuits?

Thermistor

Photoconductor

Transistor

Varistor

⇒ The scale of moving iron instrument is linear.

TRUE

FALSE

⇒ In measurements using strain gauge, the dummy strain gauge is used to

compensate for resistance of strain gauge

compensate for change in temperature

compensate for error due to change in voltage of battery

compensate for error in voltmeter

⇒ Kirchoff's laws are applicable to

steady state conditions only

transient conditions only

both steady state and transient condition

both steady state and transient condition but with some constraints

⇒

Match the following:

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

A. | Word wrap | 1. | interleaved execution of two or more programs by the same computer |

B. | Client | 2. | automatically moves a word to the next line if it does not fit in the current line |

C. | Multitasking | 3. | an application receiving data |

D. | Landscape | 4. | orientation of worksheet |

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

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

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

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

⇒ Which of the following statements is not correct regarding modes of electromagnetic energy transmission?

In TE mode the direction of electric field is always and everywhere transverse to the direction of propagation

In TM mode the magnetic field pattern is always and everywhere transverse to the direction of propagation

The subscripts is TE and TM designations denote the number of half sine wave variations of the field components in x and y directions respectively.

TM

_{11}is called the dominant mode.

⇒ Insulation resistance of a cable is directly proportional to its length.

TRUE

FALSE

⇒ Which of the following statement is correct?

Decimal 9 is represented as 1011 in Excess-3 code

Decimal 9 is represented as 1001 is BCD code

Decimal 10 is represented as 1100 is Gray code

Decimal 10 is represented as 1001 in binary code

⇒ Electric dipole moment is usually expressed in debye units. Here, 1 debye unit equals

3.33 x 10

^{-30}C-

*m*

3.33 x 10

^{-30}C-

*m*

^{2}

3.30 x 10

^{-10}C-

*m*

3.33 x 10

^{-10}C-

*m*

^{2}

⇒ In oscillators class C operation is preferred because

is most efficient

has frequency stability

gives larger output

it produces nearly square waves

⇒ The quiescent collector current I

_{C}, and collector to emitter voltage V

_{CE}in a CE connection are the values when

ac signal is zero

ac signal is low

ac signal is negative

either (a) or (b)

⇒ Which of the following is not a proper FORTRAN expression?

B + A / C - D

(A + C) / (B + D)

B + * A / C

A ** (B + 2)

⇒ In an amplifier the stray capacitances assume impedance at low frequencies

TRUE

FALSE

⇒

**Assertion (A):** In a perfect capacitor, the current density is given by ω ∈_{0}E_{0}∈^{'}_{r}cos(ω*t* + 90°), where ∈_{r}^{'} is real part of dielectric constant.

**Reason (R):** In a perfect capacitor, dielectric losses are zero.

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 but R is false

A is false but R is true

⇒ Figure repres

Integrator

Differentiator

High Pass Filter

Band Pass Filter

⇒ The damping ratio of a pair of complex poles when expressed in terms of angle θ measured from

*j*ω axis equal to

sin θ

cos θ

tan θ

cot θ

⇒ During day time ionosphere can be considered to be consisting of

D, E, F

_{1}and F

_{2}layers

D, E, F

_{1}layers

D, E, F

_{2}layers

D and E layers

⇒ Work function of oxide coated cathode is much lower than that of tungsten cathode.

TRUE

FALSE

⇒ The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is

555 kHz

505 kHz

500 kHz

9 kHz

⇒ In a triode

grid is nearer to cathode than anode

grid is nearer to anode than cathode

grid is equidistant from anode and cathode

any of the above

⇒ Self bias is an example of __________ feedback that tends to stabilize the drain current against changes in temperature and JFET replacement.

variable

low

negative

positive

⇒ The circuit in figure, is to be scaled to an impedance level of 5kΩ and resonant frequency of 5 x 10

^{6}rad/sec. The possible combination of R, L,

2.5Ω, 0.2 mH, 200 pF

5 kΩ, 0.2 mH, 200 pF

5 kΩ, 0.2 mH, 200 μF

5 kΩ, 0.1 mH, 0.4 μF

⇒ In a single phase power factor meter the phase difference between currents in the two pressure coils is

exactly 0°

approximate 0°

exactly 90°

approximate 90°