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Q1. | A 1 MHz sinusoidal carrier is amplitude modulated by a symmetrical square wave of period 100 μ sec. Which of the following frequencies will not be in the modulated signal? |

A. | 990 kHz [Wrong Answer] |

B. | 1010 kHz [Wrong Answer] |

C. | 1020 kHz [Correct Answer] |

D. | 1030 kHz [Wrong Answer] |

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

⇒

Match the following:

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

A. | Total instantaneous value of emitter current | 1. | I_{E} |

B. | Quiescent value of emitter current | 2. | i_{E} |

C. | Instantaneous value of as component of emitter current | 3. | I_{e} |

D. | RMS value of ac component of emitter current | 4. | i_{e} |

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

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

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

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

⇒ Which of the following best represents the input impedance of an actual op-amp?

10 ohm

1 k ohm

1 M ohm

100 M ohm

⇒ If the frequency of a wave 20 Hz, the time period is

20 secs

2 secs

0.2 secs

0.05 secs

⇒ The binary number 0.10110111101 is equal to hexadecimal number

B3A

B5A

B7A

BA7

⇒ In plotting line spectrum

a graph of complex number F

_{n}versus frequency is plotted

a graph of |F

_{n}| versus frequency is plotted

a graph of the angle of F

_{n}versus frequency is plotted

two graphs viz |F

_{n}| versus frequency and the phase angle of F

*n*versus frequency are plotted

⇒ An FM transmitter has maximum frequency deviation of 75 kHz and reproduces audio signals up to 15 kHz. Minimum channel width required is __________ kHz.

180

120

90

60

⇒ The trigonometric Fourier series for the waveform

*f(t)*shown below con

only cosine terms and zero value for the dc component

only cosine terms and a positive value for the dc component

only cosine terms and a negative value for the dc component

only sine terms and a negative for the dc component

⇒ If

*x*= 0.1396 radians, the values of 1 - cos

*x*and 2 sin

^{2}(x / 2) using floating point arithmetic with a 4 digit mantissa are respectively

.1000 E - 1 each

.9727 E - 2 each

.1000 E - 1 and .9727 E - 2 respectively

.9727 E - 2 and .1000 E - 1 respectively

⇒ A 4 bit binary adder has 4 full adders.

TRUE

FALSE

⇒ If the network in figure (1), (2) are equivalent at terminals A - B, then voltage V and resistance R

100V and 12 Ω

60V and 12 Ω

100V and 30 Ω

60V and 30 Ω

⇒ If D is mouth diameter of a paraboloid reflector, its directivity is proportional to

D

D

^{2}

D

D

^{3}

⇒

**Assertion (A):** In a circuit having high inductance, reactive power may be more than apparent power.

**Reason (R):** Reactive power = VI sin θ.

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

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

A is true but R is false

A is false but R is true

⇒ Given two numbers A and B in sign magnitude representation in an eight bit format A = 00011110 and B = 10011100 then A ⊕ B gives

10000010

11111

10011101

11100001

⇒ In the decimal number 27, the digital 2 represents

2

20

0.2

200

⇒ In AM receiver the oscillator frequency is

always equal to signal frequency

always equal to 455 kHz

always higher than signal frequency

always lower than signal frequency

⇒ In a multi-processor configuration two coprocessors are connected to host 8086 processor. The instruction sets of the two coprocessors

must be same

may overlap

must be disjoint

must be the same as that of host

⇒ Which of the following methods is used for solving differential equations numerically?

Runge-Kutta method

Gauss-elimination method

Newton-Raphson method

Any one of these

⇒ A constant

*k*low pass filter has

*f*

_{c}= 500 Hz. At

*f*= 1000 Hz, the attenuation is

zero

infinity

may be zero or infinity

more than zero but less than infinity

⇒ Which of the following is not treated as hexadecimal constant by assembler in 8085?

45 H

6 AFH

234

64 H

⇒ Figure represen

JFET shunt switching circuit

JFET series switching circuit

JFET analog switch

multiplexing

⇒ In a bridge rectifier circuit the rms value of input ac voltage is 10 V. The PIV across each diode is

7.07 V

14.14 V

10 V

28.28 V

⇒ The counter shown in the given figure

Synchronous

Johnson

Ring

None of the above

⇒ In a 3 phase full converter, the instantaneous output voltage can have negative part if

firing angle is less than 60°

firing angle is less than 90°

firing angle is more than 60°

firing angle is more than 90°

⇒ Quantization error occurs in

D/A converter

A/D converter

both D/A and A/D converter

neither D/A nor A/D converter

⇒ If A = 4∠7°, A

^{2}is

16∠14°

16∠49°

16∠7°

16∠3.5

⇒ A thermometer requires 1 minute to indicate 98% of its final response to a step input. If it is a first order system the time constant is

1 minute

0.5 minute

0.25 minute

0.1 minute

⇒ The number of cells in a 4 variable K map is

16

8

4

32

⇒ A buffer is

always non-inverting

always inverting

inverting or non-inverting

none of the above

⇒ Which of the following pairs of octal and binary numbers are not equal?

111 11011

_{2}= 767

_{8}

110110101

_{2}= 665

_{8}

11010

_{2}= 3

_{8}

10101.11

_{2}= 25.6

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⇒ A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

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statistically independent

uncorrelated

orthogonal