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Q1. | If f(t) = - f(- t) and f(t) satisfies Dirichlet conditions, then f(t) can be expanded in Fourier series having |

A. | sine terms only [Correct Answer] |

B. | cosine terms only [Wrong Answer] |

C. | cosine and constant terms [Wrong Answer] |

D. | sine and constant term [Wrong Answer] |

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

⇒ In a ratio detector

the linearity is worse than in a phase discriminator

the output is twice that obtainable from a similar phase discriminator

stabilization against signal strength variations is provided

the circuit is the same as in a discriminator, except that the diodes are reversed

⇒ The noise generated by a resistor depends upon

its resistance value

its operating temperature

both its resistance value and operating temperature

none of the above

⇒ The impulse response

*h*(

*t*) of a linear time-invariant continuous time system is described by

*h*(

*t*) = exp (a

*t*)

*u*(

*t*) + exp (β

*t*)

*u*(-

*t*), where

*u*(

*t*) denotes the unit step function, and a and β are constants. This system is stable if

a is positive and β is positive

a is negative and β is negative

a is positive and β is negative

a is negative and β is positive

⇒ An excitation is applied to a system at

*t*= T, and its response is zero for -∞ <

*t*< T, such a system is

non-causal system

Stable system

causal system

unstable system

⇒ De-emphasis circuit is used

to attenuate high frequencies

to attenuate low frequencies

to attenuate mid-band frequencies

None of the above

⇒

**Assertion (A):** A multiplexer can be used for data routing.

**Reason (R):** A multiplexer has one input and many outputs.

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

⇒ Consider the following expressions which indicate the step or impulse response of an initially relaxed system

- [5 - 4
*e*^{-2t}]*u*(*t*) - [
*e*^{-2t}+ 5]*u*(*t*) *d*(*t*) + 8*e*^{-2t}*u*(*t*)*d*(*t*) + 4*e*^{-2t}*u*(*t*)

1 and 3

1 and 4

2 and 4

2 and 3

⇒ A load commutated chopper circuit has

one thyristor

two thyristors

four thyristors

six thyristors

⇒ The initial state of MOD-16 down counter is 011. After 37 clock pulses, the state of the counter will be

1011

110

101

1

⇒ The reading of the voltmeter in figure will be __________ v

100

150

zero

200

⇒ The number of bits in a nibble is

8

4

2

16

⇒ In a half bridge inverter, the freewheeling diodes are needed

even when load is resistive

only when load is inductive

only when load is inductive or capacitive

for all types of loads

⇒ The resistance of a metallic wire would

increase as the operating frequency increase

decrease as the operating frequency increase

remain unaffected on increasing the operating frequency

first increase then decrease

⇒ For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.

27.5 to 30

10 to 15

30 to 50

5 to 10

⇒ For a base current of 10 μA, what is the value of collector current in common emitter if β

_{dc}= 100

10 μA

100 μA

1 mA

10 mA

⇒ A rectangular waveguide is a

rectangular conducting wire to propagate electromagnetic waves

hollow rectangular walled room carrying electromagnetic wave

hollow rectangular conducting tube through which electromagnetic waves can be propagated

tube antenna to transmit and receive electromagnetic waves

⇒ The absorption of EM wave by the atmosphere depends on

polarization of waves

frequency in use

dist. from T

_{y}

height of antenna

⇒ In a communication receiver, a squelch circuit is normally inserted

before detector

after detector

before mixer

after power amplifier

⇒ Noise with uniform power spectral density of N

_{0}ω/H

_{z}is passed through a filter H(ω) = 2 exp (-J ω

*t*) followed by an ideal low pass filter of bandwidth B Hz. The output noise power in watts is

_{y}2 N

_{0}B

4 N

_{0}B

8 N

_{0}B

16 N

_{0}B

⇒ A radio frequency choke permits an easy flow of __________ current and at the same time it offers a very impedance to __________ currents.

A.C., low frequency

A.C., high frequency

D.C., low frequency

D.C. high frequency

⇒ The current passing through a resistance of 100 ± 0.2% Ω is 2 ± 0.5% A. The limiting error in computation of power will be

± 0.7%

± 0.9%

± 1.2%

± 0.3%

⇒ Photoelectric emitters in photo tubes are generally made of

alkali metals

metals

semiconductors

metal and semiconductors

⇒ Complex pole in z-plane is as shown below. This is the pole diagram for ________

Decaying sinusoidal sequence

Growing sinusoidal sequence

Decaying non sinusoidal sequence

Growing non sinusoidal sequence

⇒ For a second order system, the position of poles is in the shaded region shown in the given figure. The variation in damping facto

from 0 to 1

from about 0.3 to 0.7

from 1 to 5

from 0 to 3

⇒ In the circuit of figure, the value of

*r*

_{e}is (neglecting

*v*

_{be100 Ω75 Ω50 Ω25 Ω}

⇒ When a trivalent impurity is added, the semiconductor becomes

*p*type

*n*type

intrinsic

neutral

⇒ The critical frequency of 'F' layer is greater than 30 MHz.

TRUE

FALSE

⇒ Volume control found on the front panel of television receivers

a ganged resistor

a variable resistor of logarithmic type

a variable resistor of linear type

a trimmer potentiometer

⇒

Match the following:

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

A. | p type semiconductor | 1. | silicon |

B. | n type semiconductor | 2. | holes are majority carriers |

C. | Intrinsic semiconductor | 3. | electrons are majority carriers |

D. | Tungsten | 4. | is a metal |

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

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

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

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

⇒ Which of these instruments is dynamometers type?

Wattmeter

Power factor meter

Frequency meter

Both (a) and (b)