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Q1. | If F(t) = δ(t - a), F(s)= |

A. | 0 [Wrong Answer] |

B. | 1 [Wrong Answer] |

C. | e^{-as} [Correct Answer] |

D. | e [Wrong Answer]^{as} |

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

⇒ In which of the following device electrons will be the majority carriers?

P-type semiconductor

N-type semiconductor

N-P-N transistor

P-N-P transistor

⇒ 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

⇒ If N bits are lumped together to get an N-bit symbol, the possible number of symbols is

2

^{N}

2

^{N - 1}

2

^{N - 2}

2

^{N - 4}

⇒ The HV and other voltage supplies for a TV receiver are obtained from IHVT. The full name for this device is

Internal high voltage transformer

Integrated high voltage transformer

Instant high voltage transformer

Interleaved high voltage transformer

⇒ Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is

115.2 kbps

28.8 kbps

57.6 kbps

38.4 kbps

⇒ If V = 4 in the figure, the value of I

_{S}is given

0.25

5/2 A

0

None of these

⇒ An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then

the polarity of voltage across R is same during discharge and during charge

the polarity of voltage across R during discharging is opposite to that during charging

the polarity of voltage across R depends on time constant RC

none of the above

⇒

Match the following:

List I (Laws of Boolean) | List II (Relation algebra) | ||
---|---|---|---|

A. | Distributive law | 1. | x + x = x |

B. | DeMorgans law | 2. | x(y + z) = xy + xz |

C. | Idempotent law | 3. | (x) = x |

D. | Involution law | 4. | (x + y) = xy |

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

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

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

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

⇒ When .4546 E 5 and .5433 E 7 are to be added in normalized floating point mode

none of the numbers is changed to any other form

.4546 E 5 is changed .004546 E 7 and .5433 E 7 is not changed

.5433 E 7 is changed to 54.33 E 5 and .4546 E 5 is not changed

both the numbers are changed and their exponents are made equal to 6

⇒ Photoelectric effect occurs only in semiconductors and not in metals.

TRUE

FALSE

⇒ The width of a radio beam from a 1 m diameter parabolic antenna at 1 GHz is about

100°

50°

5°

2°

⇒ Determine the potential difference between the points A and B in the steady s

40 V

60 V

25 V

75 V

⇒ In the spectrum of a FM wave

the carrier frequency cannot disappear

the carrier frequency disappears when the modulation index is large

the amplitude of any sideband depends on the modulation index

the total number of sidebands depends on the modulation index

⇒ As per BIS there are 6 accuracy classes of instruments.

TRUE

FALSE

⇒ In a uniformly doped BJT, assume that N

_{E}, N

_{B}and N

_{C}are the emitter, base and collector dopings in atoms/cm

^{3}, respectively. If the emitter injection efficiency of the BJT is close unity, which one of the following conditions is TRUE?

N

_{E}= N

_{B}= N

_{C}

N

_{E}>> N

_{B}and N

_{B}> N

_{C}

N

_{E}= N

_{B}and N

_{B}< N

_{C}

N

_{E}< N

_{B}< N

_{C}

⇒ Drift velocity of electrons is generally less than 1 mm/s.

TRUE

FALSE

⇒ The directive gain of λ/2 resonant wire is 1.64.

TRUE

FALSE

⇒ The number of doped regions in a SCR is

2

3

4

5

⇒ Serial in-serial out shift register can be built using D flip flops.

TRUE

FALSE

⇒ If number of information bits is 11, the number of parity bits in Hamming code is

5

4

3

2

⇒ A 4 bit transistor register has output voltage of high-low-high-low. The binary number stored and its decimal equivalent are

0101 and 5

0101 and 10

1010 and 5

1010 and 10

⇒ A sheet of bakelite is inserted between the plates of an air capacitor. The capacitance will

increase

decrease

remain the same

may increase or decrease

⇒ The approximate value of input impedance of CE amplifier with emitter resistance R

_{E}is given by

*h*

_{ie}+ A

_{i}R

_{E}

*h*

_{ie}+ (1 +

*h*

_{fe}) R

_{E}

*h*

_{ie}

(1 +

*h*

_{fe}) R

_{E}

⇒ Which of the following has unique representation of 0?

sign magnitude

1's complement

2's complement

both (b) and (c)

⇒ Two capacitors of 20 μF each are in series. The total capacitance is

5 μF

10 μF

40 μF

400 μF

⇒ A line is excited by a 100 V, 200 ohm source and is terminated by 100 Ω resistance. If the voltage on line reaches steady value in 80

*ns*, the natural resonant frequency is

100 MHz

50 MHz

12.5 MHz

6.25 MHz

⇒ If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is given

3.0 x 10

^{8}m/sec

2 x 10

^{8}m/sec

6.28 x 10

^{7}m/sec

2 x 10

^{7}m/sec

⇒ 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

⇒ In 2 out of 5 code, decimal number 8 is

11000

10100

11000

1010

⇒ The resistivity of a semiconductor

increases as the temperature increases

decreases as the temperature increases

remains constant even when temperature varies

none of the above