Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | The mean free path of conduction electrons in copper is about 4 x 10^{-8} m. For a copper block, find the electric field which can give, on an average, 1 eV energy to a conduction electron |

A. | 2.62 x 10^{7} V/m [Wrong Answer] |

B. | 2.64 x 10^{7} V/m [Wrong Answer] |

C. | 2.5 x 10^{7} V/m [Correct Answer] |

D. | 2.58 x 10^{7} V/m [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 synthesis of minimum function was suggested by

O'Brune

R. Richards

Bott and Duffin

none of the above

⇒ An one sided abrupt junction has 10

^{21}/m

^{3}of dopants on the lightly doped side, zero bias voltage and a built-in potential of 0.2 V. The depletion width of abrupt junction.(

*q*= 1.6 x 10

^{-19}C, ε

_{r}=16, ε

_{0}= 8.87 x 10

^{-12}F/

*m*) is

0.036 nm

0.6 μm

3 mm

1.5 mm

⇒

Match the following:

List I (Logic family) | List II (Characteristic) | ||
---|---|---|---|

A. | TTL | 1. | Maximum power consumption |

B. | ECL | 2. | Highest packing density |

C. | NMOS | 3. | Least power consumption |

D. | CMOS | 4. | Saturated Logic |

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

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

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

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

⇒ Determine the voltage V

_{CB}in the circuit bel

3.4 V

5.4 V

7.4 V

9.4 V

⇒

Match the following:

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

A. | Detection of a periodic signal in noise | 1. | Increase in bandwidth |

B. | Recovery of a band limited signal from its uniformly sampled values | 2. | Slope overload error |

C. | Finer quantization of signal | 3. | Nyquist rate |

D. | Delta modulation | 4. | Cross correlation |

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

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

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

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

⇒ Which of the following term does not apply to the Yagi-Uda array?

High gain

Folded dipole

Parasitic

Good bandwidth

⇒ In following figure, the initial contents of the 4-bit serial in parallel out, right shift, shift register as shown in figure are 0110. After 3 clock pulses the contents of the shift register wil

0

101

1010

1110

⇒ A linear diode detector uses RC filter. As modulation index increases the maximum permissible value of time constant RC

increases

decreases

remains constant

either (a) or (c)

⇒ A pure tone at 1000 Hz has a dB level of 40 dB. If the required dB level is 100, the number of such tones is

2.5

60

10

^{4}

10

^{6}

⇒ A high resistance was measured by loss of charge method. The voltmeter resistance was 10

^{10}ohms. The calculation gave the value of unknown resistance as 0.8 x 10

^{9}ohms. The true value of resistance is

0.8 x 10

^{9}Ω

less than 0.8 x 10

^{9}Ω

more than 0.8 x 10

^{9}Ω

either (b) or (c)

⇒ In an intrinsic semiconductor, at a given temperature T

the number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

the number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination

the number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

any of the above

⇒ Terra-watt is equal to

10

^{3}W

10

^{6}W

10

^{9}W

10

^{12}W

⇒ The distance at which a sky wave is received back on earth decreases with angle of incidence for all angles of incidence.

TRUE

FALSE

⇒ A rectangular metal waveguide filled with a dielectric of relative permittivity ε

_{r}= 4, has the inside dimensions 3 x 1.2 cm, the cut off frequency for the dominant mode is

2.5 GHz

5 GHz

10 GHz

12.5 GHz

⇒ The spins in a ferrimagnetic material are

all aligned parallel

partially aligned antiparallel without exactly cancelling out sublattice magnetisation

randomly oriented

all aligned antiparallel such that the sublattice cancels out exactly

⇒ Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is

10 mH

15 mH

30 mH

90 mH

⇒ A periodic rectangular signal,

*x*(

*t*) has the waveform shown in the given figure. Frequency of the fifth harmonic of its spectrum is _______

200 Hz

250 Hz

400 Hz

1250 Hz

⇒ The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

sign of charge carrier

density of charge carrier

both sign and density of charge carrier

none of the above

⇒ CD4010 is a

inverting buffer

non-inverting hex buffer

NOR IC

NAND IC

⇒ For real and odd signals, the Fourier series coefficient

*a*is

_{n}purely imaginary

purely real and even

purely imaginary and odd

purely real and odd

⇒ The hexadecimal number 'A0' has the decimal value

80

256

100

160

⇒

**Assertion (A):** The variable name 5KING is not valid in Fortran 77.

**Reason (R):** In Fortran 77 the first character of a variable name must be an alphabet.

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 correct R is wrong

A is wrong R is correct

⇒ A complementary symmetry amplifier has

1 P-N-P and 1 N-P-N transistor

2 P-N-P transistor

2 N-P-N transistor

2 P-channel FETs

⇒ Which of these has highly doped

*p*and

*n*region?

PIN diode

Tunnel diode

Schottky diode

Photodiode

⇒ Elements R, L, C are connected in parallel and excited by a dc current I. If

*i*

_{R},

*i*

_{L}and

*i*

_{C}are the currents through R, L, C respectively then at

*t*= 0

*i*

_{R}>

*i*

_{L}>

*i*

_{C}

*i*

_{L}>

*i*

_{R}>

*i*

_{C}

*i*

_{C}= 0

*i*

_{C}= I

⇒ The intrinsic resistivity of silicon at 300 K is about

1 Ω-cm

400 Ω-cm

10000 Ω-cm

230000 Ω-cm

⇒ In a 4 bit counter the output of 3 JK FFs from MSB downward are connected to the NAND gate whose O/P is connected to CLR

it is a MOD-14 counter

it is MOD-13 counter

it is divided by 13 counter

it is divide by 10 counter

⇒ In which mode of rectangular waveguide are all field components zero?

TM

_{00}

TM

_{11}

TM

_{01}

TM

_{10}

⇒ A series R, L, C circuit has R = 2Ω, L = 1H, C = 1 μF. It is connected to an ac variable frequency source of peak voltage 10 V. At resonance the power supplied by the source will be

50 Ω

25 Ω

12.5 Ω

6.25 Ω

⇒ The impulse response

*h*[

*n*] of a linear time invariant system is given by

*h*[

*n*] = ∪[

*n*+ 3 ] + ∪[

*n*- 2] -2∪[

*n*-7]. The above system is

stable but non-casual

stable and casual

casual but unstable

unstable and not casual