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Q1. | The band gap of silicon at 300K is |

A. | 1.36 eV [Wrong Answer] |

B. | 1.10 eV [Correct Answer] |

C. | 0.80 eV [Wrong Answer] |

D. | 0.67 eV [Wrong Answer] |

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

⇒ A two port network is said to be reciprocal if

*h*

_{12}= -

*h*

_{21}

AD - BC = 1

*y*

_{12}=

*y*

_{21}

all

⇒ An RLC series circuit is underdamped. To make it overdamped, the value of R

has to be increased

has to be decreased

has to be increased to infinity

has to be reduced to zero

⇒ A Hartley oscillator uses

a tapped inductor

a tapped capacitor

both (a) and (b)

neither (a) nor (b)

⇒ An engineer designs an amplifier to have a voltage gain of 60, but when constructed it only had a gain of 50. How much feedback should be used to provide the desired level?

0.0003

0.0033

0.013

0.033

⇒ When a current flows through a conductor,

an electric field exists at all points within the conductor

electric field exists only at all points on the surface of the conductor

electric field exists only at ends of the conductor

any of the above depending on magnitude of current

⇒ How many different binary numbers can be stored in a register consisting of six switches?

16

32

64

128

⇒ In a series L-C circuit fed by ac voltage, voltage drops across L and C are 40 V and 30 V respectively. The supply voltage is

70 V

10 V

50 V

1.333 V

⇒ In figure

*v*

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60 mV dc

110 mV dc

130 mV dc

150 mV dc

⇒ Consider the following program for 8085

decimal 40

decimal 10

none of the above

⇒ A good ohmic contact on a P-type semiconductor chip is formed by introducing

gold as an impurity below the contact

high concentration of donors below the contact

high concentration of acceptors below the contact

thin insulator layer between the metal and semiconductor

⇒ In control systems the magnitude of error voltage

is very small

is very large

neither small nor large

may be any value from 0 to 50 V

⇒ Two coupled coils lie in parallel planes such that 50% of magnetic flux produced by one links the other. The coefficient of coupling is

0.5

0.25

0.125

0.5

⇒ As compared to MOS memories, bipolar memories have

slower access time but are cheaper

slower access time and are costly

faster access time and are cheaper

faster access time and are costly

⇒ A ripple counter has 4 bits and uses flip flops with propagation delay time of 25 ns. The maximum possible time for change of state will be

25 ns

50 ns

75 ns

100 ns

⇒ A line of characteristic impedance Z

_{0}branches into two line each with characteristic impedance Z

_{0}. The refracted voltage is

zero

infinite

equal to incident voltage

two third of incident voltage

⇒ Resistivity of copper is nearly

1.56 μ ohm-cm

3.95 μ ohm-cm

14.55 μ ohm-cm

22.05 μ ohm-cm

⇒ A transmitter radiates a power 20 KW and its base current is 18A. The radiation resistance of the antenna is

1111 Ω

900 Ω

75 Ω

62 Ω

⇒ In a single phase full wave ac regulator, the firing angles in the two half cycles

are always equal

are sometimes equal

are never equal

may be equal or unequal

⇒ In the following transistor circuit

*V*

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_{c}_{E}, and β and the capacitance are very l

1 mA

2 mA

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⇒ A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?

0.4

0.2

0.27

0.54

⇒ Directivity and beamwidth is related as

D ∝ B

D ∝ 1/B

D ∝ B

D ∝ B

^{2}

⇒ Which of the following types of noise assumes greater importance at high frequencies?

Transit time noise

Shot noise

Impulse noise

Random noise

⇒ Two resistances are : R

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_{2}= 75 Ω ± 3.75 Ω. The sum R

_{1}+ R

_{2}along with limiting error is

111 Ω ± 1.8 Ω

111 Ω ± 3.75 Ω

111 Ω ± 5.55 Ω

111 Ω ± 1.95 Ω

⇒ An enhancement mode MOSFET is on when the gate voltage is

zero

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high

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⇒ Which one is correct statement?

- Circuit is always open
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- Circuit is always closed
- Network is always closed

1, 2

2, 3

3, 4

1, 4

⇒ A TEM wave incident obliquely on a dielectric boundary with ε

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_{r2}= 1, the angle of incidence for total reflection is

30°

60°

45°

90°

⇒ The percentage saving in power of 100% modulated suppressed carrier AM signal is

100

75

66.6

50

⇒

Match the following:

List I (Transducer) | List II (Operation) | ||
---|---|---|---|

A. | Bourden tube | 1. | Fluid flow to resistance change |

B. | Hot wire ammeter | 2. | Velocity to pressure |

C. | Hydrometer | 3. | Pressure to displacement |

D. | Pitot tube | 4. | Specific gravity to displacement |

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

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

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

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

⇒ Ferrite have

low copper loss

low eddy current loss

low resistivity

higher specific gravity compared to iron

⇒ The symbol in figure is

UJT

PUT

SCS

SBS