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Q1. | A heavily doped semiconductor exhibits a __________ such a device is called sensistors. |

A. | negative temperature coefficient of resistance [Wrong Answer] |

B. | positive temperature coefficient of resistance till a particular value of temperature and then it shown negative temperature coefficient of resistance [Wrong Answer] |

C. | positive temperature coefficient of resistance [Correct Answer] |

D. | none of the above [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 conduction band is

same as forbidden energy gap

generally located on the top of the crystal

generally located on the bottom of the crystal

a range of energies corresponding to the energies of the free electrons

⇒ (FE35)

_{16}XOR (CB15)

_{16}is equal to

(3320)

_{16}

(FE35)

_{16}

(FF50)

_{16}

(3520)

_{16}

⇒ The slope of log magnitude curve near the cut off frequency is called cut off rate.

TRUE

FALSE

⇒ The divergence of the electric field intensity at any point equals

1/4 pε

_{0}times the volume charge density

l/ε

_{0}times the volume charge density at that point

ε

_{0}times the volume charge density at that point

the volume charge density at that point

⇒ If a microcomputer has a 64 K memory; what is the hexadecimal notations for the last memory location?

1111

1A1A

EEEF

FFFF

⇒ The total number of leads in SUS, SBS and SCS respectively are

3, 3, 4,

3, 3, 3

2, 3, 3

3, 3, 5

⇒ Choose the correct match for input resistance of various amplifier configurations shown below configurat

CB-LO, CC-MO, CE-HI

CB-LO, CC-HI, CE-MO

CB-MO, CC-HI, CE-LO

CB-HI, CC-LO, CE-MO

⇒ A horizontal output stage is cutoff for retrace and 40% of trace. If time for each horizontal line is 64 μs and retrace time is 12 μs, the transistor is conducting for about

64 μs

6.4 μs

31 μs

3.1 μs

⇒ The IF stage of a receiver employs

capacitive coupling

impedance coupling

double-tuned transformer coupling

single-tuned transformer coupling

⇒ Which of the following can be used as a tachogenerator in control systems?

Microsyn

DC servomotor

AC servomotor

Magnetic amplifier

⇒ A total of 16 equally probable events exist. If it is required to select one out of them, the number of required bits is

2

4

3

5

⇒ A system is stable if ROC

include the unit circle

exclude the unit circle

lies on Circle

entire plane

⇒ A low noise device is most important

at front end of equipment

in the last stage of equipment

in the middle stages of equipment

both (b) and (c)

⇒ For the circuit shown in the figure, D has a transition from 0 to 1 after CLK changes from 1 to 0. Assume gate delays to be neglig

Q goes to 1 to the CLK transition and stays at 1

Q goes to 0 at the CLK transition and stays at 10

Q goes to 1 at the CLK transition and goes to 0 when D goes to 1

Q goes to 0 at the CLK transition and goes to 1 when D goes to 1

⇒ A binary with a digits, all of which are unity has the value

*n*

^{2}- 1

2

^{n}2(

^{n - 1})

2

^{n}- 1

⇒ A clamper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒

Match the following:

List I (Symbol in Java comparison operator) | List II (Meaning) | ||
---|---|---|---|

A. | = = | 1. | Greater than or equal to |

B. | ! = | 2. | Equal |

C. | > = | 3. | Not equal |

A-1, B-2, C-3

A-3, B-2, C-1

A-1, B-3, C-2

A-2, B-3, C-1

⇒ A 6 bit R-2

*R*ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts.

3% 7 V

6.4 V, 2%

0.1%, 1.57 V

1.57%, 0.1 V

⇒ A single element strain gauge bridge has two fixed resistances R

_{1}and R

_{1}of 120 Ω each and a variable resistance which gives full deflection at 120 Ω for zero strain and 120.6 Ω for straine

*e*. If gauge factor is 2, strain

*e*is

0.0025

0.0035

0.005

0.0075

⇒ For BJT transistor. The maximum power dissipation is specified as 350 mW if ambient temperature is 25°C. If ambient temperature is 60°C the maximum power dissipation should be limited to about

100 mW

250 mW

450 mW

600 mW

⇒ The units of μ

_{0}and μ

_{r}are

H/m for both

H/m for μ

_{r}and no units for μ

_{0}

H/m for μ

_{0}and no units for μ

_{r}

Wb/m for μ

_{0}and no units for μ

_{r}

⇒ In ac circuits maximum power is delivered to a load if load impedance is conjugate of source impedance.

TRUE

FALSE

⇒ The equation sin (

*z*) = 10 has

no real or complex solution

exactly two distinct complex solutions

a unique solution

an infinite number of complex solutions

⇒ Magnetic susceptibility of a medium is the ratio of

magnetic field strength to mmf

intensity of magnetization to magnetic flux density

intensity of magnetization to field strength

mmf to magnetic field strength

⇒ An ac circuit has two branches in parallel. The impedances of the two branches are equal. Their power factors are 0.8 lagging and 0.8 leading. The overall p.f. is

1

zero

about 0.7 lagging

about 0.7 leading

⇒ If F(

*j*ω) is the Fourier transform of

*f*(

*t*), then

£

*f*(-

*t*) = F(

*j*ω)

£

*f*(-

*t*) = F* (

*j*ω)

£

*f*(-

*t*) = F(-

*j*ω)

£

*f*(-

*t*) = F* (

*- j*ω)

⇒

Match the following:

List I (Signal) | List II (Value) | ||
---|---|---|---|

A. | AM | 1. | 0 0.5 |

B. | DSB - SC | 2. | 1 |

C. | SSB | 3. | 2 |

D. | FM (β = 2) | 4. | 16 |

E. | FM (β = 5) | 5. | 8 |

A-1, B-3, C-2, D-5, E-4

A-3, B-3, C-1, D-5, E-4

A-2, B-1, C-4, D-5, E-5

A-4, B-2, C-5, D-3, E-1

⇒ In a 3 phase bridge inverter with 120° mode of operation the. number of thyristors conducting at one time are

1

2

3

4

⇒

**Assertion (A):** Ferrites are very useful at very high frequencies.

**Reason (R):** Ferrites have high permeability and high resistivity.

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

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

A is true but R is false

A is false but R is true

⇒ Which inverter circuit uses coupled inductors?

Modified McMurray full bridge inverter

McMurray Bedford half bridge inverter

Modified McMurray Bedford half bridge inverter

Both (b) and (c)