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Q1. | The temperature coefficient of resistivity of semiconductors is |

A. | positive [Wrong Answer] |

B. | negative [Correct Answer] |

C. | may be positive or negative [Wrong Answer] |

D. | very low [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 given figure shows three Nyquist plots of G(

*s*) H(

*s*) =

*e*/[

^{-sT}*s*(

*s*+ 1)] for different values of T. The curves 1, 2, 3 ca

for T = 0, 0.5 and 1 respectively

for T = 1, 0.5 and 0 respectively

for T = 0.5, 1 and 0 respectively

for T = 0, 1 and 0.5 respectively

⇒ MS Excel is an application software for financial planning.

TRUE

FALSE

⇒ A chopper is a high efficiency circuit.

TRUE

FALSE

⇒ What is the purpose of a start in RS232 serial communication protocol?

To synchronise receiver for receiving every byte

To synchronise receiver for receiving a sequence of byte

Acts as a parity bit

To synchronise receiver for receiving the last byte

⇒ A certain transistor has a

_{dc}of 0.98 and a collectors leakage current of 5 μA. If I

_{E}= 1 mA, the collector current will be

1.005 mA

0.985 mA

0.975 mA

0.955 mA

⇒ In a minimum function

the degree of numerator is higher than that of denominator

the degree of numerator is lower than that of denominator

the degree of numerator and denominator are equal

the denominator is a constant

⇒ A point charge of 6 μC is located at the origin, uniform line charge density of 180

*n*C/

*m*of 8

*m*length lies along the

*x*axis and a uniform sheet of charge equal to 25

*n*C/

*m*

^{2}of area p x 4

^{2}lies in the

*z*= 0 plane. Calculate total electric flux leaving the surface of sphere of 4

*m*radius centered at origin.

86.97 μC

8.697

*n*C

8.697 μC

86.97

*n*C

⇒ If the numerator of Z(

*s*) is one degree higher than denominator, Z(

*s*) has a pole at infinity.

TRUE

FALSE

⇒ Which capacitor-store higher amount of energy?

Air capacitor

Paper capacitor

Mica capacitor

Plastic film capacitor

⇒ For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V

_{1}(

*t*) = 2 sin 10

^{3}

*t*. The output voltage V

_{0}(

*t*) is equa

sin (10

^{3}

*t*- 45°)

sin (10

^{3}

*t*+ 45°)

sin (10

^{3}

*t*- 53°)

sin (10

^{3}

*t*+ 53°)

⇒ The real part of complex dielectric constant and tanδ for a dielectric are 2.1 and 5 x 10

^{-4}at 100 Hz respectively. The imaginary part of dielectric constant at 100 Hz is

1.05 x 10

^{-3}

2.1 x 10

^{-3}

5 x 10

^{-3}

1.05 x 10

^{-2}

⇒ A digital watch contains

quartz crystal oscillator

RC oscillator

LC oscillator

either quartz or RC oscillator

⇒ What is meant by "continuous collector current" in BJT?

Maximum collector current

Current at Quiescent condition

Leakage current

Junction Capacitance charging and discharging current

⇒ Negative feedback in amplifier

reduces gain

increases frequency and phase distortion

reduces bandwidth

increases noise

⇒ In N channel MOSFET with gate reverse biased, the gate current is of the order

10

^{-3}amp

10

^{-6}amp

10

^{-9}amp

10

^{-12}amp

⇒ The speeds used in recording audio programs in house hold recorders are

38 cm/s and 9.5 cm/s

38 cm/s and 19 cm/s

9.5 cm/s and 4.75 cm/s

38 cm/s and 4.75 cm/s

⇒

*e*

^{-3}

*is a*

^{t}energy signal

power signal

Both (a) and (b)

none

⇒ In a reactance function

all poles are simple

all poles and zeros are simple

all poles and zeros are simple and lie on

*j*ω axis only

all poles and zeros lie on negative real axis

⇒ A permeable substance is one

which is strong magnet

which is a weak magnet

which is a good conductor

through which magnetic lines of force can pass easily

⇒ A memory chip has 65536 cells in it. Then

time required to access cell is same as that to access cell 65536

time required to access cell is less than that required to access cell 65536

time required to access cell is more than that required to access cell 65536

either (a) or (b)

⇒ A thyristor has maximum allowable junction temperature of 110° C and the ambient temperature is 40°C, If the maximum internal power dissipation is 50 W, the thermal resistance is

2° C/W

1.4° C/W

0.7°C/W

2.2° C/W

⇒ Calculate the directivity of an antenna for θ

_{E}= 30°, θ

_{H}= 60

46

23

50

100

⇒ In VCR, the chrominance signal's frequency is

up converted during recording and down converted during playback

down converted during recording and up converted during playback

not changed during recording and playback

any of the above depending on VCR system

⇒ Which of the following can be used as a rotating amplifier in a control system?

- Amplidyne
- Separately excited dc generator
- Synchro
- Self excited dc generator

3 and 4

1 and 2

1, 2 and 3

all

⇒ Poynting vector is associated with

flux in magnetic field

power flow in electrostatic field

current in electrostatic field

charge in electrostatic field

⇒ In open circuit impedance parameters, the independent variables are

I

_{1}and I

_{2}

V

_{1}and V

_{2}

V

_{1}and I

_{1}

V

_{2}and I

_{2}

⇒ The static equalisation circuit for thyristors connected in series is

one resistor in series with each thyristor

one resistor in parallel with each thyristor

one resistor and one capacitor in parallel with each thyristor

none of the above

⇒ The organisatioion of Intel memory chip 127256 is

32 K x 8

16 K x 8

32 K x 4

16 K x 4

⇒ The action of backward wave oscillator is similar to that of

klystron amplifier

reflex klystron oscillator

TWT

magnetron

⇒ The most commonly used devices for differencing and amplification, in control systems, are

BJT amplifiers

FET amplifiers

operational amplifiers

either (a) or (b)