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Q1. | The material which has zero temperature coefficient of resistance is |

A. | manganin [Correct Answer] |

B. | porcelain [Wrong Answer] |

C. | carbon [Wrong Answer] |

D. | aluminium [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ Which one of the systems described by the following I/P - O/P relations is time invariant

*y*(

*n*) =

*n*

*x*(

*n*)

*y*(

*n*) =

*x*(

*n*) -

*x*(

*n*- 1)

*y*(

*n*) =

*x*(-

*n*)

*y*(

*n*) =

*x*(

*n*) cos 2p

*f*

_{0}

*n*

⇒ Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2

*a*x

*a*

critical wavelength for TE

_{10}mode is the same as that for TE

_{02}mode

critical wavelength for TE

_{10}mode is one half of that for TE

_{10}mode

critical wavelength for TE

_{10}mode is the same as that for TM

_{10}mode

critical wavelength for TE

_{10}mode is double that for TE

_{01}mode

⇒ A direct radiating cone type loudspeaker attenuates :

medium range frequencies

very low frequencies

high frequencies

very low and high frequencies

⇒ VLF is generally used for

telegraphy

satellite communication

instrument landing system

all of the above

⇒ If each frequency component of

*f*(

*t*) is shifted by p/2, the resulting signal is

Hilbert transform of

*f*(

*t*)

Inverse Hilbert transform of

*f*(

*t*)

Laplace transform of

*f*(

*t*)

Fourier transform of

*f*(

*t*)

⇒ A microwave link uses only line-of-sight propagation.

TRUE

FALSE

⇒

**Assertion (A):** Silicon is less sensitive to changes in temperature than germanium.

**Reason (R):** Cut in voltage in silicon is less than that in germanium.

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

⇒ Surge current rating of an SCR is

the maximum repetitive surge current in which the SCR can withstand

the maximum non-repetitive surge current in which the SCR can withstand

the maximum repetitive or non repetitive surge current in which the SCR can withstand

the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

⇒ A current wave is

*i*= 100

*e*

^{-60t}The initial and final values of current are

100 and 50

100 and 0

0 and 100

100 and 100

⇒ The current source in figure, can be replace

a voltage source of 20 V in series with 5 ohm resistance

a voltage source of 16 V in series with 4 ohm resistance

a voltage source of 20 V in series with 4 Ω resistance

a voltage source of 16 V in series with 5 Ω resistance

⇒ If eddy current damping is to be used, the disc of instrument should be

non-conducting and non-magnetic

conducting and magnetic

conducting and non-magnetic

non-conducting and magnetic

⇒ If the amplitude of the voltage is kept constant, but its frequency is raised to 6 kHz, the new deviation will be for the modulation index is, if

*f*= 500 Hz, Δ

_{m}*f*= 2.25

6 kHz

12 kHz

27 kHz

54 kHz

⇒ Equipotential surfaces about a point charge are in which one of the following forms?

Sphere

Planes

Cylinders

Cubes

⇒ A dynamic RAM cell which holds 5 V has to be refreshed every 20 ms so that the stored voltage does not fall by more than 0.5 V. If the cell has a constant discharge current of 0.1 pA, the storage capacitance of cell is

4 x 10

^{-6}F

4 x 10

^{-9}F

4 x 10

^{-12}F

4 x 10

^{-15}F

⇒ In integral cycle control of ac regulators, the period of integral cycle control,

*i*.

*e*., (

*m*+

*n*) T should be

less than mechanical or thermal time constant of the system

more than the mechanical or thermal time constant of the system

more or less than the mechanical or thermal time constant

very high

⇒ One ampere means the flow of

One coulomb each minute

One electron per second

One coulomb per second

One coulomb each hour

⇒ Electric shock is

always fatal

never fatal

sometimes fatal

always disfiguring

⇒ Which of the following subtraction operations do not result in F

_{16}?

- (BA)
_{16}- (AB)_{161 and 21 and 32 and 31, 2 and 3}

⇒ An ideal voltage source can not be converted into an equivalent current source.

TRUE

FALSE

⇒ An ideal voltage amplifier should have

low input impedance and high output impedance

high input impedance and low output impedance

high input impedance and high output impedance

low input impedance and low output impedance

⇒ In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is

150 A

75 A

50 A

300 A

⇒ The equivalent circuit of an ideal diode is

a charging condenser

a discharging condenser

a switch

a resistor

⇒ Δ^{2}V = - r/E is known as __________ equation

Poisson

Fourier

Laplace

Maxwell

⇒ The units of F(*j*ω) are volt-seconds.

TRUE

FALSE

⇒ Which of the following statement about modulation is correct?

It avoid use of antennas

It reduces bandwidth

It ensures transmission over long distances

It combines different transmissions

⇒ For the system of the given figure, the damping ratio of closed loop pole

1.5

1

0.5

0.25

⇒ Occasionally a discrete amplifier user RF chokes instead of collector resistors. Such amplifiers are inherently

low pass amplifiers

high pass amplifiers

band pass amplifiers

none of the above

⇒ EEPROM is also known as

UVPROM

EAPROM

both UVPROM and EAPROM

none of the above

⇒Match the following:

List I (Component) List II (Dominant TE mode) A. Rectangular wave guide 1. TE _{101}B. Circular waveguide 2. TE _{10}C. Rectangular cavity 3. TE _{111}4. TE _{11}

A-4, B-2, C-1

A-2, B-1, C-3

A-3, B-4, C-1

A-2, B-3, C-1

⇒**Assertion (A):**Gate triggering is the most commonly used method for triggering of an SCR.**Reason (R):**Even a small gate current is sufficient to turn on an SCR.

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

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

A is correct but R is wrong

A is wrong but R is correct