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Q1. | The resistance of a metallic wire would |

A. | increase as f increase [Correct Answer] |

B. | decrease as f increase [Wrong Answer] |

C. | remains the same at all frequencies [Wrong Answer] |

D. | increase with f up to a certain frequency and then decrease [Wrong Answer] |

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

⇒

Match the following:

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

A. | DMA controller | 1. | Interface between computer and video display adapter |

B. | CKT controller | 2. | Used to read data directly from disk into directly memory |

C. | Interrupt controller | 3. | Supervises the operation of control signal |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-2, C-1

A-2, B-1, C-3

⇒ In the op-amp circuit of figure, V

_{010 V-10 V5 V-5 V}

⇒ For a reactance function H(

*s*)

Re [H(

*j*ω)] is positive for ω ≥ 0

Re [H(

*j*ω)] is zero for ω ≥ 0

Re [H(

*j*ω)] is positive or zero for ω ≥ 0

Re [H(

*j*ω)] is zero or negative for ω ≥ 0

⇒ Four capacitors are in parallel. Their values are 36.3 μF, 3.85 μF, 34.002 μF and 850 μF with an uncertainty of digit in the last place. The total capacitance in significant figures is

75.0 μF

75.0 ± 0.1 μF

75.1 ± 0.1 μF

75.002 ± 0.1 μF

⇒ If the open-loop transfer function is a ratio of a numerator polynomial of degree '

*m*' and a denominator polynomial of degree '

*n*', then the integer (

*n*-

*m*) represents the number of:

breakaway points

unstable poles

separate root loci

asymptotes

⇒ A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires

8 half adders and 4 OR gates

8 half adders and 3 OR gates

7 half adders and 3 OR gates

7 half adders and 4 OR gates

⇒ Periodic recharging of the memory cells at regular intervals of 3 to 8 millisecond is required in a

ROM

Static RAM

Dynamic RAM

PLA

⇒ If a function

*f*(

*t*) is an odd, function, its Fourier series

contains only sine terms

contains only cosine terms

contains a constant and sine terms

contains a constant and cosine

⇒ Wheatstone bridge is suitable for low resistances.

TRUE

FALSE

⇒ Which of the following is not a valid real constant in C?

426

321

-621.231

201.2314

⇒ The characteristic impedance of a twin wire feeder used for TV signals is about

1000 ohm

500 ohm

300 ohm

100 ohm

⇒ The coil of a DArsonval galvanometer has N turns. If flux density is B, current is I and area of coil is A, the deflecting torque is

NBI/A

NBIA

NIA/B

N

^{2}IAB

⇒ 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

⇒ Earth's curvature affects the effective height of antenna.

TRUE

FALSE

⇒ An RC series circuit is charged by a voltage E. After a long time the battery is removed and a short circuit is placed across R-C. Then

the polarity of voltage across R is same during discharge and during charge

the polarity of voltage across R during discharging is opposite to that during charging

the polarity of voltage across R depends on time constant RC

none of the above

⇒ The race condition in NOR SR latch occurs when

S = R = 1

S = 0, R = 1

S = 0, R = 0

S = 1, R = 0

⇒ A P-channel MOSFET operating in the enhancement mode is characterized by V

_{t}= - 4 V and I

_{DQ}= - 10 mA, when V

_{GSQ}= - 5.5 V, what will be V

_{GSQ}if I

_{DQ}= -15 mA and I

_{D, on}= - 16 mA

- 2 V

3 V

0.13 V

1.3 V

⇒ A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at

*s*= - 2 and

*s*= - 4, and one simple zero at

*s*= - 1. A unit step

*u*(

*t*) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

[exp (- 2

*t*) + exp (-4

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*) - exp (-

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*)]

*u*(

*t*)

[-0.5 exp (- 2

*t*) + 1.5 exp (-4

*t*)]

*u*(

*t*)

⇒ When all the seven segments of a display are energized, the number shown is

0

1

7

8

⇒ Two coils X and Y have self inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is

0.3 V

0.5 V

1 V

1.5 V

⇒ In a CE amplifier the ac cut off voltage is 9 V and slope of ac load line is - 0.5 mA/V. The ac saturation current is

9 mA

4.5 mA

3 mA

18 mA

⇒ The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly

0.9

0.8

0.75

0.7

⇒ Amplification of ultrasonic waves is possible in a piezoelectric semiconductor under applied electric field. The basic phenomenon involved is known as

electrostriction

acousto-optic interaction

acousto-electric interaction

stimulated Brillouin scattering

⇒ Figure shows the feedback network of one of the very popular types of sinusoidal oscillators. Which one is t

Weinbridge oscillator

Hartley oscillator

Colpitt's oscillator

R-C phase shift oscillator

⇒ Which of the following circuits can operate class AB for audio power output?

Emitter follower

Push pull

Cascade

Darlington pair

⇒ Frequency shift keying is used mostly in

telephony

telegraphy

radio transmission

none of the above

⇒ Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 Ω resistor in the network shown in the above fig

Thevenin's theorem

Maximum power transfer theorem

Millman's theorem

Superposition theorem

⇒ A basic group B

consists of five super groups

has a frequency range of 60 to 108 kHz

consists of erect channels only

is formed at group translating equipment

⇒ In the circuit of figure both diodes are ideal. If

*v*

_{1}= 10 V and

*v*

_{2}= 10 V which diode will cond

D

_{1}only

D

_{2}only

Both D

_{1}and D

_{2}

Neither D

_{1}nor D

_{2}

⇒ If a EM wave propagating in z direction then

component of EM wave will exist in

*z*direction

component of EM wave will not exist in

*z*direction

component of EM wave will exist in

*y*direction

component of EM wave will exist in

*x*direction