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Q1. | The potential that appears at a point in space due to the current which caused it is called potential |

A. | accelerating [Wrong Answer] |

B. | retardation [Correct Answer] |

C. | oscillating [Wrong Answer] |

D. | lagging the current [Wrong Answer] |

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

⇒ When two coupled coils of equal self inductance are cormected in series in one way the net inductance is 12 mH and when they are connected in the other way the net inductance is 4 mH. The maximum value of inductance when they are connected in parallel is

2 mH

3 mH

4 mH

6 mH

⇒ Which of the following computer memories is fastest?

Cache

Primary

Mass storage

Off line back up

⇒ A silicon (PN) junction at a temperature of 20°C has a reverse saturation current of 10 pico Ampere. The reverse saturation current at 40°C for the same bias is approximately.

30 pA

40 pA

50 pA

60 pA

⇒ Trap circuits used in video IF amplifier of colour TV are

High Q, LC resonant circuit

Low Q, LC resonant circuit

High Q, RLC resonant circuit

Low Q, RLC resonant circuit

⇒ Which of the following conditions must be satisfied for a transistor to remain under saturation?

- Its collector to base junction should be under forward bias.
- Its collector to base junction should be under reverse bias.
- Its emitter to base junction should be under reverse bias.
- Its emitter to base junction should be under forward bias.

1 and 2

1 and 3

2 and 3

1 and 4

⇒ Consider the common emitter amplifier shown below with the following circuit parameters: β = 100,

*g*= 0.3861 A/V,

_{m}*r*

_{0}= ∞

*r*= 259 Ω, R

_{p}_{s}= 1 kΩ, R

_{B}= 93 kΩ, R

_{C}= 250 Ω, R

_{L}= 1 kW, C

_{1}= ∞ and C

_{2}= 4.

33.9 Hz

27.1 Hz

13.6 Hz

16.9 Hz

⇒ A voltage wave

*v*= 10 + 20 sin ω

*t*+ 7.5 sin 3 ω(

*t*) is applied to a series combination of two elements. The current is

*i*= 5 sin (ω

*t*+ 20°) + 1.5 sin (3ω

*t*+ 10°). The elements are

R and C

R and L

L and C

both inductances

⇒

**Assertion (A):** In a series resonant circuit current is maximum at resonance.

**Reason (R):** The inductive and capacitive reactances are equal.

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

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

A is true but R is false

A is false but R is true

⇒ A transmission line has a characteristic impedance of 50 Ω and a resistance of 0.1 Ω/m, if the line is distortion less, the attenuation constant (in Np/m) is

500

5

0.014

0.002

⇒ Which of the following equations satisfy Maxwell's equations?

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

E

_{x}= E

_{y}= 0, E

_{z}= cos (

*y*-

*ct*)

F

_{y}= cos (

*y*-

*ct*), E

_{x}= E

_{z}= 0

None of these

⇒ The density of dynamic RAM is

the same as static RAM

less than that of static RAM

more than that of static RAM

either equal or less than that of static RAM

⇒ For a second order system ω

_{n}is natural frequency, ω

*is frequency of damped oscillations and ζ is damping factor. Then*

_{d}ω

_{d}= ω

_{n}ξ

ω

_{d}= ω

_{n}(1 - ξ)

^{2}

ω

_{d}= ω

_{n}(1 - ξ)

^{0.5}

ω

_{d}= ω

_{n}(1 - ξ

^{2})

^{0.5}

⇒ Gain of an antenna with a circular aperture of diameter 4 meter at frequency of 10 GHz, with directivity 60

60

100

30

90

⇒ Consider the following network func

zero at origin

zero at infinity

pole at origin

pole at infinity

⇒ Which type of gate is in the given fig

NOR

OR

NAND

EX-OR

⇒ 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

⇒ The scale of PMMC instrument is linear.

TRUE

FALSE

⇒

Match the following:

List I (Double Rectifier) | List II (Number of Diodes) | ||
---|---|---|---|

A. | Full wave Bridge rectifier | 1. | 1 |

B. | Half wave rectifier | 2. | 2 |

C. | Full wave rectifier using centre tapped transformer | 3. | 4 |

A-1, B-2, C-3

A-3, B-1, C-2

A-2, B-1, C-3

A-3, B-1, C-2

⇒ The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by

RL network only

RC network only

LC network only

RC as well as RL network

⇒ The reverse breakdown voltage of a diode depends on the extent of doping.

TRUE

FALSE

⇒ A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are

10 Ω, 8 Ω

15 Ω, 8 Ω

20 Ω, 10 Ω

30 Ω, 15 Ω

⇒ Each frequency in the modulating wave gives rise to four side bands.

TRUE

FALSE

⇒ K maps can be drawn

only for 2 variables

only for 3 variables

only for 4 variables

for any number of variables

⇒ Which of the following is not correct?

P(A) = P(A) - 1

0 ≤ P ≤ 1

If A and B are mitual exclusive then P(A + B) = P(A) + P(B)

P(A) = 1 - P(A)

⇒ Divergence of curl A is

∇ . (∇ x A) = 1

∇ . (∇ x A) = 0

∇ . (∇ x A) = ∇

∇ . (∇ x A) = - ∞

⇒ A Schottky diode has

no minority carriers and very low voltage drop in forward direction

no minority carriers and very high voltage drop in forward direction

large number of minority carriers and very high voltage drop in forward direction

large number of minority carriers and very low voltage drop in forward direction

⇒ V

_{R}at

*t*< T,

*t*= &in

500

*e*

^{-40x104t}, 0

100

*e*

^{-40x103t}, 0

100

*e*

^{-40x106t}, 0

100

*e*

^{-40x104t}, 0

⇒ If

*k*denotes Boltzmann's constant, the rms value of thermal noise voltage is proportional to

*k*

^{2}

*k*

*k*

(

*k*)

^{1/3}

⇒

**Assertion (A):** Intrinsic semiconductor is an insulator at 0 K.

**Reason (R):** Fermi level in intrinsic semiconductor is in the centre of forbidden energy band.

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

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

A is true but R is false

A is false but R is true

⇒ If operator '

*a*' = 1 ∠120° then (1 +

*a*

^{2}) =

3

3 ∠30°

3 ∠ - 30°

3 ∠60°