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Q1. | If the diameter of a wire is doubled, its current carrying capacity becomes |

A. | one-fourth [Wrong Answer] |

B. | half [Wrong Answer] |

C. | twice [Wrong Answer] |

D. | four times [Correct Answer] |

View Answer
Explanation:-
Answer : DDiscuss 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 :**

⇒ In a klystron amplifier the transit time of electron passing the gap in the cavity should be

less than one cycle

less than half cycle

less than quarter cycle

more than quarter cycle

⇒ An homogeneous dielectric material is subjected to an electric field E. If a small cavity is made inside the material, the electric field intensity inside and outside the cavity are different.

TRUE

FALSE

⇒ The Hilbert transform of cos ω

_{1}

*t*+ sin ω

_{2}

*t*is

sin ω

_{1}

*t*+ cos ω

_{2}

*t*

sin ω

_{1}

*t*- cos ω

_{2}

*t*

cos ω

_{1}

*t*- cos ω

_{2}

*t*

sin ω

_{1}

*t*+ sin ω

_{2}

*t*

⇒ In the given figure forward voltage wave has a magni

90 V

60 V

30 V

10 V

⇒ Which of the following is the disadvantage of PDM and PPM?

It requires pulses of larger widths

More samples are needed per second

More powerful transmitter is required

None of the above

⇒ In which region of a CE bipolar transistor is collector current almost constant?

Saturation region

Active region

Breakdown region

Both saturation and active region

⇒ Rochelle salt is a ferroelectric material.

TRUE

FALSE

⇒ The chip 8254 is a 40 pin programmable interval timer. The number of its independent 16 bit counters is

2

3

4

5

⇒ A fully controlled bridge converter feeds a highly inductive load such that the load current can be assumed to be constant. The wave shape of input current is

dc

sinusoidal

rectangular

none of the above

⇒ If Z is the number of zeros of 1 + G(

*s*) H(

*s*) in the right half

*s*plane. N is the number of clockwise encircle elements of (-1 +

*jo*) point. P is the number of poles of G(

*s*) H(

*s*) in right half

*s*plane. The Nyquist stability criterion can be expressed as

Z = N + P

Z = P/N

Z = N - P

Z = PN

⇒ The dual of a link is

twig

node

loop

tree branch

⇒ Twelve resistance each 2 ohm are connected to form a cube, one resistance being in each arm of cube. The resistance between any two diagonally opposite comers is

1 Ω

2 Ω

4 Ω

8 Ω

⇒

**Assertion (A):** If the reading of an instrument is low, the error is large.

**Reason (R):** The error of an instrument is certain percentage of its full scale deflection.

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 R is false

A is false R is true

⇒ A 300 V voltmeter has an accuracy of ± 2% of full scale deflection. When the reading is 222 V, the actual voltage

lies between 217.56 and 226.44 V

lies between 217.4 and 226.6 V

lies between 216 and 228 V

is exact 222 V

⇒ T-flip-flop is commonly used as

a delay switch

a digital counter only

a digital counter and frequency divider

any of the above

⇒ If memory chip size is 256 x 1 bits, the number of chips required to make 1 k byte memory is

8

12

24

32

⇒ A blank EPROM has

all bits set to logical 0

all bits set to logical 1

half the total number of bits set to 0 and remaining half to logical 1

either (a) or (b)

⇒ The orientation polarization is

- directly proportional to temperature
- inversely proportional to temperature
- inversely proportional to square of permanent dipole moment
- directly proportional to square of permanent dipole moment.

1 and 3 only

2 and 3 only

1 and 4 only

2 and 4 only

⇒ Modified Mc Murray full bridge inverter uses

4 thyristors and 2 diodes

4 thyristors and 4 diodes

8 thyristors and 4 diodes

8 thyristors and 8 diodes

⇒ Phase velocity of waves propagating in a hollow metal waveguide is

greater than the group velocity

less than the velocity of light in free space

equal to the velocity of light in free space

equal to group velocity

⇒ The number of digit 1 present in the binary representation of 3 x 512 + 7 x 64 + 5 x 8 + 3 is

8

9

10

12

⇒ In photoelectric emission the maximum kinetic energy of emitted electron is proportional to

*f*

*f*

*f*

^{2}

*f*

^{3}

⇒ Which of the following is a false statement about Armstrong modulation system?

The system is basically phase, not frequency, modulation

AFC is not needed, as a crystal oscillator is used

Equalization is unnecessary

Frequency multiplication must be used

⇒ Companding is used in PCM to

reduce bandwidth

increasing S/N ratio

get almost uniform S/N ratio

increase bandwidth

⇒ Which of these has lowest dielectric strength?

Dry air

Wet air

Cotton

Paper

⇒ A single phase dual converter consists of

two fully controlled converters connected in parallel

two fully controlled converters connected in antiparallel

two fully controlled semiconverters connected in antiparallel

two fully controlled semiconverters connected in parallel

⇒ The Fourier series of a real periodic function has only

- Cosine terms if it is even
- Sine terms if it is even
- Cosine terms if it is odd
- Sine terms if it is odd

(1) and (4)

(1) and (2)

(2) and (4)

(2) and (3)

⇒ P flag is for parity.

TRUE

FALSE

⇒ A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?

0.1

0.25

0.5

0.75

⇒ Transient current in a loss free LC circuit when excited from an ac source is an __________ sine wave.

undamped

over damped

under damped

critically damped