Q1. | The use of free wheeling diode in controlled rectifier improves the waveshape of load current. |

A. | TRUE [Correct Answer] |

B. | FALSE [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 :**

⇒ In a Gunn diode oscillator drift velocity of electron is 10

^{7}cm/s and active region length is 10 x 10

^{-4}cm. The natural frequency of oscillation is

1 MHz

10 MHz

1 GHz

10 GHz

⇒ The current wave shown in figure is applied at

*t*= 0 to a 0.1 F capacitor. At

*t*= 1

*s*, the voltage across capacito

0 V

10 V

20 V

40 V

⇒ The dynamic equalising circuit consists of a series combination of capacitor C and resistor R

_{C}across each thyristor. This resistance R

_{C}(along with parallel connected diode)

limits charging current

limits discharging current

limits both charging and discharging currents

none of the above

⇒ The application of magnetic field to superconducting material

increases transition temperature

decreases transition temperature

has no effect on transition temperature

may increase or decrease the transition temperature

⇒

Match the following:

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

A. | Mu Metal | 1. | very high magnetic permeability |

B. | Samrium/cobalt | 2. | very high magnetic remanence |

C. | Sapphire | 3. | very high thermal conductivity |

D. | Ferrites | 4. | very stable magnetic permeability |

A-1, B-2, C-3, D-4

A-3, B-4, C-1, D-2

A-2, B-3, C-4, D-1

A-4, B-1, C-2, D-3

⇒ For H(

*s*) to be positive real, the condition Re[H(

*j*ω)] ≥ 0 for 0 ≤ ω ≤ ∞ is

a necessary condition

a sufficient condition

a necessary and sufficient condition

is not a necessary condition

⇒ Transformer oil is

refined vegetable oil

refined mineral oil

mixture of vegetable and mineral oil

none of the above

⇒ In the network of the figure is the maximum power is delivered to RL if its valu

16 Ω

40/3 Ω

60 Ω

20 Ω

⇒ In voltage amplifiers, the load resistance

should be a small as possible

should be as large as possible

must be equal to output impedance

must be half of output impedance

⇒ A source of angular frequency 1 rad sec has a source impedance consisting of 1 Ω resistance in series with 1 H inductance. The load that will obtained the maximum power transfer is

1 Ω resistance

1 Ω resistance in parallel with 1 H inductance

1 Ω resistance in series with 1 F capacitor

1 Ω resistance in parallel with 1 F capacitor

⇒ The wavelength of light emitted by GaAs laser is 8670 x 10

^{-10}m. If

*h*= 6.626 x 10

^{-34}Js, velocity of light = 3 x 10

^{8}m/s and eV = 1.602 x 10

^{-19}J, the energy gap in GaAs is

0.18 eV

0.7 eV

1.43 eV

2.39 eV

⇒

**Assertion (A):** In C it is possible for functions to call themselves.

**Reason (R):** C makes use of 'Pointers'.

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

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

A is correct R is wrong

A is wrong R is correct

⇒ As the viscosity of a liquid increases, the relaxation time

remains constant

increases

decreases

first decreases then increases

⇒ The equivalent form of the logical expression (ABC + ABC + ABC + ABC + ABC) is:

C + (A ⊕ B)

(A + B + C)(A + B + C)

(A + B + C)(A + B + C)(A + B + C)

(A + B + C)(A + B + C)(A + B + C)

⇒

**Assertion (A):** A half cycle of sine wave can be expressed as sum of sine wave and another sine wave shifted by *T*/2 where T is the time period.

**Reason (R):** The function *u*(*t* - *t*_{0}) - *u*(*t* - *t*_{0} - T) is a gate function occuring at *t* = *t*_{0} and of duration T.

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

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

A is true, R is false

A is false, R is true

⇒ A high resistance was measured by loss of charge method. The voltmeter resistance was 10

^{10}ohms. The calculation gave the value of unknown resistance as 0.8 x 10

^{9}ohms. The true value of resistance is

0.8 x 10

^{9}Ω

less than 0.8 x 10

^{9}Ω

more than 0.8 x 10

^{9}Ω

either (b) or (c)

⇒ In directional coupler of the given figure, the terms |

*S*

_{14}| and |

*S*

_{23}| of scattering matrix are ne

1 each

0.5 each

0.1 each

1 and 0.5 respectively

⇒ Many compounds also exhibit semiconducting properties.

TRUE

FALSE

⇒ 1101

_{2}- 1001

_{2}=

1000

100

10

1

⇒ The hexadecimal number 'A0' has the decimal value

80

256

100

160

⇒

**Assertion (A):** The Fourier series of the wave shown in the figure does not contain even harmao

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

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

A is true, R is false

A is false, R is true

⇒ A pulse transformer uses

ferrite core

air core

iron core

copper core

⇒ A TRIAC can be turned on :

by applying a positive signal to gate

by applying a negative signal to gate

by applying either positive or negative signal to gate

none of the above

⇒ In a bipolar transistor, the base collector junction has

forward bias

reverse bias

zero bias

zero or forward bias

⇒ An OR gate has 4 inputs. One input is high and the other three are low. The output

is low

is high

is alternately high and low

may be high or low depending on relative magnitude of inputs

⇒ Quartz crystal has

very small Q

small Q

very high Q

Q less than 1

⇒ An input voltage V(*t*) = 10 2 cos (*t* + 10°) + 10 3 cos (2*t* + 10°)*V* is applied to a series combination of resistance R = 1 kΩ inductance L = 1H. The resulting steady-state current *i*(*t*) in ampere is

10 cos (*t* + 55°) + 10 cos (2*t* + 10° tan^{-1}2)

10 cos (*t* + 55°) + 103/2 cos (2*t* + 55°)

10 cos (*t* - 35) + 10 cos (2*t* + 10° - tan^{-1}2)

10 cos (*t* - 35) + 103/2 cos (2*t* + 35°)

⇒ The ASCII code is

5-bit code

7-bit code

9-bit code

11-bit code

⇒ Binary multiplication can be done by repeated addition.

TRUE

FALSE

⇒

**Assertion (A):** In a power divider S_{H} = 0, S_{21} = 0.707 = S_{3},

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

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

A is correct but R is wrong

A is wrong but R is correct