Users Also Read

MCQ's Search Engine

Electrical Engineering

Mechanical Engineering

Civil Engineering

Automobile Engineering

Chemical Engineering

Computer Engineering

Electronics Engineering

Medical Science Engg

Q1. | A thyristor is reverse biased. A positive gate pulse is applied. The thyristor |

A. | will be turned on [Wrong Answer] |

B. | may or may not turn on [Wrong Answer] |

C. | will not turn on [Correct Answer] |

D. | will turn on after sometime [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss 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 :**

⇒ The seven bit Hamming code received is 0010001. If even parity has been used, the correct code is

10001

1110001

110001

11001

⇒ The constellation diagram of a modem has four states as shown in the figure given below. What is the bit rate of this mod

Two times its band rate

Four times its band rate

Same as band rate

Sufficient information is not given to give the answer

⇒

Match the following:

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

A. | Continuous and aperiodic | 1. | Fourier representation is continuous and aperiodic |

B. | Continuous and Periodic | 2. | Fourier representation is discrete and aperiodic |

C. | Discrete and aperiodic | 3. | Fourier representation is continuous and periodic |

D. | Discrete and periodic | 4. | Fourier representation is discrete and periodic |

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

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

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

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

⇒ Average latency time of magnetic tape memory is of the order of

1 μ sec

1 msec

1 sec

1 minute

⇒

**Assertion (A):** Inverters and choppers use fast switching thyristors

**Reason (R):** Fast switching SCR has low turn off time.

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

⇒ In a TV receiver the video IF amplifier provides a gain of about

5 dB

20 dB

60 dB

200 dB

⇒ Which of these commutation methods uses an auxiliary SCR?

Class A

Class B

Class C

Class D

⇒ In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about

0.1

1.25

5

10

⇒ Almost all resistors are made in a monolithic integrated circuit

during the entire diffusion

while growing the epitaxial layer

during the base diffusion

during the collector diffusion

⇒ CMOS is widely used in

digital wrist watches

analog circuits

high power circuits

all of the above

⇒ Consider the following statements about constants in 8085

- The assembler treats 64 H as hexadecimal constant.
- The assembler treats 154 as binary constant.
- The assembler treats 540 as octal constant.
- The assembler treats 138 as decimal constant.

1, 2 and 3 only

1, 3 and 4 only

1 and 3 only

2 and 4 only

⇒ Multiphase choppers are used in

low power circuits

high power circuit

both low and high power circuits

medium power circuits

⇒ The character set of Fortran 77 includes lower case alphabets a to z.

TRUE

FALSE

⇒ Which binary addition is incorrect?

1001.1 + 1011.01 = 10100.11

100010 + 1000101 = 1001010

0.0011 + 0.1110 = 1.1

1011.01 + 1001.11 = 10111

⇒

**Assertion (A):** The hybrid p model of a transistor can be reduced to *h* parameter model and vice versa.

**Reason (R):** Hybrid p and *h* parameter models are interrelated as both of them describe the same device.

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

⇒ Consider two random processes

*x(t)*and

*y(t)*have zero mean, and they are individually stationary. The random process is

*z(t)*=

*x(t)*+

*y(t)*. Now when stationary processes are uncorrelated then power spectral density of

*z(t)*is given by

S

*+ S*

_{x}(f)*+ 2S*

_{y}(f)

_{xy}(f)S

*+ S*

_{x}(f)*+ 2S*

_{y}(f)*+ 2S*

_{xy}(f)

_{yx}(f)S

*+ S*

_{x}(f)

_{y}(f)S

*+ S*

_{x}(f)*- 2S*

_{y}(f)*- 2S*

_{xy}(f)

_{yx}(f)⇒ FET can used in

buffer amplifier circuits

cascade amplifier circuits

digital circuits

all of the above

⇒ The amplitude modulated wave is given by __________

*e*= 25(1 + 0.7 cos 5000

*t*- 0.3 cos 1000

*t*) x sin 5 x 10

^{6}

*t*The amplitude of carrier and sideband frequencies in magnitudes are

25, 0.7, 0.3

25, 0.7, - 0.3

24, 17.5, 7.5

25, 8.75, 3.75

⇒ If a signal

*f*(

*t*/2) has energy is E/

*n*then energy of the signal

*f(nt)*is equal to __________ (

*n*is constant)

E/2

*n*

^{2}

2E/

*n*

^{2}

E/

*n*

^{2}

2E

*n*

^{2}

⇒ A cordless telephone using separate frequencies for transmission in base and portable units is known as

duplex arrangement

half duplex arrangement

either (a) or (b)

neither (a) nor (b)

⇒ Find current flowing through 1 H inductor at

*t*= 0, at which switch 'S' is ope

0

2

3

5

⇒ Noise can be measured by

D.C. voltmeter

A.C. voltmeter

either of the above

none of the above

⇒ In a practical voltage source, the terminal voltage

cannot be less than source voltage

cannot be higher than source voltage

is always less than source voltage

is always equal to source voltage

⇒ In a circuit using a full wave converter (M - 2 connection) the PIV of each thyristor is 400 V. For the same output voltage and fully controlled bridge converter, PIV will be

400 V

800 V

200 V

2002 V

⇒ The pole of a reactive function

lie on

*j*ω axis only

lie on negative real axis only

may lie anywhere on

*s*plane

lie on

*j*ω axis or on negative real axis

⇒ The binary addition 1 + 1 =

11

10

111

100

⇒ The sensitivity of a superheterodyne receiver is determined by

the gain IF amplifier

the gain of RF amplifier

the noise figure

all of the above

⇒ The polar plot of G(

*j*ω) = 1/

*j*ω is

positive imaginary axis

positive real axis

negative imaginary axis

negative real axis

⇒ Which memory is available in all technologies?

PROM

EEPROM

ROM

EPROM

⇒ A λ/8 section of transmission line is determined of load impedance of (2 -

*j*5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

10 Ω

(6.9 +

*j*7.24) Ω

(1.75 +

*j*3.098) Ω

(2 -

*j*5) Ω