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. | In the circuit of figure the function of resistor R and diode D |

A. | to limit the current and to protect LED against over voltage [Wrong Answer] |

B. | to limit the voltage and to protect LED against over current [Wrong Answer] |

C. | to limit the current and protect LED against reverse breakdown voltage. [Correct Answer] |

D. | none of the above. [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 :**

⇒ Consider the following statements : A clamper circuit

- adds or subtracts a dc voltage to a waveform
- does not change the waveform
- amplifiers the waveform

1, 2

1, 3

1, 2, 3

2, 3

⇒ In an ac coordinate potentiometer, the currents inphase and quadrature potentiometer are adjusted to be

out of phase by 90°

in phase

out of phase by 45°

out of phase 180°

⇒

**Assertion (A):** Hamming code is commonly used for error correction

**Reason (R):** In Hamming code the number of parity bits increases as the number of information bits increases.

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

⇒ The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.

TRUE

FALSE

⇒

**Assertion (A):** 1C 74181 is an ALU in TTL 7400 series.

**Reason (R):** 1C 74181 can accept two 4 bit words and can perform any one of possible 16 arithmetic or logic operations.

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

⇒ The number of branches of root locus plot is equal to

the number of roots of characteristic equation

double the number of roots of characteristic equation

the number of roots of characteristic equation minus one

the number of roots of characteristic equation plus one

⇒ A

*Q*meter uses the principle of

variation of self inductance

variation of mutual inductance

series resonance

none of the above

⇒ In a circuit containing a complex impedance, maximum power transfer takes place when load is

pure resistance

equal to the complex impedance

conjugate complex of the circuit impedance

none of the above

⇒ The maximum permissible distance between two samples of a 2 kHz signal is

1000 μ sec

500 μ sec

250 μ sec

2000 sec

⇒ Voltage V

_{L}in the circuit when V

_{s}< 0 where D is an ideal diode. (Take R

_{1}= R

_{s}= R

_{L}= 1 &o

0

1

1.5

cannot find

⇒ The gain of an FET amplifier can be changed by changing

*r*

_{m}

*g*

_{m}

R

_{d}

none of the above

⇒ While forming Routh's array, the situation of a row of zeros indicates that the system

has symmetrically located roots

is not sensitive to variations in gain

is stable

is unstable

⇒ A buffer amplifier should have

high input impedance and low output impedance

high input impedance and high output impedance

low input impedance and high output impedance

low input impedance and low output impedance

⇒ A microstrip line has dielectric having relative permittivity ∈

*. The effective dielectric constant is*

_{r}more than ∈

_{r}equal to 1

less than ∈

_{r}either

*a*or

*b*

⇒ As regards dielectric constant

*ε*

_{r}the units are farads/m

the units are newton/coulomb

it is dimensionless

the units are farads

⇒ A 12-bit binary counter has the following state. The octal number represente

677

7163

7128

7183

⇒ Consider a 300 Ω, quarter wave long at 1 GHz transmission line as shown in figure. It is connected to a 10 V, 50 Ω source at one end is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line

10 V

5 V

60 V

60/7 volt

⇒ In a PCM the amplitude levels are transmitted in a 7 unit code. The no. of levels is

18

14

128

64

⇒ The equation

*v*(

*t*) = A cos [ω

*+ φ(*

_{c}t*t*)] where A and ω

_{c}are constant and φ(

*t*) is a function of base signal represents

- Phase modulation
- Amplitude modulation
- Angle modulation
- Frequency modulation

3 only

1, 3 and 4

1, 2, 3, 4

3 and 4 only

⇒ Read the following statements about Java

- It is well suited to design software which works in conjunction with internet.
- It is cross platform language.
- Java is close to programming language C, C ++ etc.
- It is an object oriented.

All

1, 2 and 3 only

1, 2 and 4 only

2, 3, 4 only

⇒ 'Rotate instruction' in microprocessor belongs to

data transfer group

arithmetic group

logic group

branch group

⇒ Consider the following strings

- A
- Z2
- X3Y
- P12R
- BX

All

1, 2, 3

1, 2, 4, 5

1, 2, 3, 5

⇒ In a synchronous counter all flip flops are clocked together.

TRUE

FALSE

⇒ A microprocessor can understand instruction written in

machine language only

mnemonics operation codes only

high language only

both machine language and mnemonics operation codes

⇒ How many maximum number of functions can be defined with two symbols which are Boolean in nature:

4

8

2

16

⇒ A network is said to be non-linear if it does not satisfy

homogeneity condition

superposition condition

both (a) and (b)

associative condition

⇒ An RC driving point impedance function has zeros at

*s*= - 2 and

*s*= - 5. The admissible poles are

*s*= 0 and

*s*= -6

*s*= -1 and

*s*= -3

*s*= 0 and

*s*= -1

*s*= -3 and

*s*= -4

⇒ Which of the following devices has two gates?

SCR

SCS

SUS

SBS

⇒ In a CE amplifier

both ac and dc load lines have the same slope

the ac load line has more slope than dc load line

the ac load line has less slope than dc load line

the two load lines may have slope more than the other

⇒ 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°)