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. | Which of the following are voltage controlled devices? |

A. | Vacum triode [Wrong Answer] |

B. | FET [Wrong Answer] |

C. | SCR [Wrong Answer] |

D. | Both (a) and (b) [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 :**

⇒ A moving iron instrument can be used for

dc only

ac only

both dc and ac

dc and high frequency ac

⇒ The radar cross-section of a target depends an

frequency

polarization of incident wave

aspect of target

all of the above

⇒ Which of the following can not be used as a variable name in C?

else

coal

ram

vendy

⇒ In a full wave rectifier circuit using centre tapped transformer, the peak voltage across half the secondary winding is 40 V. If diodes are ideal, the average output voltage is

40 V

25.5 V

20 V

2.55 V

⇒ In intrinsic semiconductor the increase in conductivity per degree increase in temperature is about

0.02

0.06

0.15

0.25

⇒ 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)⇒ In fi

Wave A is lagging wave B by ∠θ

Wave A is leading wave B by ∠θ

Wave A is lagging wave B by ∠θ and the two waves have same rms values

Wave A is lagging wave B by ∠θ and the two waves have different rms values

⇒ Fourier transform and F(

*j*ω) of a signal

*f*(

*t*) has the property

F(

*j*ω) = F(-

*j*ω)

F(

*j*ω) = -F(-

*j*ω)

F(

*j*ω) = F

^{*}(

*j*ω)

F(

*j*ω) = -F

^{*}(-

*j*ω)

⇒ The efficiency of a chopper circuit is about

80% or more

around 50%

around 20%

around 5%

⇒ A 0.5 μF capacitor is connected across a 10 V battery. After a long time, the circuit current and voltage across capacitor will be

0.5 A and 0 V

0 A and 10 V

20 A and 5 V

0.05 A and 5 V

⇒ In the circuit of fi

V

_{a}would always lag V

_{b}

V

_{a}would always lead V

_{b}

V

_{a}and V

_{b}would always be in phase

V

_{a}may lag or lead V

_{b}

⇒ The dynamic characteristics of capacitive transducer are similar to those of

LP filter

HP filter

notch filter

band stop filter

⇒ For most static RAM the maximum access time is about

1

*ns*

10

*ns*

100

*ns*

1 μ

*s*

⇒ Which device changes parallel data to serial data?

Decoder

Multiplexer

Demultiplexer

Flip flop

⇒ In a synchro transmitter-control transformer, the voltage induced in rotor winding of control transformer is zero when the angular displacement between rotors of transmitter and transformer is

0°

90°

180°

either (a) or (c)

⇒ The function in the given figure can be writte

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4) -

*u*(

*t*- 6) sin p (

*t*- 6)

*u*(

*t*- 1) sin p (

*t*- 1) -

*u*(

*t*- 3) sin p (

*t*- 3) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin p (

*t*- 1) +

*u*(

*t*- 4) sin p (

*t*- 4)

*u*(

*t*- 1) sin 2p (

*t*- 1) +

*u*(

*t*- 4) sin 2p (

*t*- 4)

⇒ A dynamometer wattmeter is suitable for both dc and ac.

TRUE

FALSE

⇒ The first row of the window is called ' Title bar '.

TRUE

FALSE

⇒

Match the following:

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

A. | Serial Binary adder | 1. | (2n - 1)t_{pd} |

B. | Ripple carry adder | 2. | (n - 1)t_{pd} |

C. | Carry look ahead binary adder | 3. | Operation time independent of size |

4. | 6t for 4 bit carry look ahead adder_{pd} |

A-2, B-1, C-3

A-2, B-1, C-4

A-1, B-2, C-4

A-1, B-2, C-3

⇒ The equivalent of the block diagram in figure is give

Figure (a)

Figure (b)

Figure (c)

Figure (d)

⇒ Double integration of a unit step function would lead to

an impulse

a parabola

a ramp

a doublet

⇒ In full wave rectification, if the input frequency is 50 Hz, then frequency at the output of filter is

50 Hz

0 Hz

100 Hz

75 Hz

⇒ For a core having a relative permeability μ

_{r}, magnetic dipole moment per unit volume M and field strength H, the flux density B is

B = μ

_{r}(H + M)

B = μ

_{0}(H + M)

B = μ

_{0}μ

_{r}(H + M)

B = μ

_{0}μ

_{r}(H - M)

⇒ The direction in a Yagi Uda antenna

is longer than the radiating element

is shorter than the radiating element

can be longer or shorter than the radiating element

does not exist

⇒ When a JFET is cut off, it's like an __________ switch and when it is saturated, it's like a __________ switch.

closed, open

open, closed

open, open

closed, closed

⇒ The advantage of FET over BJT is

high input impedance

lower noise

no thermal runaway

all of the above

⇒ A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is

20 mH

about 31 mH

about 51 mH

about 92 mH

⇒ In the 2's complement Adder-Subtractor

sign magnitude numbers represent negative numbers

the sign magnitude numbers have "1" as leading bit

the sign magnitude numbers have '0' as leading bit

2's complement represents positive numbers

⇒ The realization of the term Ks yields

a resistance of value K ohms

a capacitances of value K farads

an inductance of value k farads

either (b) or (c)

⇒ The function of shunt in an ammeter is to

by pass the current

increase sensitivity of meter

increase resistance of meter

all of the above