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 statement is correct? |

A. | BJT and MOSFET are current controlled devices [Wrong Answer] |

B. | BJT is voltage controlled and MOSFET is current controlled device [Wrong Answer] |

C. | BJT and MOSFET are voltage controlled devices [Wrong Answer] |

D. | BJT is current controlled and MOSFET is voltage controlled device [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 :**

⇒ For representing two sinusoidal voltages on a phasor diagram

Both voltages must be of the same frequency

Both voltages must be sinusoidal but may be of different frequencies

One of the voltages must be of 50 Hz

The frequency of one must be integral of that of other

⇒ A full wave rectifier circuit using centre tapped transformer, the input frequency 50 Hz. The frequency of output is

100 Hz

50 Hz

25 Hz

none of the above

⇒ The diameter and thickness of CD are

6 cm and 1.2 mm

6 cm and 0.6 mm

12 cm and 0.6 mm

12 cm and 1.2 mm

⇒ If we need a device to shut off a few ampere current in a few nano seconds, the proper devices is

VMOS

CMOS

BJT

UJT

⇒ Which rectifier has the best ratio of rectification?

Half wave rectifier

Full wave rectifier

Bridge rectifier

Three phase full wave rectifier

⇒ Regarding TASI which one of the following statements is wrong?

It snatches the channel in his speech and may allocate it to another speaker needing it.

The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded.

It increases the overall utilization of the transmission channel

Intercontinental callers sometimes confuse the effects of TASI with the effects of satellite delay.

⇒ The magnitude plot of a composite signal

*x(t)*=

*e*

^{3jt}+

*e*

^{4jt}is __________ .

Half wave rectified sinusoid

Full wave rectified sinusoid

Exponentially increasing sinusoid

Exponentially decreasing sinusoid

⇒ The inputs to a 3 bit binary adder are 111

_{2}and 110

_{2}. The output will be

101

1101

1111

1110

⇒ An XOR gate with 6 variables is as follows A ⊕ B ⊕ C ⊕ D ⊕ E ⊕ F. The number of minterms in the Boolean expression is

6

12

64

32

⇒ The output

*y*(

*t*) of a linear time invariant system is related to its input

*x*(

*t*) by the following equation

*y*(

*t*) = 0.5

*x*(

*t*-

*t*

*+ 1) +*

_{d}*x*(

*t*-

*t*

*) + 0.5*

_{d}*x*(

*t*-

*t*

*+ 7). The filter transfer function*

_{d}*H*(ω) of such a system is given by

(1 + cos ωt)

*e*

^{-jωt}

*d*

(1 + 0.5 cos ωt)

*e*

^{-jωt}

*d*

(1 + cos ωt)

*e*

^{jωt}

*d*

(1 - 0.5 cos ωt)

*e*

^{-jωt}

*d*

⇒ The total number of leads in MOS controlled thyristor is

2

3

4

2 or 3

⇒ Let JCOKE = 20 and LPEPSI =15. Consider the statement

23

15

17

⇒ Which of the following is used to generate PDM?

Free running multi-vibrator

Monostable multi-vibrator

JK flip-flop

Schmitt trigger

⇒

**Assertion (A):** In a parallel circuit with three branches having R, L and C respectively and fed by a step current I, the current through inductance is always zero.

**Reason (R):** The time constant of R-L circuit is L/R.

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

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

⇒ A current 10 sin (200

*t*) A flows through a 5 mH inductance. The expression for voltage is

10 sin (200

*t*+ 90°)

10 sin (200

*t*- 90°)

10 sin(1000

*t*+ 90°)

10 sin (1000

*t*- 90°)

⇒ To protect an SCR against high

*di*/

*dt*we connect

a capacitance in series with SCR

a capacitance in parallel with SCR

an inductance in parallel with SCR

an inductance in series with SCR

⇒ Microprocessor 8088 has

16 bit registers and 16 bit data bus

8 bit registers and 8 bit data bus

8 bit registers and 16 bit data bus

16 bit registers and 8 bit data bus

⇒ A 4 bit DAC gives an output of 4.5 V for input of 1001. If input is 0110, the output is

1.5 V

2.0 V

3.0 V

4.5 V

⇒ The analog signal given below is sampled by 600 samples per second for

*m*(

*t*) = 3 sin 500 p

*t*+ 2 sin 700 p

*t*then folding frequency is

500 Hz

700 Hz

300 Hz

1400 Hz

⇒ The output impedance of an ideal op-amp is

zero

low

high

infinite

⇒ Full duplex operation-permits transmission in both directions at the same time.

TRUE

FALSE

⇒ An increase in ambient temperature means that maximum power rating of transistor

will increase

will decrease

may increase or decrease

may increase or remain the same

⇒ For a NPN bipolar transistor, what is the main stream of current in the base region?

Drift of holes

Diffusion of holes

Drift of electrons

Diffusion of electrons

⇒ Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

TRUE

FALSE

⇒ In a superheterodyne receiver

the IF stage has better selectivity than RF stage

the RF stage has better selectivity than IF stage

the RF stage has same selectivity than IF stage

none of the above

⇒ In amplitude modulation

the amplitude of carrier varies in accordance with the amplitude of the modulating signal.

the modulating frequency lies in the audio range

the amplitude of the carrier remains constant

the amplitude of the carrier varies in accordance with the frequency of the modulating signal.

⇒ In CCD

a small charge is deposited for logical 1

a small charge is deposited for both logical 1 and 0

a small charge is deposited for logical 0 and large charge for logical 1

none of the above

⇒ Forbidden energy gap in germanium at 0 K is about

10 eV

5 eV

2 eV

0.78 eV

⇒ Electric dipole moment is expressed in debye unit.

TRUE

FALSE

⇒ Indium, aluminium, arsenic are all

*p*type impurities.

TRUE

FALSE