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Q1. | In an n-p-n transistor biased for operation in forward active region |

A. | emitter is positive with respect to base [Wrong Answer] |

B. | collector is positive with respect to base [Wrong Answer] |

C. | base is positive with respect to emitter and collector is positive with respect to base [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 :**

⇒ A delta modulation system is designed to operate at 3 times the Nyquist rate for a signal with a 3 KHz bandwidth. The quantization step size is 250 mv. The maximum amplitude of a 1 KHz input sinusoidal for which the delta modulator does not show slope overload is :

716.2 mV

500 mV

647.87 mV

400 mV

⇒ As compared to MOS memories, bipolar memories have

slower access time but are cheaper

slower access time and are costly

faster access time and are cheaper

faster access time and are costly

⇒ A class B chopper operates in third quadrant.

TRUE

FALSE

⇒ For the amplifier circuit of figure, the

*h*parameters of transistor are

*h*

_{ib}= 25 Ω,

*h*

_{fb}= 0.999,

*h*

_{ob}= 10

^{-6}Ω. The voltage gai

0.999

1.98

20

400

⇒ In a JK flip flop output Q

*= 1 and it does not change when clock pulse is applied. The possible combination of J*

_{n}*and K*

_{n}_{n}is (X denotes don't care)

X and 0

X and 1

0 and X

1 and X

⇒ The orientation polarization of a polyatomic gas is inversely proportional to absolute temperature.

TRUE

FALSE

⇒ A linear time-invariant, causal continuous time system has a rational transfer function with simple poles at

*s*= - 2 and

*s*= - 4, and one simple zero at

*s*= - 1. A unit step

*u*(

*t*) is applied at the input of the system. At steady state, the output has constant value of 1. The impulse response of this system is

[exp (- 2

*t*) + exp (-4

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*) - exp (-

*t*)]

*u*(

*t*)

[-4 exp (- 2

*t*) + 12 exp (-4

*t*)]

*u*(

*t*)

[-0.5 exp (- 2

*t*) + 1.5 exp (-4

*t*)]

*u*(

*t*)

⇒ Two wires A and B have the same cross-section area and are made of the same material. R

_{A}= 600 Ω and R

_{B}= 100 Ω. The number of times A is longer than B is

6

2

4

5

⇒ For the system of the given figure the closed loop poles are locate

*s*= 0 and

*s*= -2

*s*= 0,

*s*= -l ±

*j*3

*s*= -1 ±

*j*3

*s*= -2 and

*s*= -1 ±

*j*3

⇒ In a medium if ε, μ and σ are constant throughout the medium, then it is known as

perfect vacuum

distributed medium

homogeneous medium

dielectric medium

⇒ In the circuit shown below, the op-amp is ideal, the transistor has V

_{BE}= 0.6 V and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of the op

Positive feedback, V = 10 V

Positive feedback, V = 0 V

Negative feedback, V = 5 V

Negative feedback, V = 2 V

⇒ Which display device resembles vacuum tube?

LED

LCD

VF

None of these

⇒ The magnetic quantum number determines the component of angular momentum along a prescribed direction.

TRUE

FALSE

⇒ The auto correlation of a sampling function is a

triangular function

gate function

signum function

none of the above

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

LP filter

HP filter

notch filter

band stop filter

⇒ The relation between the apparent power, actual power and reactive power is given by

Apparent power = actual power + reactive power

Apparent power = actual power - reactive power

Apparent power = (actual power)

^{2}- (reactive power)

^{2}

Apparent power = (actual power)

^{2}+ (reactive power)

^{2}

⇒ Which of the following is not correct?

In SSB amplitude modulated system, the transmitter circuit has to be more stable leading to better reception

In SSB amplitude modulated system more channel space is available as compared to double sideband amplitude modulated system

In SSB amplitude modulated system the signal is more noise resistant as compared to double sideband system

An SSB-AM system requires lesser power (for the same signal strength) as compared to DSB-AM system

⇒ With the switch in STOP position, Y will be equa

0

1

CLK

none of these

⇒ When negative feedback is used the fractional changes in closed loop gain are desensitized by the factor (1 + A

_{v}β)

TRUE

FALSE

⇒

Match the following:

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

A. | 45 | 1. | 10110100 |

B. | 90 | 2. | 11010010 |

C. | 180 | 3. | 01011010 |

D. | 210 | 4. | 00101101 |

5. | 10101000 |

A-3, B-4, C-5, D-2

A-4, B-3, C-5, D-2

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

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

⇒ A p matching network for coupling the transmitter output of the antenna is shown in figu

minimum D.C. plate current

maximum D.C. plate current

maximum RF antenna current

specified value of the D.C. plate current

⇒ The JFET in the circuit shown in figure has an I

_{DSS}= 10 mA and V

_{p}= -5V. The value of the resistance R

_{s}for a drain current I

_{DS}= 6.4 m

156 Ω

470 Ω

560 Ω

1 kΩ

⇒ Surge current rating of an SCR is

the maximum repetitive surge current in which the SCR can withstand

the maximum non-repetitive surge current in which the SCR can withstand

the maximum repetitive or non repetitive surge current in which the SCR can withstand

the maximum surge current in which the SCR can withstand if both surge current and steady current exist together

⇒ Which of the following theorems is a manifestation of law of conservation of energy?

Tellegen's theorem

Reciprocity theorem

Thevenin's theorem

Norton's theorem

⇒ Which of the following is not a travelling wave?

*e*= E

*sin (β*

_{m}*x*- ω

*t*)

*e*= E

*cos (β*

_{m}*x*- ω

*t*)

*e*= E

*sin (ω*

_{m}*t*- β

*x*)

*e*= E

*sin (β*

_{m}*x*)

⇒ A scheme shown below is to generate a wide band FM modulate sign

30

6

250

12

⇒ As a compared to a CB amplifier, a CE amplifier has

lower current amplification

higher current amplification

lower input resistance

higher input resistance

⇒ A geostationary satellite

is located at a height of 358, 00 km

appears stationary over earth's magnetic pole

is motionless in space but keeps spinning

orbits the earth within a 24 hour period

⇒ In an impedance smith chart, a clockwise movement along a constant resistance circle gives rise to

decrease in the value of reactance

an increase in the value of reactance

no change in the reactance value

no change in the impedance value

⇒ For an P-channel enhancement type MOSFET determine the drain current if K = 0.278 x 10

^{-3}A/V

^{2}, V

_{GS}= -4V, V

_{T}= -2V, Voltage equivalent at 27°C = 26 mV.

10 mA

1.11 mA

0.751 mA

46.98 mA