GATE (Graduate Aptitude Test in Engineering) Physics: Questions 136 - 139 of 659

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Question number: 136

» Thermodynamics and Statistical Physics » Classical and Aquantum Statistics

Appeared in Year: 2012

MCQ▾

Question

At a certain temperature T, the average speed of nitrogen molecules in air is found to be . The most probable and the root mean square speeds of the molecules are, respectively –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 137

» Electromagnetic Theory » Energy and Momentum of Electromagnetic Waves

Appeared in Year: 2012

MCQ▾

Question

The space – time dependence of the electric field of a linearly polarized light in free space is given by where and are the amplitude, the angular frequency and the wavevector, respectively. The time average energy density associated with the electric field is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 138

» Quantum Mechanics » One, Two and Three-Dimensional Potential Problems

Appeared in Year: 2012

MCQ▾

Question

A particle of mass is confined in a two dimensional square well potential of dimension . This potential is given by,

The energy of the first excited state for this particle is given by,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 139

» Electronics » Bipolar Junction Transistors

Appeared in Year: 2012

MCQ▾

Question

Consider the following circuit in which the current gain of the transistor is 100.

Circuit consisting a transistor

Circuit Consisting a Transistor

In figure a circuit, which is consisting a transistor of current gain 100, is shown.

Which one of the following correctly represents the load line (collector current with respect to collector – emitter voltage ) and Q – point of this circuit?

Choices

Choice (4) Response

a.

Segment f Segment f: Segment [D, E] Segment g Segment g: Segment [F, G] Segment h Segment h: Segment [G, H] Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [A, C] Vector v Vector v: Vector [A, C] Point G Point G: Point on fPoint G Point G: Point on f15 mA text1 = “15 mA”15 V text1_1 = “15 V”V_ {CE} text1_2 = “V_ {CE} “V_ {CE} text1_2 = “V_ {CE} “I_ {C} text1_3 = “I_ {C} “I_ {C} text1_3 = “I_ {C} “ (2V, 13mA) text1_4 = ” (2V, 13mA) “Q - point text1_5 = “Q - point”

Collector Current vs Collector – Emitter Voltage (Choice A)

In figure collector current vs collector – emitter voltage of transistor is shown.

b.

Segment f Segment f: Segment [D, E] Segment g Segment g: Segment [F, G] Segment h Segment h: Segment [G, H] Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [A, C] Vector v Vector v: Vector [A, C] Point G Point G: Point on fPoint G Point G: Point on f13 mA text1 = “13 mA”15 V text1_1 = “15 V”V_ {CE} text1_2 = “V_ {CE} “V_ {CE} text1_2 = “V_ {CE} “I_ {C} text1_3 = “I_ {C} “I_ {C} text1_3 = “I_ {C} “ (2V, 10mA) text1_4 = ” (2V, 10mA) “Q - point text1_5 = “Q - point”

Collector Current vs Collector – Emitter Voltage (Choice B)

In figure collector current vs collector – emitter voltage of transistor is shown.

c.

Segment f Segment f: Segment [D, E] Segment g Segment g: Segment [F, G] Segment h Segment h: Segment [G, H] Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [A, C] Vector v Vector v: Vector [A, C] Point G Point G: Point on fPoint G Point G: Point on f15 mA text1 = “15 mA”15 V text1_1 = “15 V”V_ {CE} text1_2 = “V_ {CE} “V_ {CE} text1_2 = “V_ {CE} “I_ {C} text1_3 = “I_ {C} “I_ {C} text1_3 = “I_ {C} “ (7.5V, 7.5mA) text1_4 = ” (7.5V, 7.5mA) “Q - point text1_5 = “Q - point”

Collector Current vs Collector – Emitter Voltage (Choice C)

In figure collector current vs collector – emitter voltage of transistor is shown.

d.

Segment f Segment f: Segment [D, E] Segment g Segment g: Segment [F, G] Segment h Segment h: Segment [G, H] Vector u Vector u: Vector [A, B] Vector u Vector u: Vector [A, B] Vector v Vector v: Vector [A, C] Vector v Vector v: Vector [A, C] Point G Point G: Point on fPoint G Point G: Point on f13 mA text1 = “13 mA”15 V text1_1 = “15 V”V_ {CE} text1_2 = “V_ {CE} “V_ {CE} text1_2 = “V_ {CE} “I_ {C} text1_3 = “I_ {C} “I_ {C} text1_3 = “I_ {C} “ (7.5 V, 6.5mA) text1_4 = ” (7.5 V, 6.5mA) “Q - point text1_5 = “Q - point”

Collector Current vs Collector – Emitter Voltage (Choice D)

In figure collector current vs collector – emitter voltage of transistor is shown.

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