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 material has nearly zero temperature-coefficient of resistance? |

A. | Carbon [Wrong Answer] |

B. | Porcelain [Wrong Answer] |

C. | Copper [Wrong Answer] |

D. | Manganin [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 :**

⇒ Efficiency of class A power amplifier is very poor.

TRUE

FALSE

⇒

**Assertion (A):** A class C amplifier is a timed amplifier which needs a tank circuit as the load in the collector circuit of the transistor for its proper operation

**Reason (R):** In class C operation collector current flows for less than 180° of the ac cycle and thus flows in pulses

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

⇒ Given a power supply filter circuit, what measurements must be made of determine percentage regulation

current through and voltage across the capacitor

d.c. load voltage and r.m.s. load voltage

current through load and voltage across load resistance

number of turns and gauge of secondary winding of transformer

⇒

**Assertion (A):** Hall effect is observed in all metals but is very appreciable in semiconductors.

**Reason (R):** Hall effect transducer is very suitable for measurement of magnetic flux density.

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

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

A is true R is false

A is false R is true

⇒ Two phasors having rms values V

_{1}and V

_{2}which are added to give a phasor having rms value V

_{3}. V

_{3}is maximum if phase angle between V

_{1}and V

_{2}is

90°

180°

270°

360°

⇒

*e*

^{-3}

*is a*

^{t}energy signal

power signal

Both (a) and (b)

none

⇒ In the given figure shows a logic circuit. The minimum Boolean expression for this circui

A + B

A + B + C

AB + C

AB + AC + BC

⇒ A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its wavefor

8 rectangular

8 triangular

4 triangular

4 rectangular

⇒ In a series regulated power supply circuit, the voltage gain A

_{v}, of the 'pass' transistor satisfies the condition

A

_{v}→ ∞

1 << A

_{v}< ∞

A

_{v}≈ 1

A

_{v}<< 1

⇒ What will happen to a bird sitting on a conductor?

It will die of shock

It will not die of shock because its claws are insulated

It will not die because it is insulated from earth and other conductors

None of the above

⇒ The phase velocity

*v*in a transmission line is

LC

C/L

L/C

1/LC

⇒ The phenomenon known as "Early effect" in a BJT refers to a reduction of the effective base width caused by

electron-hole recombination at the base

reverse biasing of the base collector junction

forward biasing of emitter base junction

the early removal of stored base charge during saturation to cut off switching

⇒ Which of these devices is used in relaxation oscillator?

UJT

SCR

DIAC

TRIAC

⇒ Which is a digital coding technique?

PCM

DM

DPCM

All

⇒ If the number of ways an event may result ins analysed into

*m*successes and

*n*failures, each equally likely to occur, the probability of success in a single trial is

*m*(

*m*+

*n*)

TRUE

FALSE

⇒ For a rectangular waveguide (

*a*x

*b*,

*a*>

*b*) to support only the TE

_{10}mode at wavelength which one of the following pairs of in equalities is to be satisfied?

*b*< λ < 2

*b*; λ > 2

*a*

*b*< λ < 2

*b*; λ < 2

*a*

*a*< λ < 2

*b*; λ < 2

*a*

*a*< λ < 2

*b*; λ > 2

*a*

⇒ Consider the circuit shown below of 2 : 1 MUX is given by the function

*g*=

*ac*+

*bc*

X ⊕ Y

XY + EXY

XE + XY

none of these

X ⊕ Y

XY + EXY

XE + XY

none of these

⇒ In a virgin specimen of iron, the direction of spontaneous magnetisation varies from domain to domain.

TRUE

FALSE

⇒ If transfer function of a system is H(

minimun phase

maximum phase

mixed phase

none

⇒ The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

sign of charge carrier

density of charge carrier

both sign and density of charge carrier

none of the above

⇒ A two winding transformer is feeding a single phase half wave rectifier circuit. The load is purely resistive. The rms value of transformer secondary current is I

I

I

I

I

⇒ In the expression

2.1 / 1.2

1.2 * 3.1

2.1 / 1.2 * 3.1

3 / 7.1

⇒ A 6 MHz channel is used by a digital signalling system initializing four-level signals. The maximum possible transmission rate is

6M bands/s

12M bands/s

6 M bits/s

12M bits/s

⇒ If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.

TRUE

FALSE

⇒ In a two phase servomotor the two stator windings have a phase difference of

30°

45°

90°

135°

⇒ In equally tampered musical scale, an octave is divided into

12 intervals

10 intervals

7 intervals

5 intervals

⇒ The forbidden energy gap for germanium is

0.12 eV

0.32 eV

0.72 eV

0.92 eV

⇒ In the circuit of figure the current through 5 Ω resistance at

⇒ Choose the appropriate turn on and turn off time of a FET

1 ns, 10ns

6 ns, 18ns

4 ns, 8 ns

10 ns, 10 ns

⇒ In

I

I

V

I

⇒ In a virgin specimen of iron, the direction of spontaneous magnetisation varies from domain to domain.

TRUE

FALSE

⇒ If transfer function of a system is H(

*z*) = 6 +*z*^{-1}+*z*^{-2}then system isminimun phase

maximum phase

mixed phase

none

⇒ The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

sign of charge carrier

density of charge carrier

both sign and density of charge carrier

none of the above

⇒ A two winding transformer is feeding a single phase half wave rectifier circuit. The load is purely resistive. The rms value of transformer secondary current is I

_{s}and rms value of load current in I_{rms}. ThenI

_{s}= I_{rms}irrespective of the value of firing angleI

_{s}= 0.5 I_{rms}irrespective of the value of firing angleI

_{s}= I_{rms}if firing angle is less than 30°I

_{s}= I_{rms}if firing angle is more than 30°⇒ In the expression

*b*= 2.1 / 1.2 * 3.1 + 3 / 7.1 * 6 which operation would have the first priority in C?2.1 / 1.2

1.2 * 3.1

2.1 / 1.2 * 3.1

3 / 7.1

⇒ A 6 MHz channel is used by a digital signalling system initializing four-level signals. The maximum possible transmission rate is

6M bands/s

12M bands/s

6 M bits/s

12M bits/s

⇒ If there are no permanent dipoles in a dielectric material, the dielectric constant is independent of temperature.

TRUE

FALSE

⇒ In a two phase servomotor the two stator windings have a phase difference of

30°

45°

90°

135°

⇒ In equally tampered musical scale, an octave is divided into

12 intervals

10 intervals

7 intervals

5 intervals

⇒ The forbidden energy gap for germanium is

0.12 eV

0.32 eV

0.72 eV

0.92 eV

⇒ In the circuit of figure the current through 5 Ω resistance at

*t*= 0^{+0.1666666666666672.5 A3.1 A0}⇒ Choose the appropriate turn on and turn off time of a FET

1 ns, 10ns

6 ns, 18ns

4 ns, 8 ns

10 ns, 10 ns

⇒ In

*h*parameter representation, the independent variables areI

_{1}and V_{2}I

_{2}and V_{1}V

_{1}and V_{2}I

_{1}and I_{2}