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Q1. | In a piezoelectric crystal, application of a mechanical stress would produce |

A. | plastic deformation of the crystal [Wrong Answer] |

B. | magnetic Dipoles in the crystal [Wrong Answer] |

C. | electric polarization in the crystal [Correct Answer] |

D. | shift in the Fermi level [Wrong Answer] |

View Answer
Explanation:-
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**Also Read Similar Questions Below :**

⇒ A full adder is to be implemented using half adders and OR gates. A 4 bit parallel adder without any initial carry requires

8 half adders and 4 OR gates

8 half adders and 3 OR gates

7 half adders and 3 OR gates

7 half adders and 4 OR gates

⇒ For a directional coupler the power is in the ratio of

40 dB

30 dB

20 dB

10 dB

⇒

Match the following:

List I (Transmission system) | List II (Mode) | ||
---|---|---|---|

A. | Rectangular waveguide | 1. | TE/TM |

B. | Circular waveguide | 2. | TEM |

C. | Coaxial line | 3. | Quasi TEM |

D. | Microstrip line |

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

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

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

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

⇒ If

*f*(

*t*) = -

*f*(-

*t*) satisfies Drichlet conditions, then

*f*(

*t*) can be expanded in Fourier series containing

only sine terms

only cosine terms

cosine terms and constant

sine terms and constant

⇒ The three sides of an admittance triangle denote

G, B, Y

R, X, Y

G, B, Z

(R, Y, Z) or (R, X, Z)

⇒ Which of the following statement is false?

The zener diode is uses as a constant voltage source

The SCR is a silicon rectifier with a gate electrode to control when current flows from cathode to anode

The gate electrode in the FET corresponds to the collector in a bipolar transistor

None of the above

⇒ Bit is a unit of

entropy

information

channel capacity

rate of information

⇒ An RL series circuit has an impedance of 20 Ω when frequency is 25 Hz. At

*f*= 50 Hz, the impedance will be

40 Ω

20 Ω

less than 40 W but more than 20 Ω

less than 20 W but more than 10 Ω

⇒ If

*e*= 10 sin(10

^{8}

*t*+ 3 sin 10

^{4}

*t*) then the deviation is

4.77 kHz

47.7 kHz

477 kHz

4770 kHz

⇒ As temperature increases the number of free electrons and holes in an intrinsic semiconductor

increases

decreases

remains the same

may increase or decrease

⇒ What does the B register contain after the first MOV B, A has been executed?

40 H

60 H

80 H

80 D

⇒ An RC impedance function has a constant value at

*s*= 0. The last element in the first cauer synthesis

will be a capacitor

may be R or C

will be R

will depend on the behaviour of function at

*s*= ∞

⇒

- P(
*s*) =*s*^{4}+*s*^{3}+ 2*s*^{2}+ 4*s*+ 3 - Q(
*s*) =*s*^{4}+ 2*s*^{3}+*s*

*s*) and Q(

*s*) polynomials?

Both P(

*s*) and Q(

*s*) are Hurwitz

Both P(

*s*) and Q(

*s*) are non-Hurwitz

P(

*s*) is Hurwitz but Q(

*s*) is non-Hurwitz

P(

*s*) is non-Hurwitz but Q(

*s*) is Hurwitz

⇒ A λ/8 section of transmission line is determined of load impedance of (2 -

*j*5) Ω. If characteristic impedance of line is 10 Ω. Then input impedance of line is

10 Ω

(6.9 +

*j*7.24) Ω

(1.75 +

*j*3.098) Ω

(2 -

*j*5) Ω

⇒ Voltage series feedback (Also called series-shunt feedback) results in

increase in both I/P and O/P impedances

decrease in both I/P and O/P impedances

increase in I/P impedance and decrease in O/P impedance

decrease in I/P impedance and increase in O/P impedance

⇒ Stability factor for S is given by for a fixed bias

1 + β

1 - β

1/β

β - 1

⇒ A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.

130 p

1.3 p

120 p

12 p

⇒ It is required to measure angular position. Out of the transducers

- Circular potentiometer
- LVDT
- E pick up
- Synchro

1, 2, 3, 4

2 and 3

1, 2, 4

1 and 4

⇒ The decorative lighting works on the principle of

periodic switching on and off

special inverter

rectifier

motor

⇒ The simplified logic expression for the circuit of the given figur

Y = A

Y = AB

Y = A + B

Y + A + B

⇒ A silicon sample A is doped with 10

^{18}Atoms/cm

^{3}of Boron. Another sample B of identical dimensions is doped with 10

^{18}atoms/cm

^{3}of phosphorus. The ratio of electron to hole mobility is 3. The ratio of conductivity of the sample A to B is

3

42738

42769

42796

⇒ A varactor diode is

reverse biased

forward biased

biased to breakdown

unbiased

⇒ In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in

the carry status flag

the auxiliary carry status flag

sign status flag

zero status flag

⇒ In a 3 phase full converter, the firing angle is less than 60°. The instantaneous output voltage

will have positive part only

will have both positive and negative parts

may have both positive and negative parts

will have negative part if load is inductive

⇒ 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

⇒ A meter has a resistance of 1 Ω and full scale deflection current of 1 mA. To convert into an ammeter of 1 A range, the shunt resistance should be

1000 Ω

1 Ω

0.01 Ω

0.001 Ω

⇒ A circuit using an op-amp is shown in the given figure. It

voltage series feedback

voltage shunt feedback

current shunt feedback

current series feedback

⇒ The M.K.S. unit of magnetic field intensity is

ampere

ampere/metre

volt

volt/metre

⇒ A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20°C. If thermal resistance is 1.6° C/W, the junction temperature is

114°C

164°C

94° C

84° C

⇒

**Assertion (A):** Holes are majority carriers in *p* type semiconductor.

**Reason (R):** In *p* type semiconductor, the electrons produced by thermal agitation recombine with holes.

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 but R is false

A is false but R is true