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Q1. | An electromagnetic wave can be completely guided by a dielectric rod or slab. |

A. | TRUE [Correct Answer] |

B. | FALSE [Wrong Answer] |

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

⇒ A directional coupler is used to determine

r

_{v}

r

_{v}and VSWR

L and C

wave velocity

⇒ If

*x*= 0.1396 radians, the values of 1 - cos

*x*and 2 sin

^{2}(x / 2) using floating point arithmetic with a 4 digit mantissa are respectively

.1000 E - 1 each

.9727 E - 2 each

.1000 E - 1 and .9727 E - 2 respectively

.9727 E - 2 and .1000 E - 1 respectively

⇒ The data about

*p*the pull required to lift a weight

*w*by a pulley bloc

3.2 + 0.171

*w*

2.28 + 0.1879

*w*

1.2 + 0.25

*w*

0.6 + 0.3

*w*

⇒ For BJT transistor. The maximum power dissipation is specified as 350 mW if ambient temperature is 25°C. If ambient temperature is 60°C the maximum power dissipation should be limited to about

100 mW

250 mW

450 mW

600 mW

⇒ The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by

forward characteristics of thyristors

reverse recovery characteristics of thyristors

both forward and reverse recovery characteristics of thyristors

none of the above

⇒ The source of the harmonic distortion in a RC coupled transistor amplifier is usually

power supply

capacitor

R-C circuit

transistor

⇒ In terms of ABCD parameters, the image parameter Z

_{11}is equal to

AC/BD

BD/AC

AB/CD

AD/BC

⇒

**Assertion (A):** An amorphous material is obtained when mobility of atoms is inhibited during solidification.

**Reason (R):** Crystalline state is a natural state for most solids.

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

⇒ The expression Y (A, B, C) = ∑m (1, 3, 5, 6) is to realized using a multiplexer. Then

use 8 : 1 multiplexer and ground input lines 1, 3, 5, 6

use 8 : 1 multiplexer and ground input lines 0, 2, 4, 7

use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3

use 8 : 1 multiplexer and ground input lines 4, 5, 6, 7

⇒ In a microwave power measurement using bolometer, the principle of working is variation of

inductance with absorption of power

resistance with absorption of power

capacitance with absorption of power

cavity dimension with heat generated by power

⇒ The reverse voltage applied to a varactor diode

is less than avalanche breakdown voltage

is more than avalanche breakdown voltage

may be more or less than a avalanche breakdown voltage

is very high as compared to avalanche breakdown voltage

⇒ Which one of the following statements is correct for MOSFETS?

p channel MOS is easier to produce than n channel MOS

n channel MOS must have twice the area of p channel MOS for the same ON resistance

p channel MOS has faster switching action than n channel MOS

p channel MOS has higher packing density than n channel MOS

⇒ Assuming that

*k*is an integer what would the result of following expression

8

7

7.5

zero

⇒ Programmable logic array uses

RAM matrices

ROMs matrices

PROM matrices

Silo memory

⇒ Which of the following be true for a CE transistor amplifier if the emitter resistor value is made equal to zero?

- Its gain will increase
- Its stability will increase
- Its gain will decrease
- Its stability will decrease

1 and 2

2 and 3

3 and 4

1 and 4

⇒ In an amplifier if conductor during the cycle is from 0 to 90° and again from 180° to 270°, the amplifier will be termed as

class A

class B

class C

class AB

⇒ The data of speed of train V and resistance to motion

6.7 + 0.0092 V

^{2}

3 + 0.001 V

^{2}

3.2 + 0.0012 V

^{2}

5.2 + 0.006 V

^{2 }

⇒ The Boolean expression for the shaded area in the Venn diagra

X + Y + Z

XY + Z + X YZ

X Y Z + XY

X + Y + Z

⇒ A capacitor can be represented by a capacitance C in parallel with a resistance R. For a good capacitor, the resistance R should be

very high

high

very low

low

⇒ Consider the following stateme

1 and 2

2 and 3

3 and 4

4 and 5

⇒ Initially the number decimal 8 is stored. If instruction

`RAL`

is executed twice, the final number stored will bedecimals 8

decimal 16

decimal 32

decimal 2

⇒ The circuit in the given figur

positive logic OR gate

negative logic OR gate

negative logic AND gate

positive logic AND gate

⇒ As the temperature of a pure silicon specimen is increased

the number of free electrons increases

the number of holes decreases

the number of holes increases

the number of free electrons and holes increases

⇒ The turn on time of an SCR is 5 micro second. Its trigger pulse should have

short rise time with pulse width = 2.5 μs

long rise time with pulse width = 3 μs

short rise time with pulse width = 4 μs

long rise time with pulse width = 4 μs

⇒ In CE approximation, the upper end of d.c. load line is called the __________ point and the lower end is the __________ point.

Q, base

base, Q

saturation, cut off

cut off, saturation

⇒ Consider the following:

- Coupling capacitor
- Emitter by-pass capacitor
- Emitter to base diffusion capacitance of the BJT
- Stray capacitance of the circuit.

1 and 2

2 and 3

3 and 4

l and 4

⇒ In an underdamped RLC series circuit, the natural frequency is ω

_{n}. The frequency of damped oscillations is

ω

_{n}

less than ω

_{n}

more than ω

_{n}

2 ω

_{n}

⇒ Consider the following statements regarding electromagnetic flowmeter

- AC excitation is used to avoid polarisation of fluid.
- The meter calibration is changed as viscosity of fluid changes.
- Stainless steel pipes can be used for measuring the flow of liquid of high conductivity.

1, 2, 3 are correct

1 and 2 are correct

2 and 3 are correct

1 and 3 are correct

⇒ To neglect a current source the terminals across the source are

replaced by some resistance

replaced by capacitance

open-circuited

short-circuited

⇒ Measurement of Hall coefficient enables the determination of

recovery time of stored carrier

type of conductivity and concentration of charge carriers

temperature coefficient and thermal conductivity

Fermi level and forbidden energy gap