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Q1. | Electrical contact materials used in switches, brushes, relay must possess |

A. | high thermal conductivity and high melting point [Correct Answer] |

B. | low thermal conductivity and low melting point [Wrong Answer] |

C. | high thermal conductivity and low melting point [Wrong Answer] |

D. | low thermal conductivity and high melting point [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss 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 :**

⇒ In case of surface waves the field strength at a point is directly proportional to

antenna height

wave frequency

current of the antenna

distance of the point from the antenna

⇒ For a second order system, the position of poles is shown in the given figure. This syste

undamped

overdamped

underdamped

critically damped

⇒ The magnetization 'm' of a superconductor in a field of H is

extremely small

- H

-1

Zero

⇒ The output

*v*-

*i*characteristics of enhancement type MOSFET has

only an ohmic region

only a saturation region

an ohmic region at low voltage value and a saturation region at high voltage

a saturation region at low voltage value and an ohmic region at high voltage

⇒ Earth's curvature affects the effective height of antenna.

TRUE

FALSE

⇒ A wire has a resistance R ohm. If another wire of the same material and same weight has double the diameter (as compared to the first wire), the resistance of the second wire will be

0.5 R

0.25 R

0.125 R

R/16

⇒ In Z

_{RC}(

*s*) = 0 at

*s*= ∞, the last element in first Cauer form is

R

C

R and C in series

R and C in parallel

⇒ A clipper

adds a dc component to the input signal

removes signal voltages above or below a specified value

both (a) and (b)

either (a) or (b)

⇒ A DAC has full scale output of 5 V. If accuracy is ± 0.2% the maximum error for an output of 1 V is

5 mV

10 mV

2 mV

20 mV

⇒ Which of the following elements act as donor impurities?

- Gold
- Phosphorus
- Boron
- Antimony
- Arsenic
- Indium

1, 2 and 3

1, 2, 4, and 6

3, 4, 5 and 6

2, 4 and 5

⇒ The fourier transform of the half cosine pulse as shown below is _______

0.5 {sin [0.5(

*f*- 1)] + sin [0.5 (

*f*+ 1)]}

0.25 [sin c[0.25 (

*f*- 2)1 + sin c[0.25(

*f*+ 2)]]

0.5 {sin c [0.5 (

*f*- 1)] + sin c [0.5 (

*f*+ 1)]}

sin c(

*f*- 0.5) + sin c (

*f*+ 0.5)

⇒ For a flexible cable, most suitable insulation is

magnesium oxide

glass fibre

insulating tape

polyvinyl chloride

⇒ In a single phase half wave ac regulator feeding a resistive load, the rms load current

is always positive

may be positive or negative

is always negative

can be even zero

⇒ If two time varying signals of equal magnitudes and 90° phase displacement are applied to X and Y plates of CRO, the display will be

a straight line

a circle

an ellipse

a rectangle

⇒ In FM, as bandwidth increases

distortion increases

distortion decreases

distortion remains unaffected

all

⇒ The concentration of minority carriers in an extrinsic semiconductor under equilibrium is

directly proportional to the doping concentration

inversely proportional to doping concentration

directly proportional to intrinsic concentration

inversely proportional to the intrinsic concentration

⇒ A short grounded vertical antenna has a length L which is 0.05λ at frequency

*f*. If its radiation resistance at

*f*is R ohms, then its radiation resistance at a frequency 2

*f*will be

R/2Ω

RΩ

2RΩ

4RΩ

⇒ A direct current can be measured

directly by dc potentiometer

by dc potentiometer in conjunction with a standard resistance

by dc potentiometer in conjunction with volt ratio box

none of the above

⇒ In order to receive a vertical polarized wave, the conductor of the dipole should be mounted

horizontally

vertically

at an angle of 45°

at an angle of 90°

⇒ F's complement of (2BFD)

_{hex}is

E 304

D 403

D 402

C 403

⇒ Impedance level of Impatt diodes is generally lower than that of Gunn diodes

TRUE

FALSE

⇒

Match the following:

List I (Operator) | List II (Description) | ||
---|---|---|---|

A. | & & | 1. | Assignment |

B. | | | | 2. | Logical AND |

C. | = | 3. | Logical OR |

A-1, B-2, C-3

A-2, B-3, C-1

A-3, B-2, C-1

A-1, B-3, C-2

⇒ Which of following antenna not produces circular polarisation?

Helical

Parabolic

Disc

Yagi

⇒

Match the following:

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

A. | Television | 1. | Either AM or FM used |

B. | Radio | 2. | Both AM and FM are used |

C. | Radar | 3. | PCM is used |

D. | Data Communication | 4. | Digital system |

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

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

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

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

⇒ In a polyatomic gas, the types of polarization which exist together are

electronic and orientational

electronic and ionic

ionic and orientational

electronic, orientational and ionic

⇒ The Fourier series of an odd periodic function contains

odd harmonics only

even harmonics only

cosine harmonics only

sine harmonics only

⇒ A 1000

*k*H

*z*carrier wave modulated 40% at 4000 H

*z*is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after transmission through this circuit?

0.4

0.2

0.27

0.54

⇒ The absorption of radio waves by atmosphere depends on

their frequency

their distance from the transmitter

the polarization of atmosphere

the polarization of the waves

⇒ According to maximum power transfer theorem, the maximum power is absorbed by one network from another network when

the impedance of one of the networks is half that of the other

the impedance of one is the complex conjugate of the other

the impedance of one is equal to that of the other

none of the above

⇒ In a N-type semi-conductor, the concentration of minority carriers is mainly depends on

the number of acceptor atoms

the number of donor atoms

the extent of doping

the temperature of the material