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What is electrical engineering

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Satellites used for international communication are called Intelsat.

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1 answer 10 views

The Ku frequency band used in satellite communication (for uplink and downlink) is: (1) 14 GHz and 11 GHz (2) 30 GHz and 20 GHz (3) 70 GHz and 50 GHz (4) 60 GHz and 45 GHz 

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In satellite communication, scrambling is mainly used for -  A) I clock recovery B) encryption C) limiting power spectral density D) bandwidth efficiency

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Go-stationary satellites are placed in equatorial orbits at the height approximately  a. 1000 km b. 15000 km 0. 25000 km d. 36000 km

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What are the types of electronic communication?

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Companders are used in communication systems to:  (1) Compress bandwidth (2) To improve frequency response (3) To improve signal to noise ratio (4) None of these

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The third generation relays - digital relays - are the basis of distribution system automation because of their: a. Self fault diagnostic capabilities b. Computing capabilities c. Easy interface for remote communication d. All of the above

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The basic element of radio communication system which generates radio waves is  1. micro phone 2. transmitter 3.transmitting antenna 4. Loudspeaker 

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What is the meaning of Electronics and Communication Engineering?

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What is the definition of electronic communication?

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Attitude control in satellites is necessary for pointing to the desired regions on earth (a) the power supplies (b) the amplifiers (c) the directional antennas aboard (d) the motors

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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Most commonly used filter in SSB generation are  (a) mechanical filters (b) RC filters (c) LC filters (d) low pass filters

asked Apr 9, 2018 in Electronics communication by Shimroz123
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The most common device used for detection in radio receivers is   (A)amplifier (B) triode (C) diode (D) transistor

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A combination of various colors used for text and other presentation elements is called  (1) Fill effect (2) Template (3) Color scheme (4) C-set 

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The standard protocol used for sending Internet e-mail is called  (1) Telnet (2) POP (3) SMTP (4) HTTP

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 34 views

Reflector mirrors employed for exploiting solar energy are called the  (1) Mantle (2) Heliostats (3) Diffusers (4) Ponds

asked Apr 30, 2018 in Power system by Shimroz123
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The difference of the reference input and the actual output signal is called  (a) error signal (b) controlling signal (c) actuating signal (d) transfer function

asked Apr 9, 2018 in Electronics communication by Shimroz123
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In satellite communication, frequency modulation is used because satellite channel has  a. High modulation index  b. Small bandwidth and negligible noise  c. Large bandwidth and severe noise   d. Maximum bandwidth and minimum noise

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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Regenerative repeaters are placed along the communication path to control:  a. Power b. Noise c. Frequency d. Amplitude 

asked May 17, 2018 in Telecommunication Engineering by anonymous
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The bandwidth and S/N of a communication system are 3MHz and 30dB respectively. The channel capacity (in Mbps) is around  A) 30 B) 300 C) 0.3 D) None of these

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
1 answer 9 views

 The international standard of Length is defined in terms of : - a) Length of earth's meridian passing through Paris b) The distance between two lines engraved on a Platinum -iridium Bar c,) Wavelength in vacuum, of radiation of Krypton -86 atom cP None of the above

asked Apr 14, 2018 in Instrumentation and control by Shimroz123
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International ohm is defined in terms of the resistance of?

asked Mar 25, 2018 in Basic concepts by Shimroz123
1 answer 29 views

 For the protection of parallel feeders fed from one end, the relays used are: A) non-directional relays at the source-end and directional relays at the load-end B) non-directional relays at both the ends C) directional relays at the source-end and non-directional at the load-end D) directional relays at both the ends

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For extra high voltage ac transmission lines, conductors used are (a) All aluminium (b) All steel (c) AAAC (d) ACSR

asked May 26, 2018 in Electric Power Transmission by Shimroz123
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Instruments transformers are used on a.c. circuits for extending the range of (a) ammeters (b) voltmeters (c) wattmeters (d) all of these 

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1 answer 13 views

In a 3-phase voltage source inverter used for speed control of induction motor, anti-parallel diodes are used across each switching device. The main purpose of diodes is to:

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1 answer 79 views

Wagner's earth devices are used in AC bridge circuits for (a) Eliminating the effect of earth capacitances (b) Eliminating the effect of intercomponent capacitances (c) Eliminating the effect of stray electrostatic fields (d) Shielding the bridge elements

asked May 13, 2018 in Instrumentation and control by Shimroz123
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Regulating-transformers are used in power systems for control of

asked Apr 26, 2018 in Switchgear And Protection by Shimroz123
1 answer 47 views

Surge absorbers are used for protection against

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The large d.c. motors used in steel rolling mills are always provided with compensating . windings for (a) opposing the armature mmf (b) maintaining the voltage (c) maintaining the speed (d) none of these

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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Regulating transformers are used in power systems for control of : a) voltage b) power factor c) power flow d) all of the above

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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Hall effect transducers are generally used for the measurement of (A) Magnetic field (B) Current (C) Electric field (D) Pressure

asked Apr 14, 2018 in Electrical Engineering by Shimroz123
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 A Wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of: - a) Resistance of the connecting lead b) Thermoelectric EMFs c) Contact resistance d) all the above

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For low voltage applications (below 1 kV),_______cables are used. (A) paper insulated (B) plastic (C) single core (D) oil filled

asked Apr 11, 2018 in Computer Engineering by Shimroz123
1 answer 18 views

Four bits are used for packet sequence numbering in a sliding window protocol used in computer network. What is maximum window size?  A) 4 B) 8 C) 15 D) 16

asked Apr 11, 2018 in Computer Engineering by Shimroz123
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For what purposes are views used?  (1) To hide columns only (2) To hide rows only (3) To hide complicated SQL statements only (4) All of the above are uses for SQL views.  

asked Apr 10, 2018 in Computer Engineering by Shimroz123
1 answer 11 views

 Dummy strain gauges are used for : -  a) compensation of temperature changes b) increasing the sensitivity of bridge in which they are included c) compensating for different expansion d) calibration of strain gauge

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
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 Capacitive transducers are normally used for : -  a) static measurements b) dynamic measurements c) both static and dynamic measurements d) transient measurements

asked Apr 10, 2018 in Instrumentation and control by Shimroz123
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Pilot relaying schemes are used for the protection of   (a) Bus bars (b) Transformer (c) Instrument transformer (d) Transmission line 

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Isolators are used for disconnecting a circuit when   (a) Line is energised (b) Line is on full load (c) Line carries no current (d) Can be operated under any condition 

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
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Differential relays are used for the protection of equipments against   (a) Internal faults (b) Over current (c) Reverse current (d) Reverse power

asked Apr 10, 2018 in Electrical Engineering by Shimroz123
1 answer 29 views

Which of the following semiconductor materials is (are) used for manufacturing solar cells?  (1) Gallium arsenide (2) Indium arsenide (3) Cadmium sulfide (4) All of these

asked Apr 9, 2018 in Electronics Engineering by Shimroz123
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X-rays are used for the study of crystal structure because  (a) X-rays are completely absorbed by the crystal (b) the wavelength of X-ray is of the same order of magnitude in the inter-atomic spacing in crystals (c) the wavelength of X-rays is very small in comparison with the inter-atomic spacing in crystals (d) the crystals are completely transparent to X-rays

asked Apr 9, 2018 in Physics by Shimroz123

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