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Description :

The number of electrical degrees ‘passed through’ in one revolution of a 6-pole synchronous alternator is: A) 360 degree B) 720 degree C) 1080 degree D) 2160 degree

Answer :

2

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11.6k views 4 answers
Description :

5(4+1) ÷ 5(5) = ?

Answer :

5(4+1)÷5(5) LHS= 5×4+5×1 20+5 =25 RHS= 5×5= 25 Therefore= 25÷25=1 QED=1

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10.1k views 5 answers
Description :

Three resistors of 4 Ω, 6 Ω and 9 Ω are connected in parallel. Which resistor consumes the maximum power?  (A) 4 Ω (B) 6 Ω (C) 9 Ω (D) 17 Ω

Answer :

(c) 9 ohm

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9.1k views 3 answers
Description :

Draw block diagram of instrumentation system. State function.

Answer :

Primary transducer: The sensor which comes in contact with the measurement medium to sense the quantity. Variable conversion element: the transducer which converts the sensor ... transmitted through suitable transmission medium to the operator or presented with the help of indicators.

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8.5k views 4 answers
Description :

The 8086 fetches instruction one after another from _____ of memory.   (a) Code segment (b) IP (c) ES (d) SS

Answer :

A

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8.2k views 2 answers
Description :

Compare individual and group drive on any four points.  

Answer :

S.No. Point Individual Drive Group Drive 1 Definition In this type of drive each machine has its own separate electric drive (motor). It may be directly coupled ... Lathe Machine (Similar application will be consider) Textile Industry (Similar application will be consider)

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7.9k views 1 answer
Description :

Explain with neat diagram construction and working of Ajax Wyatt vertical core induction furnace.

Answer :

Neat sketch of Ajax Wyatt' vertical core furnace: Construction of Ajax Wyatt' vertical core furnace: Vertical core type induction heating furnace is nothing but transformer. It consists of ... is utilized to melt the charge. Where, R = Resistance of charge & I secondary current.

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7.9k views 1 answer
Description :

Describe the difference between an open circuit and a short circuit.

Answer :

Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

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7.8k views 3 answers
Description :

Can you answer this question? X + X + X = 30 X + Y + Y = 20 Y + Z + Z = 17 X + Y + Z = ?

Answer :

X+Y+Z =21 10+05+6=21

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7.7k views 3 answers
Description :

Which device use to convert DC to AC?

Answer :

Rectifier

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7.4k views 18 answers
Description :

Which of the following is not a basic element of a transformer ?  1. Core 2. Primary winding 3. Secondary winding 4. Mutual flux 

Answer :

A

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6.3k views 2 answers
Description :

List the different errors in wattmeter & explain compensation for it.

Answer :

Errors in Wattmeter Compensation method Error due to connection method To overcome this error, wattmeters are provided with additional compensating winding which is connected in series with ... due to friction The weight of moving system be reduced to minimum possible.

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6.2k views 1 answer
Description :

The size of a conductor used in power cables depends on the:  (A) operating voltage  (C) current to be carried (B) power factor (D) type of insulation used

Answer :

The size of a conductor used in power cables depends on the: current to be carried

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6.1k views 1 answer
Description :

Draw the diagram and explain the working of ferrodynamic type frequency meter. 

Answer :

Ferrodynamic type frequency meter: (Electrical resonance type frequency meter): It consists of a fixed coil. The supply whose frequency is to be measured is connected across it. This coil ... so selected that the moving coil takes up a convenient position when frequency is of normal value. 

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5.9k views 1 answer
Description :

A 6-pole, 50Hz, 3-φ induction motor is running at 950 r.p.m. and has Cu loss of 5kW. The rotor input is (a) 10 kW (b) 95 kW (c) 100 kW (d) 9.5 kW 

Answer :

s=(Ns-N)/Ns =(1000-950)/1000=0.05.rotor cu.loss= s*rotor inputwe have rotor cu loss=5kWtherefore, rotor input= rotor cu.loss/s                              =5kW/0.05                              =100 kW

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5.9k views 4 answers
Description :

Moving iron instruments can be used for measuring (1) Direct currents and voltages (2) Radio frequency currents (3) A.C currents and voltages (4) Both (a) and (c)

Answer :

moving iron instruments areused to measure A.C curents &  voltages

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5.8k views 19 answers
Description :

An Auto-transformer (which has only one winding) may be used as a ______ .  (A) Both Step-Up and Step-Down transformer (B) Step-Down Transformer (C) Step-Up Transformer (D) None of these

Answer :

an autotransformer may used only as step down transformer

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5.7k views 2 answers
Description :

A 120 Ah capacity battery can deliver a current of 8A for a period of

Answer :

A 120 Ah capacity battery can deliver a current of 8A for a period of 15

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5.7k views 1 answer
Description :

Write difference between absolute & secondary instrument.

Answer :

Absolute Instrument Secondary Instrument 1. These give magnitude of quantity in terms physical constants of instruments 1. These give reading directly of the quantity at the time of ... Raleigh current balance. 6. Examples - ammeter, voltmeter, amperehour meter, wattmeter etc.

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5.6k views 1 answer
Description :

Poynting vector wattmeter is based on   (A) Seebeck effect (B) Ferranti effect (C) Induction effect (D) Hall effect

Answer :

Poynting vector wattmeter is based on Induction effect 

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5.6k views 1 answer
Description :

The severity of line to ground and three phase faults at the terminals of an unloaded synchronous generator is to be same. If the terminal voltage is 1.0 pu, Z1=Z2=j0.1 p.u. and Z0= j0.05 p.u. for the alternator, then the required inductive reactance for neutral grounding is   (a) 0.05 p.u. (b) 0.0166 p.u. (c) 0.1 p.u. (d) 0.15 p.u.

Answer :

The severity of line to ground and three phase faults at the terminals of an unloaded synchronous generator is to be same. If the terminal voltage is 1.0 pu, Z1=Z2=j0.1 p.u. and Z0= j0.05 p.u. for the alternator, then the required inductive reactance for neutral grounding is 0.0166 p.u.

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5.6k views 1 answer
Description :

The most efficient method of increasing the speed of a 3.75KW d.c. shunt motor would be  A) Armature control B) Flux control C) Ward—Leonard D) Tapped—field control

Answer :

 Flux control 

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5.5k views 1 answer
Description :

what is lightning arrester?

Answer :

Light arrester is a protecting device which is used at substation for protecting the devices in the substation from lighting phenomenon.      

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5.3k views 6 answers
Description :

Why high voltage is used in power transmission?

Answer :

The primary reason that power is transmitted at high voltages is to increase efficiency. ... The lower current that accompanies high voltage transmissionreduces resistance in the conductors aselectricity flows ... This means that thin, light-weight wires can beused in long-distance transmission.

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5.3k views 2 answers
Description :

Draw the block diagram of basic wind energy conversion system and write function of each block. 

Answer :

Block diagram of basic wind energy conversion system: OR Components of wind power plant and their functions:  1) Rotor /Blade/Aero-turbine: Blade extracts significant power from the ... stronger and smoother. Towers are supports to raise the main part of the turbine up in the air.

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5.3k views 1 answer
Description :

Describe the difference between direct and alternating current.

Answer :

Direct current is the flow of electricity or charge in one direction..  Alternative current is the flow of charge that doesn't flow in one direction. 

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5.2k views 4 answers
Description :

With a neat diagram explain doubly fed induction generator (DFIG). 

Answer :

Diagram of Doubly fed induction generator (DFIG):  Explanation :-  DFIG can feed power through the stator as well as rotor to the grid. The stator is directly connected to the fixed frequency ... voltage is 690 V AC. So it must be step up to 33 KV to connect to power grid.  

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5.1k views 1 answer
Description :

Write two application of the following motor (i) AC servo motor (ii) Stepper motor

Answer :

(i)Applications of AC Servo Motor: 1. Computers 2. Robotics and toys 3. CD/DVD players 4. Textile industries 5. Instrument servos 6. Tracking and guidance system 7. Self- ... Laser cutters 20.Extruders 21.Engravers 22.Analytical and Medical instruments 23.Embroidery Machines 24.Packeging Machines

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5.1k views 1 answer
Description :

What is the difference between relay and contactor?

Answer :

Relay have smaller ratings. Contactor is a high rating relay.

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5.1k views 1 answer
Description :

Is the power line voltage available in our homes a dc or an ac voltage?

Answer :

The power line voltage available in our homes is AC. Mobile dwellings are the most commonly DC-supplied homes and even then they tend to include AC supply for heavier loads.

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5.1k views 1 answer
Description :

List advantages and disadvantages of CNC based drilling machine.

Answer :

Advantages : Reduce the making/production cost Increases the productivity CNC improves the production Low skill operator is required High accuracy and repeatability Complex machining operations are also ... Its replacement is difficult, that it is difficult to change old system to new system

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5.1k views 1 answer
Description :

Draw a circuit diagram of R.C. series circuit. Draw impedance triangle and power triangle for same circuit. 

Answer :

Draw a circuit diagram of R.C. series circuit. Draw impedance triangle and power triangle for same circuit. 

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5.1k views 1 answer
Description :

Describe Twin-tube process with diagram.

Answer :

Twin Tub Process:  A logical extension of the p-well and n-well approaches is the twin-tub fabrication process.  In this process, a substrate of high resistivity of n-type material ... manufacturing tolerances results.  This is particularly important as far as latch up is concerned.

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5.1k views 1 answer
Description :

Explain differential protection of busbar.

Answer :

Differential protection Scheme for bus bar: Under normal conditions the sum of the currents entering the bus bar zone is equal to those leaving it and no current flows through the relay ... . The difference of these currents will flow through the relay coil causing opening of circuit breaker.

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5.1k views 1 answer
Description :

Answer :

Because India uses 220-230volt  In USA there they uses 110volt

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5.1k views 1 answer
Description :

Describe the construction of any one type of capacitor.

Answer :

i) Air capacitors: Air capacitors are capacitors which use air as their dielectric. The simplest air capacitors are made of two conductive plates separated by an air gap. Air capacitors can be made in ... axial form. Essentially the leads either exit the encapsulation at the side or the end.

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5.1k views 1 answer
Description :

What is the 2's complement of 01101? A) 10010 B) 10011 C) 1100 D) 1001 

Answer :

What is the 2's complement of 01101? A) 10010 B) 10011 C) 1100 D) 1001 

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5.1k views 1 answer
Description :

What is the function of an electrical filter ?

Answer :

Filter separates different components that are mixed together. Electrical filter can separate different frequency components. Electrical filters are the electrical circuits which are use to remove unwanted frequency components from the signal.

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5.1k views 1 answer
Description :

State reason BJT is called as bipolar junction transistor.

Answer :

BJT is called bipolar junction transistor because in BJT current conduction takes place due to majority as well as minority charge carriers.

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5.0k views 1 answer
Description :

If we tossed simultaneously two coins. Find the probability of exactly one tail.

Answer :

If we toss two coins simultaneously,there are four possible outcomes HEAD-HEAD  TAIL-TAIL HEAD-TAIL  TAIL-HEAD  so probability of getting exactly one tail=2/4=1/2

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5.0k views 1 answer
Description :

Draw and explain electronic PID controller.

Answer :

Diagram :

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5.0k views 1 answer
Description :

Write down limitation of differential protection of transformer.

Answer :

Limitations of differential protection of transformer: 1) Due to the magnetization characteristics of the CTs used, the ratio errors change with respect to the circulating currents. 2) The pilot wires ... current (higher imbalance) due to which accuracy of sensing & operation is decreased. 

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5.0k views 1 answer
Description :

Without any additional circuitry, an 8:1 MUX can be used to obtain:  (1) Some but not all Boolean functions of 3 variables (2) All function of 3 variables but none of 4 variables (3) All functions of 3 variables and some but not all of 4 variables (4) All functions of 4 variables

Answer :

A

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4.9k views 3 answers
Description :

Application of Norton's theorem to a circuit yields : (A) Equivalent current source only (B) Equivalent voltage source only (C) Equivalent voltage source and impedance in series (D) Equivalent current source and impedance in parallel

Answer :

B

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4.8k views 2 answers
Description :

Shunt compensation in an EHV line is used to (A) Improve stability. (B) Improve the voltage profile. (C) Reduce the fault level. (D) Substitute for synchronous phase modifier.

Answer :

Shunt compensation in an EHV line is used to Improve the voltage profile.

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4.7k views 1 answer
Description :

 In an alternator if the winding is short pitched by 60 electrical degrees, its pitch factor will be: A) 1.0 B) 0.866 C) 0.75 D) 0.50

Answer :

 In an alternator if the winding is short pitched by 60 electrical degrees, its pitch factor will be: A) 1.0 B) 0.866 C) 0.75 D) 0.50

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4.6k views 1 answer
Description :

A negative sequence relay is commonly used to protect  (A) an alternator (B) an transformer (C) a transmission line (D) a bus bar

Answer :

A negative sequence relay is commonly used to protect  an alternator

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4.6k views 1 answer
Description :

Differentiate between core type and core less induction furnace.

Answer :

Sr.No. Core type induction furnace. Core less induction furnace. 1 Less leakage flux  More leakage flux 2 Power factor is good Power factor is poor 3 ... normal frequency is used. Due to high frequency, high voltage supply, time required for heating is less.

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4.5k views 1 answer
Description :

The diagonal elements of a nodal admittance matrix are strengthened by adding :  (A) Shunt capacitors (C) Generators (B) Shunt inductances (D) Resistive loads

Answer :

A

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4.4k views 2 answers
Description :

What does the AND gate do?

Answer :

AND gate multiple two inputs. If any one input is zero output will be zero if both inputs are one then only output is one.

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4.4k views 1 answer
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