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Short-circuiter is used in repulsion start induction run motor.

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In a two value capacitor motor, the capacitor used for running purposes is paper spaced oil filled type.

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The repulsion-start induction-run motor is used because of high starting torque.

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The motor used on small lathes is usually single-phase capacitor run motor.

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A shaded pole motor can be used for toys, hair dryers, circulators etc.

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A centrifugal switch is used to disconnect starting winding when motor has picked up about 50 to 70 per cent of rated speed.

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Description :

List standard voltage level used in India. 

Answer :

Standard voltage level used in India: * Generation Voltage : 3.3KV, 6.6KV,11KV and 17.5 KV,21KV (Now a days generation voltage is in the range of 11KV- 33KV) * Primary Transmission voltage :- 220 ... voltages in India are 765 KV (750KV), 400KV, 220KV, 132KV, 110KV, 66KV, 33KV, 22KV, 11KV.

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55 views 1 answer
Description :

State the insulating materials used in motor. Write temperature class and withstand temperature ranges for them. 

Answer :

The insulating materials used in motor are as belows: 1. Cotton, 2. Silk, or paper, 3. Press board, 4. Resins 5. PVC 6. Cellulose-Fiber, 7. Enameled coating, etc  ... Over 180° Mica, porcelain, ceramics, glass quartz, asbestos, treated glass fiber or treated asbestos. etc.

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72 views 1 answer
Description :

State different types of holders used in wiring installation.

Answer :

Following types of holders used in wiring installation: 1. Pendent Holder 2. Batten Holder 3. Angle holder 4. Screwed holder 

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Description :

Enlist the luminaries used in factory lighting and lux level required in various areas.

Answer :

Area Luminaries Lux level Office building Fluorescent tube, LED, CFL 500 lux Testing centre Fluorescent tube, LED, CFL 400 to 500 lux Workshop/work place Halogen ... , LED, CFL, Projector lamp, filament lamp, Halogen Lamp, Metal Halide lamp etc Above 600 Lux

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70 views 1 answer
Description :

State functions of ; i) Cable box ii) Guard wire iii) Shackle insulator iv) Stay wire used in service connection

Answer :

i) Function of Cable box: To hold and inspect incoming and outgoing terminals  ii) Function of Guard wire : A grounded conductor placed beneath an overhead transmission line in order to ground ... in service connection: To give mechanical Support to pole, line and prevent leakage current if any

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Description :

Give the classification of the errors used in measuring instrument & state the reason for their occurrence.

Answer :

Types of errors in measuring instruments:  A) Gross error: These are due to mistakes on the part of person using the instrument.  B) Systematic Error:  i) Instrumental Error: These ... multiplying factor.  C) Random error: These persist even after gross and systematic errors are removed. 

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83 views 1 answer
Description :

Name the material used for :- (i) Moving coil (ii) Permanent magnet in PMMC instrument.

Answer :

(i) Material used for Moving coil: Copper, Aluminum( some times)  (ii) Permanent magnets are made of special alloys such as :  Aluminum-Nickel-Cobalt (Alnicos)  Strontium-Iron  Neodymium-Iron-Boron  Samarium-Cobalt.

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State the use of shunt and series resistance used in extension of meter.

Answer :

Use of shunt and series resistance: i) Use of shunt: To extend the range of Ammeter. ii) Use of series resistance: To extend the range of Voltmeter.

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Light triggering is mainly used in

Answer :

Light triggering is mainly used in High voltage direct current transmission

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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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Auto reclosing is used in case of

Answer :

Auto reclosing is used in case of air blast C.B.

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The IC chips, used in computers, is made of  (1) Iron oxide (2) Silicon (3) Graphite (4) Silica

Answer :

2 These are made on silicon wafers which is aa semi conductor. ...

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The material used in liquid fuses is  (1) SF6 (3) carbon tetra chloride (2) distilled water (4) transformer oil

Answer :

The material used in liquid fuses is  carbon tetra chloride

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307 views 1 answer
Description :

A differentiator is not usually used in control system, because it : - (A) reduces damping  (B) increases error  (C) reduces gain margin  (D) increases input noise

Answer :

A differentiator is not usually used in control system, because it : - increases input noise

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Description :

A dummy strain gage is used in a quarter bridge strain gage circuit to :  (A) compensate for changes in temperature and lead wire resistance  (B) produce more output voltage from the bridge  (C) increase the sensitivity of the bridge  (D) compensate lead wire resistance only

Answer :

A dummy strain gage is used in a quarter bridge strain gage circuit to : compensate for changes in temperature and lead wire resistance 

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Description :

The range of frequencies used in induction heating is :  (A) 0-25 Hz  (C) less than 200 Hz  (B) 50 to 100 Hz  (D) more than 1 kHz

Answer :

The range of frequencies used in induction heating is : more than 1 kHz

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Description :

Stepper motors are used in  (1) printers (2) lifts (3) amplifiers (4) oscillators

Answer :

Stepper motors are used in printers 

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In a dc machine, interpoles are used to  (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Answer :

In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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Description :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be  (1) unaffected (2) decreased (3) increased (4) either decreased or increased depending on the direction of the DC field

Answer :

An unshielded moving iron voltmeter is used to measure the voltage in an AC circuit. The stray DC magnetic field having a component along the axis will be either decreased or increased depending on the direction of the DC field

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The storage battery generally used in electric power stations is  (1) zinc carbon battery (2) lead acid battery (3) nickel cadmium battery (4) lithium -ion battery

Answer :

The storage battery generally used in electric power stations is lead acid battery 

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Series capacitive compensation in EHV transmission line is used to

Answer :

To maintain voltage stability 

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Which of the following elements are used as dopants in silicon or germanium semiconductors? A) Antimony B) Phosphorus C) Arsenic D) All the above

Answer :

Which of the following elements are used as dopants in silicon or germanium semiconductors? A) Antimony B) Phosphorus C) Arsenic D) All the above

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The frequencies and voltage used in Dielectric heating are (A) 10 – 30 MHz, upto 25 kV (B) 50 – 60 Hz, upto 25 kV (C) 10 – 30 MHz, upto 100 V (D) 50 – 60 Hz, 110 V – 230 V

Answer :

The frequencies and voltage used in Dielectric heating are 10 – 30 MHz, upto 25 kV

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Regulating-transformers are used in power systems for control of

Answer :

Regulating-transformers are used in power systems for control of power flow

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The effect of a finite gain of an operational amplifier used in an integrator is that (A) it would not integrate (B) the slope of the output will vary with time (C) the final value of the output voltage will reduce (D) there will be instability in the circuit

Answer :

The effect of a finite gain of an operational amplifier used in an integrator is that there will be instability in the circuit

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Silicon steel is used in electrical machines because it has?

Answer :

Silicon steel is used in electrical machines because it has low hysteresis loss.

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Description :

What type of biasing is used in CE amplifier?

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Answer :

The voltage used for suburban trains in D.C. system is usually 600 to 750 V.

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Answer :

Commonly used instruments in power system measurement are induction.

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Answer :

For handling greater currents induction wattmeters are used in conjunction with current transformers.

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Answer :

In D.C. machines fractional pitch winding is used to reduce the sparking.

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Description :

Answer :

The capacitors used in single-phase capacitor motors have no polarity marking.

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Description :

Answer :

The electric motor used in portable drills is universal motor.

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Description :

Answer :

 Sandwich type winding is used in 3 phase shell-type transformer.

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Description :

The damping winding in synchronous motor is generally used to?

Answer :

The damping winding in synchronous motor is generally used to provide starting torque and prevent hunting.

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135 views 1 answer
Description :

What are the five types of single phase motors used in the industry?

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Description :

Which type of motor is used in lift?

Answer :

Synchronous motor

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Description :

Which motor is used in traction system?

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Description :

What are the electromagnetic waves used in remote control?

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Description :

Draw a neat sketch and explain the accessory used to support long work.

Answer :

Accessory to support long work: A steady rest is a tool for a lathe, enabling a machinist to make deep cuts in long, slender stock, bore out thin pieces of metal, and generally keeps thin stuff straight. ... tool that follows the cutter, a steady rest is firmly attached to the bed of a lathe.

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24 views 1 answer
Description :

Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer :

Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

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78 views 1 answer
Description :

State the material used for making (1) Magnetic Core (2) Fuse element  

Answer :

The material used for making of:  (1) Magnetic Core : Iron, cobalt, Nickel, CRGO, HRGO , silicon steel  (2) Fuse Element: Tin- lead wire, Tinned copper wire 

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70 views 1 answer
Description :

List any four materials used for pattern making

Answer :

The various types of materials used are as follows: 1. Wood 2. Metal. 3. Plastic. 4. Plaster. 5. Wax.

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57 views 1 answer
Description :

List any four accessories used on lathe.

Answer :

The various accessories used in lathe are as follows. 1) Lathe centers 2) Carriers or driving dog 3) catch plates 4) Chucks 5) Face plates 6) Angle plates 7) Mandrels 8) Rests

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54 views 1 answer
Description :

State properties of conductor material used for overhead conductor. 

Answer :

Following are the properties of conductor material:-   1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value. 

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