Electrical Engineering practice bits -26

Electrical Engineering practice bits -26

The following practice bits are useful the Electrical Aspirants  who are preparing for the Different competitive exams like RRB JE ,SSC JE, ECET , GATE , PSU, PGECET,DRDO CEPTAM ,TSTRANSCO, TSGENCO, TSSSPDCL , TSNPDCL AE AND SE, APTRANSCO, APGENCO, ....ETC

MCQ Questions With Answers

1.     The fractional slip of a 3- motor formula is

a.     S=

b.    S=

c.     S=

d.    S=

2.     The principle of operation of an induction motor is based on

a.     Faraday’s law

b.    Rotating magnetic field

c.     Fleming right hand fule

d.    Ohm’s law

3.     The field circuit of an alternator is supplied with

a.     An oscillating current

b.    A direct current

c.     An alternating current

d.    A pulsating current

4.     The frequency generated by a 8 pole alternator rotating at 600 rpm will be

a.     20 Hz

b.    40 Hz

c.     60 Hz

d.    80 Hz

5.     What will happen to 415 V/ 240V, 1KVA transformer when it is connected to a DC supply

a.     Output will be 240 V

b.    Output will be 415

c.     Transformer may burn

d.    Remains as it is

6.     The application of auto  transformer is

a.     Series line boosters

b.    Commercial buildings

c.     Eliminators

d.    Tong tester

7.     the emf equation of a 1- transformer is secondary side is

a.     4.44 fN₁ volt

b.    2.22 N₂ volt

c.     2.22 f volt

d.    4.44 fN₂ volt

8.     In DC motor the back emf(E_b) is directly proportional to ____

a.     Flux

b.    Speed

c.     No of armature conductor

d.    Number of poles

9.     Motor used in electric traction is

a.     Decompounds

b.    Dc shunt

c.     Dc series

d.    All

10.  In dc generator commutator made up of

a.     Brass

b.    Hard drawn copper

c.     Bronte

d.    Steel

11.  A moving iron instrument has a ___

a.     A linear scale

b.    Non linear scale

c.     Exponential scale

d.    Logarithmic scale

12.  Multi meter consists of

a.     Voltmeter and ammeter

b.    Voltmeter and ohm meter

c.     Voltmeter, ammeter, ohmmeter

d.    None

13.  Which one of the following meter belongs to the integrating type instruments

a.     Voltmeter

b.    Ammeter

c.     Energy meter

d.    Watt meter

14.  The unit of sensitivity of the instrument is

a.     Ohm/ volt

b.    Volt/ ohm

c.     Volt-amp

d.    Ampere/sec

15.  The life of tungsten filament lamp is about

a.     1000hours

b.    2000 hours

c.     4000 hours

d.    None

16.  The unit of luminous efficiency is

a.     Lumen/ watt

b.    Watt/ lumen

c.     Lumens

d.    Kwh

17.  A lamp emits total flux of 300 lumens the MSCP of the lamp is

b.    3000  4π

18.  If d is the distance of a surface from a source the illumination upon the surface will vary as

a.     D

b.    D²

19.  Rc oscillator is suitable for generating

a.     High frequencies

b.    Low frequencies

c.     Both

d.    Audio frequencies

20.  The full form of BIS is

a.     Bureau of institute standards

b.    Bureau of indian standards

c.     Bureau of indian supply

d.    Bureau of institute supply

ANSWERS

1.A	2.B	3.B	4.B	5.C	6.A	7.D	8.B	9.C	10.B
11.B	12.C	13.C	14.A	15.A	16.A	17.A	18.D	19.D	20.B

FOR MORE PRACTICE BITS CLICK BELOW LINKS 👇👇👇👇

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-22.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-21.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-20.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-19.html  

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-18.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-17.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-16.html

  👇👇👇👇Android Apps for Students 👇👇👇👇

  

Electrical Machines Nptel Notes

https://play.google.com/store/apps/details?id=com.ElectricalBooksNptelnotes8877129

gate previous papers

https://play.google.com/store/apps/details?id=com.wGATEELECTRICALPREVIOUSPAPERS

ese previous papers 

https://play.google.com/store/apps/details?id=com.wiespreviouspapersee_8969817

nptel Electrical machines videos

https://play.google.com/store/apps/details?id=com.wNptelElectricalmachinesvideos_8943777

nptel power electronics notes

https://play.google.com/store/apps/details?id=com.wNptelPowerelectronicsnotes

Electrical Engineering practice bits -25

Electrical Engineering practice bits -25

The following practice bits are useful the Electrical Aspirants  who are preparing for the Different competitive exams like RRB JE ,SSC JE, ECET , GATE , PSU, PGECET,DRDO CEPTAM ,TSTRANSCO, TSGENCO, TSSSPDCL , TSNPDCL AE AND SE, APTRANSCO, APGENCO, ....ETC

MCQ Questions With Answers

1.     The efficiency of a thermal power plant is about

a.     10%

b.    30%

c.     60%

d.    80%

2.     For low head and high discharge, the hydraulic turbine used is

a.     Francis turbine

b.    Pelton wheel

c.     Kaplan turbine

d.    None

3.     Base load plants are designed to supply power at

a.     High capital cost and low operating cost

b.    Low capital cost and high operating cost

c.     Low capital cost and low operating cot

d.    High capital cost and high operating cost

4.     Which of the following plant is the least reliable

a.     Wind

b.    Tidal

c.     Geothermal

d.    Solar

5.     The expansion of XLPE cable is

a.     X-line ower cable

b.    Cross line polythene enameled cable

c.     Cross linked poly ethylene cable

d.    X-layer of poly ethylene cable

6.     The maximum permissible value of earth resistance for a small substation is

a.     3Ω

b.    2 Ω

c.     6 Ω

d.    1 Ω

7.     Now a day’s fuses are replaced by MCB because they are

a.     Fast operating

b.    Easy operating

c.     Automatic breaking

d.    All the above

8.     While using wooden poles in a service line, the span should not exceeds

a.     100 to 300 m

b.    60 to 100m

c.     50 to 80m

d.    40 to 50 m

9.     What is the other name of PCB(printed circuit board)

a.     Copper laminated boards

b.    Tag boards

c.     Tug boards

d.    Bread boards

10.  The terminals of TRIAC are

a.     Base, collector, emitter

b.    Anode, cathode, gate

c.     MT1, MT2, gate

d.    Source, drain, gate

11.  IGBT stands for

a.     Insulated gate bipolar transistor

b.    Integrated gate bipolar transistor

c.     Insulated gate based trigger

d.    Integrated gate based transistor

12.  The electrical degree of 6 pole of AC motor is

a.     1080⁰

b.    720⁰

c.     540⁰

d.    360⁰

13.  The unit of current density

a.     Ampere/m²

b.    Ampere/ second

c.     Ampere/ m

d.    Amp.m²

14.  How many parallel paths in 6 pole simplex lap wound armature in DC generator is ___

a.     4

b.    6

c.     8

d.    12

15.  The percentage of full load torque develops at starting by universal motor is about

a.     300%

b.    350%

c.     400%

d.    450%

16.  The universal motor works on the same principle of which type of machine

a.     Dc generator

b.    DC motor

c.     AC induction motor

d.    AC generator

17.  In shaded pole single phase motor the revolving field is produced by

a.     Capacitor

b.    Regulator

c.     Shading ring

d.    Winding

18.  The suitable motor for domestic fan is

a.     Dc shunt motor

b.    Dc series motor

c.     1- induction motor

d.    Synchronous motor

19.  The formula to calculating the synchronous speed (N_S) of 3- induction motor is

a.     N_s=

b.    N_s=

c.     N_s=

d.    N_s=

20.  What is the fuse rating that can be selected for a 10 HP induction motor

a.     10A

b.    15A

c.     20A

d.    25A

ANSWERS

1.B	2.C	3.A	4.A	5.D	6.D	7.D	8.D	9.A	10.C
11.A	12.A	13.A	14.B	15.D	16.B	17.C	18.C	19.A	20.D

FOR MORE PRACTICE BITS CLICK BELOW LINKS 👇👇👇👇

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-22.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-21.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-20.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-19.html  

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-18.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-17.html

https://www.electricalforu.com/2020/01/electrical-engineering-practice-bits-16.html

  👇👇👇👇Android Apps for Students 👇👇👇👇

  

Electrical Machines Nptel Notes

https://play.google.com/store/apps/details?id=com.ElectricalBooksNptelnotes8877129

gate previous papers

https://play.google.com/store/apps/details?id=com.wGATEELECTRICALPREVIOUSPAPERS

ese previous papers 

https://play.google.com/store/apps/details?id=com.wiespreviouspapersee_8969817

nptel Electrical machines videos

https://play.google.com/store/apps/details?id=com.wNptelElectricalmachinesvideos_8943777

nptel power electronics notes

https://play.google.com/store/apps/details?id=com.wNptelPowerelectronicsnotes