Home I scheme Mcq 22523 Electrical Industrial Ac Machine Mcq pdf Download

22523 Electrical Industrial Ac Machine Mcq pdf Download

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Hello students welcome to msbte news in this article we have provided Industrial Ac Machine Mcq pdf Download. This Industrial Ac Machine Mcqs is ideal for Candidates who are 3rd Year of Diploma in Electrical Engineering.

with the help of Industrial Ac Machine Notes for Diploma pdf Candidates will get to know what exactly you have to write in the msbte final exams. And all though you will get answers solved by msbte board so the answers in Industrial Ac Machine Mcq Online Test is 100% accurate.

In this msbte Ac Machine Mcqs Pdf we have selected 30 Important Questions apparently chosen from Past 2 years papers. This Industrial Machine Msbte I Scheme Mcq Questions will help Students in understanding the basic rules of Online Mcq Exam and paper pattern of 22523 Mcq Questions. At the end of this article we have also provided Ac Machine Mcq pdf Download link You can get it by clicking on Below Link.

Industrial A.C. Machines Questions and Answers pdf

1) If d.c supply is given to a transformer it may
a) work
b) not work
c) give lower voltage than the rated voltage on secondary side
d) burn the winding

Correct!

Wrong!

2) Formula of Synchronous speed NS
a) 140f/P
b) 125f/P
c) 130f/P
d) 120f/P

Correct!

Wrong!

3) The primary and secondary windings of a power transformer always have
a) a common magnetic circuit
b) separate magnetic circuit
c) wire of same size
d) same number of turns

Correct!

Wrong!

4) Different types of transformers are
a) core type
b) shell type
c) berry type
d) All the these

Correct!

Wrong!

5) Formula of Shaft power
a) slip x rotor input power
b) (mechanical power in rotor – friction & windage losses)
c) Motor input power – stator losses
d) [(output power)/(input power)]

Correct!

Wrong!

6) The iron core in a transformer provides a _______ path to a main flux
a) low reluctance
b) high reluctance
c) low resistance
d) high conductivity

Correct!

Wrong!

7) Rating of transformer is given in
a) kVA
b) kVAR
c) kW
d) Watts

Correct!

Wrong!

8) Formula of Efficiency
a) slip x rotor input power
b) Motor input power /stator losses
c) [(output power)/(input power)] x100
d) None of the above

Correct!

Wrong!

9) If rated dc voltage applied instead of ac to the primary of a transformer
a) secondary of transformer will burn
b) primary transformer will burn
c) secondary voltage will be excessively high
d) there will be no secondary voltage

Correct!

Wrong!

10) If a higher voltage is given to the primary and low voltage is taken from the secondary of transformer it is called
a) step-up
b) step-down
c) instrument transformer
d) stabilizer

Correct!

Wrong!

11) The core flux of a practical transformer with a resistance load
a) is strictly constant with load changes
b) increases linearly with load
c) increases as the square root of the load
d) decreases with increase of load

Correct!

Wrong!

12) At every instant the direction of secondary current in a transformer must be such as to oppose any change in flux . This is in accordance with
a) Faraday’s laws
b) Joule’s law
c) Lenz’s law
d) Coulomb’s law

Correct!

Wrong!

13) The inductive reactance of a transformer depends on
a) electromotive force
b) magnetomotive force
c) magnetic flux
d) leakage flux

Correct!

Wrong!

14) If in a transformer the secondary turns are doubled at the same time the primary voltage is reduced by half, then the secondary voltage will
a) be halved
b) be four times as high
c) not change
d) be reduced to quarter

Correct!

Wrong!

15) The flux in transformer core
a) increases with load
b) decreases with load
c) remains constant irrespective of load
d) none of the above

Correct!

Wrong!

16) Transformers are rated in
a) kw
b) kV
c) kWh
d) kVA

Correct!

Wrong!

17) The mutual flux in a loaded transformer can be varied by varying
a) primary current
b) load impedance
c) secondary current
d) reluctance of the magnetic path

Correct!

Wrong!

18) Which is the common method of cooling a power transformer ?
a) Air-cooling
b) Air-blast cooling
c) Oil cooling
d) natural cooling

Correct!

Wrong!

19) The primary ampere-turns are counterbalanced by
a) secondary ampere-turns
b) primary flux
c) increase in mutual flux
d) increase in secondary current

Correct!

Wrong!

20) What type of core is used for a high frequency transformer?
a) open iron core
b) air core
c) closed iron core
d) none of these

Correct!

Wrong!

21) In a transformer_________ decreases with the increase in leakage flux
a) primary induced emf
b) secondary induced emf
c) secondary terminal voltage
d) none of the above

Correct!

Wrong!

22) What is the efficiency of a transformer compared with that of electrical motors of the same power?
a) Much smaller
b) Somewhat smaller
c) About the same
d) Much higher

Correct!

Wrong!

23) 10 KVA , 400V/200V single phase transformer with a resistance of 3 % and reactance of 6% is supplying a current of 50A to resistive load.the voltage across the load is
a) 194 V
b) 196 V
c) 198 V
d) 390 V

Correct!

Wrong!

24) Secondary normal voltage is 220 V. Which of the following statements about it is true?
a) The no-load voltage is more than 220V.
b) 220V is the no-load voltage.
c) At a load which draws the rated current, the voltage becomes less than 220 V
d) The secondary voltage increases with increasing load.

Correct!

Wrong!

25) In a power transformer iron losses remain practically constant from no load to full load this is because
a) Core flux remains constant
b) Leakage flux remains constant
c) Both a and b
d) Neither a nor b

Correct!

Wrong!

26) Upon which factor the short circuit voltage of a transformer mainly depends. It depends
a) on the ohmic resistance of the primary winding
b) on the ohmic resistance of the secondary winding
c) on the cross-sectional area of their core
d) on the magnitude of the leakage flux

Correct!

Wrong!

27) In a power transformer if in place of sinusoidal wave a peaked wave voltage is fed to primary
a) copper losses will be less
b) noise level will be reduced
c) iron losses will be more
d) iron losses will be less

Correct!

Wrong!

28) In a shaded pole motor, shading coils are using to
a) reduce winding losses
b) reduce friction losses
c) produce rotating magnetic field
d) protect against sparking

Correct!

Wrong!

29) Which of the following statements about a transformer having a small short circuit voltage is true?
a) The transformation ratio of the transformer is small
b) During the operation the transformer has high iron losses
c) During operation the transformer has high copper losses
d) A high short circuit current flows through the transformer.

Correct!

Wrong!

30) select the correct answer using the code given below
a) 2 and 3
b) 1 and 2
c) 1 and 4
d) 3 and 4

Correct!

Wrong!

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Industrial Ac Machine Mcq pdf Download

22523 Industrial Ac Machines pdf ()

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