Hello students welcome to msbte news in this article we have provided Industrial Ac Machine Mcq Question Bank. 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 Machines Mcq with Answers pdf Download link You can get it by clicking on Below Link.

Polytechnic Industrial Ac Machine Mcq Online Test

1)*State function of following parts in Induction motor

Stator
a) Stator core houses stator winding.
b) Stator winding produces rotating magnetic field.
c) Stator frame supports the core, terminal box and protects the inner parts
d) all of the above

Correct!

Wrong!

2) The basic function of a transformer is to change
a) the level of the voltage
b) the power level
c) the power factor
d) the frequency

Correct!

Wrong!

3) Transformer is used to change the values of
a) voltage
b) frequency
c) power
d) power factor

Correct!

Wrong!

4) *State function of following parts in Induction motor

Slip ring
a) Provides facility to connect external resistance to rotor circuit through brushes for starting and controlling.
b) The rotor winding terminals are permanently connected to the slip rings
c) Both b) & c)
d) all of the above

Correct!

Wrong!

5) In an ordinary transformer which of the following does not change
a) Voltage
b) Current
c) Frequency
d) All of the above

Correct!

Wrong!

6) The path of the magnetic flux in a transformer has
a) high reluctance
b) low resistance
c) high conductivity
d) low reluctance

Correct!

Wrong!

7) Application of Table fan
a) Capacitor split phase motor
b) Capacitor start capacitor run motor
c) CNC system
d) Both a) & b)

Correct!

Wrong!

8) The efficiency of the power transformer is
a) 50%
b) 60%
c) 80%
d) 95%

Correct!

Wrong!

9) Transformer is a
a) Rotating device
b) Static device
c) Magnetic device
d) none of the above

Correct!

Wrong!

10) Application of Mixers and Grinders
a) Universal motor
b) A.C. Series motor
c) Electric watches
d) Both a) & b)

Correct!

Wrong!

11) When the excitation is adjusted in such a way that the power factor of the motor becomes unity, the excitation is called critical excitation.
a) True
b) False

Correct!

Wrong!

12) when voltage is transformed from primary to secondary then it is__________
a) multiplied by k2
b) multiplied by k
c) divided by k2
d) divided by k

Correct!

Wrong!

13) The transformer is commonly used because
a) it has high efficiency
b) frequency remains constant
c) construction cost per kVA is less as compared to other machines
d) All of these

Correct!

Wrong!

14) The excitation to the field winding for which the induced e.m.f. becomes greater then applied voltage (Eb > V), is called over excitation.
a) True
b) False

Correct!

Wrong!

15) The applied voltage of a certain transformer is increased by 75% while the frequency of the applied voltage is reduced by 25%. The maximum core flux density will
a) increase by seven times
b) increase by three times
c) reduce to one quarter
d) remain the same

Correct!

Wrong!

16) The emf induced in the secondary winding depends upon

  1. a) number of turns

a) number of turns
b) flux
c) supply frequency
d) all of these

Correct!

Wrong!

17)  The low voltage winding of a 400/230 V single phase 50 HZ transformer is to be connected to a 25 HZ supply. In order to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be
a) 230 V
b) 460 V
c) 115 V
d) 65 V

Correct!

Wrong!

18)  When the secondary of the transformer is loaded , the flux in the transformer will
a) remain constant
b) directly proportional to secondary current
c) directly proportional to the current drawn by primary winding
d) none of these

Correct!

Wrong!

19) When the excitation is adjusted in such a way that the magnitude of induced  e.m.f. is equal to the applied voltage (Eb = V), the excitation is called normal excitation.
a) True
a) True

Correct!

Wrong!

20) Which of the statements given below is true for the auto transformer?
a) It has to separate windings connected in series externally
b) it has only one winding
c) it can only step down the voltage
d) it is most suitable for power transformation

Correct!

Wrong!

21) power transformed from primary to secondary depends upon
a) number of primary turns
b) number of secondary turns
c) current transformation ratio
d) magnetic coupling b/w primary and secondary winding

Correct!

Wrong!

22) The self induced voltage of a coil depends upon
a) the voltage applied to the coil
b) the shape of the iron core
c) the shape of the bobbin
d) the number of turns of the coil

Correct!

Wrong!

23)  A transformer is supplying pure resistive load. The power factor on primary side will be
a) about 0.95(lead)
b) about 0.95(lag)
c) zero
d) unity

Correct!

Wrong!

24) Which of the following is a correct statement about eddy currents?
a) Eddy currents improve the efficiency of a motor
b) Eddy currents heat up the copper winding
c) Eddy currents heat up the metal parts
d) Eddy currents are used for arc welding.

Correct!

Wrong!

25) The phasor diagram of a transformer on load can be drawn only if we know
a) equivalent circuit parameters of the transformer
b) load current
c) load p.f.
d) all of the above

Correct!

Wrong!

26) The use of higher flux density in transformer designv
a) increases the weight per kVA
b) decreases the weight per kVA
c) increases the weight per kW
d) decreases the weight per kW

Correct!

Wrong!

27)  When a transformer is operating on no-load, the primary applied voltage is approximately balanced by
a) primary induced emf
b) secondary induced emf
c) terminal voltage across the secondary
d) voltage drop across the resistance and reactance

Correct!

Wrong!

28) The transformer oil used in transformers provides
a) insulation and cooling
b) cooling and lubrication
c) insulation and lubrication
d) insulation ,cooling and lubrication

Correct!

Wrong!

29) In the transformer circuit mode, the core loss is represented as a
a) series resistance
b) series inductance
c) shunt resistance
d) shunt inductance

Correct!

Wrong!

30)  The main purpose of performing open circuit on a transformer is to measure its
a) Copper losses
b) Iron losses
c)Total losses
d) Insulation resistance

Correct!

Wrong!

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