Hello students welcome to msbte news in this article we have provided Industrial Ac Machines Mcq Online Exam. 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 Industrial Ac Machine Book Pdf Download link You can get it by clicking on Below Link.
Table of Contents
Industrial Ac Machines Mcq Online Exam
1)Â In a transformer electrical power is transferred from primary to secondary
a) Through air
b) By magnetic flux
c) Through insulation medium
d) None of these
Correct!
Wrong!
2)Â Transformer works on
a) a.c
b) d.c
c) a.c and d.c both
d) pulsating d.c
Correct!
Wrong!
3) applications of stepper motors.
(A) Computer controlled systems
(B) Extruders
(C) Tape drives
(D) all of the above
Correct!
Wrong!
4) The two windings of transformers are
a) Conductively linked
b) Inductively linked
c) Not linked at all
d) Electrically linked
Correct!
Wrong!
5) Transformer works on the principle of
a) self-induction
b) mutual induction
c) Faraday’s law of electromagnetic induction
d) self and mutual induction both
Correct!
Wrong!
6) In an ideal transformer on no-load, the primary applied voltage is balanced by
a) the secondary voltage
b) the drop across resistance and reactance
c) the secondary induced emf
d) the primary induced emf
Correct!
Wrong!
7) Transformer action requires a
a) constant magnetic flux
b) increasing magnetic flux
c) alternating magnetic flux
d) alternating electric flux
Correct!
Wrong!
8) Transformer is device which transform the voltage
a) from higher level to lower level
b) from lower level to higher level
c) both a and b
d) none of these
Correct!
Wrong!
9) List different torques in synchronous motor
(A) Starting torque
(B) Running torque
(C) Pull-in torque
(D) all of the above
Correct!
Wrong!
10) The flux created by the current flowing through the primary winding induces emf in
a) primary winding only
b) secondary winding only
c) transformer core only
d) both primary and secondary windings
Correct!
Wrong!
11) A 50 Hz transformer having equal hysteresis and eddy current losses at rated excitation is operated at 45 Hz at 90% of its rated voltage. Compared to rated operating points, the core losses under this condition.
a) reduced by 10%
b) reduced by 19%
c) reduced by 14.5%
d) remain unchanged
Correct!
Wrong!
12) When secondary of the transformer is loaded , the current in the primary side will
a) not be affected
b) increase
c) decrease
d) be the sum of no-load current and excessive current drawn due to secondary current.
Correct!
Wrong!
13) A 1-ph transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected to a voltage of 330 V, 50 Hz, the eddy current loss will be
a) 168.75 W
b) 112.5 W
c) 75 W
d) 50 W
Correct!
Wrong!
14)Â Electric power is transferred from one coil to the other coil in a transformer
a) electrically
b) electromagnetically
c) magnetically
d) physically
Correct!
Wrong!
15) 1 kVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be
16) A transformer operates
a) 30 watts
b) more than 30 w
c) less than 30 w
d) zero watt
Correct!
Wrong!
16) A transformer operates
a) always at unity power factor
b) has its own power factor
c) at a power factor below a particular value
d) at power factor depending on the power factor of the load
Correct!
Wrong!
17) At 50 Hz operation, a single phase transformer has hysteresis loss of 200 W and eddy current loss of 100 W. Its core loss at 60 Hz operation will be
a) 432 W
b) 408 W
c) 384 W
d) 360 W
Correct!
Wrong!
18)Â The laminations are made from
a) silicon sheet steel
b) nickel alloy steel stamping
c) low carbon steel
d) chrome steel sheets
Correct!
Wrong!
19) On no-load phasor diagram of transformer, the core loss component of the current remains in phase with
a) no-load current
b) primary supply voltage
c) core flux
d) primary induced voltage
Correct!
Wrong!
20) Power transformer are designed to have maximum efficiency around ——– full load
a) Nearly
b)70%
c)50%
d) 25%
Correct!
Wrong!
21) In any single phase transformer, the primary and secondary induced voltages are
a) 180 degrees out of phase
b) 90 degrees out of phase
c) in phase
d) none of these
Correct!
Wrong!
22)Â In any transformer, the voltage per turn in primary and secondary remains
a) always same
b) always in ratio of K
c) always different
d) sometimes the same.
Correct!
Wrong!
23) If the percentage resistance of a power transformer for secondary side is 2.5 percent and turn ratio is 1:10, the percentage secondary resistance referred to primary will be
a) 25
b) 2.5
c) 0.25
d) 0.025
Correct!
Wrong!
24) The transformer efficiency will be maximum at a power factor of
a) 0.8 lead
b) Unity
c) 0.8 lag
d) 0.5 lag or lead
Correct!
Wrong!
25) A 4kva, 400/200 V 1-ph transformer has resistance of 0.02 pi and reactance of 0.06 pu. Its actual resistance and reactance referred to hv side, are, respectively
a) 0.2 ohm and 0.6 ohm
b) 0.8 ohm and 2.4 ohm
c) 0.08 ohm and 0.24 ohm
d) 2 ohm and 6 ohm
Correct!
Wrong!
26) Why is there an enamel layer coated over the lamination of the transformer core?
a) To decrease the hum
b) To attain adhesion between the lamination
c) To insulate the laminations against each other
d) To prevent the corrosion of the laminations.
Correct!
Wrong!
27) Positive voltage regulation is an indication of ____ load
a) inductive
b) capacitive
c) either inductive or capacitive
d) pure resistive
Correct!
Wrong!
28)Â Which of the following statements about a short-circuit power transformer is true?
a) There is a fuse in its primary circuit
b) There is a bimetallic switch in its primary circuit
c) There is a fast magnetic switch in its primary circuit
d) The short-circuit current can continuously flow through it without causing a damage
Correct!
Wrong!
29) The effect of armature flux on main flux is called an armature reaction.
(A) True
(B) False
Correct!
Wrong!
30) When the excitation is adjusted in such a way that the magnitude of induced e.m.f. is less than the applied voltage (Eb < V), the excitation is called under excitation.
a) True
b) False
Correct!
Wrong!
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