Hello students welcome to msbte news in this article we have provided Industrial Ac Machines Mcq with Answers pdf. 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 Automation Mcq pdf Download link You can get it by clicking on Below Link.
Table of Contents
Industrial Ac Machines Mcq with Answers pdf
1) Application of A.C Series Motor:
(A) Sewing machines
(B) Drilling machine
(C) Stone crushing machine
(D) all of the above
Correct!
Wrong!
2)Â A transformer transforms
a) voltage
b) current
c) voltage and current
d) frequency
Correct!
Wrong!
3)Â If lower voltage is given to the primary and higher voltage is taken from the secondary of a transformer, it is called
a) step up
b) step down
c) current transformer
d) voltage stabilizer
Correct!
Wrong!
4) Different starting methods of three phase synchronous motors.Â
a) By using an Induction (Pony) motor
b) By using a DC Machine / Source
c) By using Damper windings
d) all of the above
Correct!
Wrong!
5) For an ideal transformer the window should have
a) maximum resistance on primary side and least resistance on secondary side
b) least resistance on primary side and maximum resistance on secondary side
c) equal resistance on primary and secondary sides
d) no ohmic resistance on either side
Correct!
Wrong!
6) If the input voltage is 100 V and output voltage is 200 V, which side of the transformer windings will be primary
a) 200 V side
b) 100 V side
c) Winding with more turns
d) Winding with less turns.
Correct!
Wrong!
7) The change in terminal voltage from no-load to full-load is expressed as a fraction or percentage of no-load voltage, keeping the speed and field excitation constant. Is called voltage Regulation of an alternator.Â
a) True
b) False
Correct!
Wrong!
8) Two phase windings are placed in the stator slots at 180 degree electrically apart from each other.Â
a) True
b) False
Correct!
Wrong!
9) The core flux in transformer depends mainly on
a) supply voltage
b) supply voltage and frequency
c) supply voltage frequency and local
d) supply voltage and load but independent of frequency
Correct!
Wrong!
10)Â Shell-type transformer is commonly used because
a) it has more magnetic flux leakage
b) it has less magnetic flux leakage
c) it has two magnetic paths
d) both b and c are correct
Correct!
Wrong!
11)Â Which of the following is a correct statement about eddy current?
a) Eddy currents improve the efficiency of a motor.
b) Eddy currents do not influence the movement.
c) Eddy current heat up the metal parts
d) Eddy currents are used for welding.
Correct!
Wrong!
12) In a transformer core, 3rd and 5th harmonic components of fluxes are respectively 10% and 4% of the fundamental flux. The 3rd and 5th harmonic induced emfs in the winding, in terms of the fundamental induced emfs are respectively
a) 30%, 20%
b) 10%, 12%
c) 50%, 20%
d) 50%, 12%
Correct!
Wrong!
13) The steel for construction of transformer core is made to have
a) high permeability and low hysteresis loss
b) low permeability and high hysteresis loss
c) low permeability and low hysteresis loss
d) high permeability and high hysteresis loss
Correct!
Wrong!
14)Â In a transformer, the exciting current will be in phase quadrature with the impressed voltage provided
a) only the leakage impedance drop is ignored
b) only the core loss is ignored
c) both the leakage impedance drop and the core loss are ignored
d) only the no-load copper loss is ignored
Correct!
Wrong!
15) As compared to an amplifier , a transformer cannot
a) increase the output voltage
b) increase the output current
c) increase output power
d) none of these
Correct!
Wrong!
16) The power factor of a power transformer on no load will be about
a) unity
b) 0.75
c) 0.5
d) 0.35
Correct!
Wrong!
17) The power factor of a transformer on no load is poor due to
a) magnetizing reactance of the transformer
b) open-circuited secondary
c) low primary winding resistance
d) low no-load current
Correct!
Wrong!
18) A sinusoidal emf
a) lags the flux inducing it by 180 degrees
a) lags the flux inducing it by 90 degrees
a) leads the flux inducing it by 90 degrees
a) leads the flux inducing it by 180 degrees
Correct!
Wrong!
19) Primary winding of a transformer comprises two identical windings in parallel. If one winding is removed, magnetizing current will be
a) halved
b) the same
c) doubled
d) increased four
Correct!
Wrong!
20)Â The magnitude of mutual flux in a transformer is
a) low at low loads and high and high loads
b) high at low loads and low at high loads
c) same at all loads
d) varies at low loads and constant at high loads
Correct!
Wrong!
21)Â The induced emf in the secondary of a transformer will depend on
a) frequency of the supply only
b) number of turns in secondary only
c) maximum flux in the core only
d) frequency , flux and number of turns in the secondary .
Correct!
Wrong!
22)Â Full load voltage regulation of a power transformer is zero when power factor of the load is near
a) unity and leading
b) zero and leading
c) zero and lagging
d) unity and lagging
Correct!
Wrong!
23)Â A transformer has a turns ratio of 1 to 10 and a resistance of 5000 ohms is connected across the secondary terminals, the resistance offered to a current flowing in the primary will be
a) 50 ohms
b) 500 ohms
c) 5000 ohms
d) 50 kilo ohms
Correct!
Wrong!
24)Â In a transformer zero voltage regulation at full load is
a) not possible
b) possible at leading power factor load
c) possible at lagging power factor load
d) possible at unity power factor load
Correct!
Wrong!
25) Two transformers are operating in parallel, they will share the load depending upon their
a) efficiency
b) ratings
c) leakage reactance
d) per-unit impedance
Correct!
Wrong!
26) zero sequence current flows from a line into a transformer bank if the windingsare
a) Grounded star/delta
b) Delta/star
c) Star/grounded star
d) Delta/delta
Correct!
Wrong!
27)Â magnetizing current in transformer rich in harmonics
a) 3rd harmonic
b) 5th harmonic
c) 6th harmonic
d) 4th harmonic
Correct!
Wrong!
28) Transformer fed from a fundamental frequency voltage source, the source of  harmonic is the
a) Overload
b) Poor insulation
c) Iron loss
d) Saturation of core
Correct!
Wrong!
29) The outer cage of a double squirrel rotor consists of
a) Manganese brass
b) Red copper
c) Bronze
d) Steel
Correct!
Wrong!
30)Â In the equivalent ckt of a double-cage induction motor, the two rotor cages can be considered
a) To be parallel
b) To be in series-parallel
c) To be in series
d) To be in parallel with stator
Correct!
Wrong!
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