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Machine
Q1.Eddy Current Loss will Depends on
Frequency
Flux density
Thickness
All of the above
Correct Option :4
Q2.Thin laminations are used in a Machine in Order to Reduce
Eddy current losses
Hysteresis losses
Both 1 and 2
Copper losses
Correct Option :1
Q3.In DC Machine Yoke Offers
Mechanical Protection to the Machine
Flux Path Completion
Produce Working Flux
Both A and B
Correct Option :4
Q4.N DC Generators Brushes are Used For
Collecting of Current Without Any Sparkings
Collecting of Voltage
Reduce Eddy Current Loss
Convert Ac Armature Current in to Dc
Correct Option :1
Q5.Which of the Following Bearings and Their Uses are Correct
Ball Bearings ? Small Machines
Roller Bearings ? Large Machines
Neither 1 Nor 2
Both A and B
Correct Option :4
Q6.Inter Pole Winding is Connected in-------------------------- ?
Series with Armature
Series with Main Poles
Parallel with Armature
Parallel with Main Poles
Correct Option :1
Q7.The Type of Generator Used for Arc Welding Purpose is a
Series Generator
Shunt Generator
Cumulatively Compounded Generator
Differentially Compounded Generator
Correct Option :1
Q8.A 4-Pole Dc Generator Runs At 1500 rpm. The frequencyof Current in the Armature Winding is
25 Hz
50 Hz
0 Hz
100 Hz
Correct Option :1
Q9.Which of the Following is Not a Part of Transformer?
Commentator
Radiator
Tap changer
Conservator Tank
Correct Option :1
Q10.Dissolve Gas Analysis of Tansformer Oil is Carried Out to Determine
Condition of Transformer Oil.
Condition of Transformer.
Condition of Bushings
Condition of bushing stud
Correct Option :2
Q11.Tertiary Winding in a Transformer is Mostly
Star connected
Delta connected
zig - zag star connected
zig - zag delta connected
Correct Option :2
Q12.When Operating, two or More Transformers in Parallel, % Impedance of These Transformers Should B
Inversely Proportional to MVA Rating of Transformers
Proportionate to MVA Rating of Transformers.
Same
Such That Actual Impedance of all Transformers Would be Same
Correct Option :2
Q13.Tap Changer is Generally Provided in
Current Transformer
Power transformer
Voltage transformer
Earthing transformer
Correct Option :1
Q14.which of the Following Machine Will Have Maximum Efficiency
Electrical Power Transformer
Electrical Power Generator
DC motor
Induction motor
Correct Option :1
Q15.In a Step Down Transformer Which one of The Following Statements is True?
Number of Secondary Turns is Less than Primary Turns
Secondary Power is Less Than Primary Power
Secondary Current is Less Than Primary Current
Number of Secondary Turns is More Than that of Primary
Correct Option :1
Q16.For Satisfactory Parallel Operation of Two Transformers Which of the Following Conditions is Most Essential
Polarities of All Transformers Must be Same
Percentage Impedance of All Transformers Must Be Same.
Voltage Ratio of All Transformers Must be Same
MVA Rating of All Transformers Inversely Proportional to Impedance
Correct Option :1
Q17.The Short Circuit Test on a Transformer is Conducted to Obtain
Core Loses Only
Eddy Current Loss
Hysteresis Loss
Copper Losses
Correct Option :4
Q18.Lamination of Transformer Core is Made of
Cast Iron
Silicon Steel
Wrought Iron
Cast Steel
Correct Option :1
Q19.which of the Following is Minimized by Laminating the Core of a Transformer
Hysteresis Loss
Eddy Current Loss
Copper loss
Stray loss
Correct Option :2
Q20.Breather is Provided in a Transformer To
Absorb Moisture of Air During Breathing
Provide Cold Air in Transformer
Filter the Transformer Oil
None
Correct Option :4
Q21.Slip Rings of An Induction Motors are Made of
Carbon
Stainless Steel
Aluminium
Phosphor Bronze
Correct Option :4
Q22.The Speed of a 50 Hz Three Phase Induction Motor Under Full Load Condition is 725 Rpm The Number of Poles of The Motor Are ______________.
2
4
6
8
Correct Option :1
Q23.The Torque Developed in Induction Motor is Nearly Proportional to
1 / V
V2
V
1 / V2
Correct Option :1
Q24.Synchronous Motors Installed at the Substation Give
Unity Power Factor
Lagging Power Factor
Leading Power Factor
None of These
Correct Option :1
Q25.Normally Star- Delta Starter is Used Where Load is
Less Than 5Kw
More Than 5 Kw
Both (a) and (b)
D. None of These
Correct Option :2
Q26.The Rotation of Induction Motor can be changed by Changing of -
Any Two Phases
By Inserting Resistance in Phases
By Reducing Voltage
By Reducing Frequency
Correct Option :1
Q27.The Field Winding of a Three Phase Synchronous Machine is Excited by
Single Phase Ac Supply
There Phase Ac Supply
DC Supply
None
Correct Option :3
Q28.If The Pole of Induction Motor is Reduced by Half, the Speed of Motor Will be-
Double
Same
Half
One Forth
Correct Option :1
Q29.The Best Application of DC Series Motor is
Drinking Water Pump
Same
Train
Crane
Correct Option :3
Q30.Frequtly Used Motor in Electrically Operated Crane Is
DC Shunt Motor
DC Compound Motor
Synchronous Motor
Slip Ring Induction Motor
Correct Option :1
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