Electrical Machines Machine Ratings Online Exam Quiz
Electrical Machines Machine Ratings GK Quiz. Question and Answers related to Electrical Machines Machine Ratings. MCQ (Multiple Choice Questions with answers about Electrical Machines Machine Ratings
If the dimension of a single phase transformer is made sqrt(3) times less than the original structure, then what is new no load current rating of the transformer?
Options
A : 1/sqrt(3)
B : sqrt(3)
C : 3
D : 1/3*sqrt(3)
A 200V, 10 hp, 4 poles, 60 Hz, Y-connected induction motor had full load slip of 5%. Then the rotor speed of the motor with respect to stator is?
Options
A : 1710 rpm
B : 1800 rpm
C : 90 rpm
D : 3510 rpm
If two alternators A and B are operated in parallel having per unit synchronous reactance as 0.02 ohms and 0.05 ohms respectively.Then what the ratio of contributing loading of machine A to B?
Options
A : 2.5
B : 0.4
C : 1
D : can not be operated in parallel
Refer the diagram; a single-phase supply of 100V, 50Hz is fed to the step-up transformer having primary impedance of 1 ohms and secondary impedance 20 ohms. What is the power consumed by the load of 5 ohms?
Options
A : 20 W
B : 40 W
C : 10 W
D : 100 W
The desired voltage regulation for a single phase, 50 Hz transformer is zero. Its pu ohmic drop is 4% and pu reactive drop is 4%. The required power factor angle for the operation in degrees is?
Options
A : 45
B : 90
C : 30
D : 60
For a separately excited dc machine of 25 kW, 250 V and armature resistance of 0.25 ohms, is running at 3000 rpm with supply of 255 V. The electromagnetic power produced at the armature in kilo watts is?
Options
A : 5
B : 10
C : 0.5
D : 8
For a single phase, 50 Hz transformer, if the open circuit test is conducted at 40 Hz. What is the variation in the no-load power factor of the transformer?
Options
A : Decreases
B : Increases
C : Remains constant
D : None of the mentioned
In the lab, two students X and Y conducted the experiments to verify the name plate ratings of the transformer.But student X conducted the same at higher frequency. The kVA reading of student X will be ___________
Options
A : higher than Y’s reading
B : lower than Y’s reading
C : same as Y’s reading
D : none of the mentioned
While conducting lab experiments on DC machine loading, the students are given a machine with its rating as 100 kW maximum rating. Then the _____________
Options
A : machine can’t be overloaded after 100 kW
B : machine can be overloaded after 100 kW
C : machine can be overloaded by 5% for a small time duration
D : machine can be overloaded by 10%
A 3-phase, five limbed shell type transformer, star connected, 200V, 50 Hz, 100 kVA will have ___________
Options
A : no third harmonic current in its phase but has sinusoidal flux
B : third harmonic current in its phase but has flat-topped flux
C : no third harmonic current in its phase but has flat-topped flux
D : third harmonic current in its phase but has sinusoidal flux
Electrical Machines Action Commutator more Online Exam Quiz
Electrical Machines Interview Experienced
Electrical Machines Interview Freshers
Electrical Machines Losses Efficiency
Electrical Machines Losses Efficiency 2
Electrical Machines Machine Applications
Electrical Machines Measurement Xd Xq
Electrical Machines Multiple Choice