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MCQ
BASIC ELECTRONICS
CONTROL SYSTEM ENGINEERING
DIGITAL ELECTRONICS
ELECTRICAL CIRCUIT ANALYSIS
ELECTRICAL ENERGY CONSERVATION AND AUDITING
ELECTRICAL ENGINEERING MATERIALS
ELECTRICAL MACHINES
ELECTRICAL VEHICLES
ELECTRICAL WIRING
ELECTROMAGNETICS
MEASUREMENT & INSTRUMENTATION
MICROPROCESSOR AND MICROCONTROLLER INTERFACING
POWER ELECTRONICS & DRIVES
POWER SYSTEM
SIGNALS & SYSTEMS
UTILIZATION OF ELECTRICAL ENERGY
ELECTRICAL MACHINES
Q1.
What is the relation between the electrical torque and mechanical torque in steady state?
The electrical torque should be greater than mechanical torque.
The electrical torque should be either more or less comparing to the mechanical torque.
The electrical torque is equal and opposite to mechanical torque.
The mechanical torque should be greater than electrical torque.
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Solution
Q2.
The losses in electric machine increases as ________of the linear dimension of machine.
Cube
Square
Inverse
Inverse square
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Solution
Q3.
When a 440/220V transformer is connected to 400 V D.C. supply
The output will be 0 V
The transformer may burn
The output will be 220 V
The output will be less than 230 V
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Solution
Q4.
The kVA rating of Three-phase transformer with Voltage = 200V and Current = 100A will be :
34.64 kVA
75 kVA
20 kVA
None of the above
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Solution
Q5.
A 40 kVA, single-phase transformer has 901 turns on the primary and 100 turns on the secondary. The primary is connected to a 2000 V, 50 Hz supply. Determine the maximum value of flux.
0.0018 Weber
0.0125 Weber
0.01 Weber
0.025 Weber
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Solution
Q6.
The in-rush current in a transformer at no load is maximum if the supply voltage is switched on at
Peak voltage value
Half peak voltage value
Zero voltage value
0.866 times peak voltage value
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Solution
Q7.
When load on a transformer is increased, the eddy current
Is increased.
Remains unchanged.
Is decreased.
Becomes zero.
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Solution
Q8.
The inductive reactance of a transformer depends on
electromagnetive force
magnetomotive force
magnetic flux
leakage flux
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Solution
Q9.
A single phase transformer has a turn ratio of 6. Resistance and reactance of the primary winding are 0.9 ohm and 5 ohm respectively and those of secondary are 0.03 ohm and 0.13 ohm respectively. If 330 V at 50 Hz be applied to HV winding with LV winding short circuited, find current in LV winding.
100 A
200 A
400 A
300 A
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Solution
Q10.
The open circuit test of a transformer gives information about
hysteresis loss
eddy current loss
copper loss
both hysteresis & eddy current losses
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Solution
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2
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