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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 WIRING
ELECTROMAGNETICS
MEASUREMENT & INSTRUMENTATION
MICROPROCESSOR AND MICROCONTROLLER INTERFACING
POWER ELECTRONICS & DRIVES
POWER SYSTEM
SIGNALS & SYSTEMS
UTILIZATION OF ELECTRICAL ENERGY
ELECTRICAL MACHINES
Q1.
________has the least value of starting torque to full load torque ratio.
d.c. series motor
d.c. shunt motor
slip ring induction motor
squirrel cage induction motor
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Solution
Q2.
The interpoles of a DC machine are normally connected,
In series with the load
In parallel with the load
In series with the shunt field coil
None of the above
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Solution
Q3.
In case the field of a synchronous motor is under excited, the power factor will be
Lagging
Zero
Unity
leading
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Solution
Q4.
A four-speed squirrel cage induction motor uses ………… stator windings.
Four
Three
One
Two
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Solution
Q5.
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
0.87
0.95
0.96
1.06
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Solution
Q6.
Dummy coils are provided in d.c. generators
To reduce eddy current losses.
To amplify voltage.
To enhance flux density.
To mechanically balance the rotor.
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Solution
Q7.
A shunt generator delivers 195 A at a terminal voltage of 250 V. The armature resistance and shunt field resistance are 0.02 Ω and 50 Ω respectively. The iron and friction losses equal 950 W. What is the total copper loss?
475 W
950 W
1250 W
2050 W
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Solution
Q8.
An induction motor and synchronous motor are connected to a common feeder line. To operate the feeder line at unity pf, the synchronous motor should be
under-excited
over-excited
normally excited
disconnected from the common terminals
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Solution
Q9.
The no load current in a transformer lags the applied voltage by ?
about 75 degree
90 degree
0 degree
about 110 degree
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Solution
Q10.
Magnetic field in a D.C. generator is produced by
Electromagnets
permanent magnets
both (A) and (B)
none of the above
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Solution
1
2
3
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