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.Management Sciences
Category: Electrical Engineering Mcqs
Dry cell is modification of____________?
A. Deniell cell
B. Leclanche cell
C. Lead-acid cell
D. Edison cell
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
A. By changing the number of stator poles
B. Rotor rheostat control
C. By operating two motors in cascade
D. By injecting e.m.f. in the rotor circuit
A transistor behaves as a linear device for _____________?
A. Small signals only
B. Large signals only
C. Both small and large signals
D. None of the above
Due to which of the following reasons copper and aluminium are not used for heating elements ?
A. Both have great tendency for oxidation
B. Both have low melting point
C. Very large length of wires will be required
D. All of the above
The mcrease in heat dissipation by air blasts is due to increase in______________?
A. conduction
B. convection
E. radiation
D. any ofthe above
For a buck converter to reduce the conduction losses in diode
A. A high on – resistance switch can be added in parallel
B. A low on – resistance switch can be added in parallel
C. A high on – resistance switch can be added in series
D. A low on – resistance switch can be added in series
In deriving ac equivalent circuit for an amplifier circuit, we short circuit___________?
A. all resistors
B. all transistors
C. all inductors
D. all capacitors
The hfe parameter is called ______________in CE arrangement with output shorted?
A. Voltage gain
B. Current gain
C. Input impedance
D. None of the above
When the load is above _______________ a synchronous motor is found to be more economical?
A. 2 kW
B. 20 kW
C. 50 kW
D. 100 kW
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