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.Management Sciences
Category: Electrical Engineering Mcqs
Which of the following loss in a D.C. generator varies significantly with the load current ?
A. Field copper loss
B. Windage loss
C. Armature copper loss
D. None of the above
Iron losses in a D.C. machine are independent of variations in______________?
A. speed
B. load
C. voltage
D. speed and voltage
The attraction capacity of electromagnet will increase if the_______________?
A. core length increases i
B. core area increases
C. flux density decreases
D. flux density increases
Solid type cables are considered unreliable beyond 66 kV because___________?
A. insulation may melt due to higher temperature
B. skin effect dominates on the conductor
C. of corona loss between conductor and sheath material
D. there is a danger of breakdown of insulation due to the presence of voids
The pulsating d.c. applied to power amplifier causes________________?
A. Burning of transistor
B. Hum in the circuit
C. Excessive forward voltage
D. None of the above
Which of the following is not an operating cost?
A. Maintenance cost
B. Fuel cost
C. Salaries of high officials
D. Salaries of operating staff
Which of the following statements is correct ?
A. The magnetic flux inside an exciting coil is lower than its outside surface
B. The magnetic flux inside an exciting coil is zero
C. The magnetic flux inside the exciting coil is greater than its outside surface
D. The magnetic flux inside the exciting coil is same as on its outside surface
Steam pressure in a steam power station, which is usually kept now-a-days is of the order of____________?
A. 20 kgf/cm2
B. 50 kgf/cm2
C. 100 kgf/cm2
D. 150 kgf/cm2
While calculating Rth in Thevenin’s theorem and Norton equivalent
A. all independent sources are made dead
B. only current sources are made dead
C. only voltage sources are made dead
D. all voltage and current sources are made dead
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