⚡Electrical Engineering MCQs
Electrical Engineering MCQs
499 MCQs11
The normal value of adhesion friction is______________?
A0.12
B0.25
C0.40
D0.75
12
Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
Ait has longer free running period
Bit has longer coasting period
Caccelerating and braking periods are comparatively smaller
Dall of the above
13
The specific energy consumption of a train depends on which of the following ?
AAcceleration and retardation
BGradient
CDistance covered
DAll of the above
14
The air resistance to the movement of the train is proportional to_____________?
Aspeed
B(speed)
C(speed)
D1/speed
15
The pulsating torque exerted by steam locomotives causes which of the following ?
AJolting and skidding
BHammer blow
CPitching
DAll of the above
16
Co-efficient of adhesion reduces due to the presence of which of the following ?
ASand on rails
Band
COil on the rails
Dboth
17
Tractive effort is required to_____________?
Aovercome the gravity component of train mass
Bovercome friction, windage and curve resistance
Caccelerate the train mass
Ddo all of the above
18
Due to which of the following co-efficient of adhesion improves ?
ARust on the rails
BDust on the rails
CSand on the rails
DAll of the above
19
For given maximum axle load tractive efforts of AC. locomotive will be_____________?
Aless than that of
Bmore than that of
Cequal to that of
Dnone of the above
20
Which of the following is the advantage of electric braking ?
AIt avoids wear of track
BMotor continues to remain loaded during braking
CIt is instantaneous
DMore heat is generated during braking