Related Questions

The speed of a universal motor is generally reduced by using
A gear trains
B V-belts
C brakes
D chains
a motor -cycle covers 40 Km with a speed of 20 km /hr. Find the speed of the motor -cycle for the next 40 km journey so that the average speed of the whole journey will be 30 km / hr.
A 70.0km /hr
B 52.5km /hr
C 60.0km/hr
D 60. 5 km / hr
A motor cycle covers 40 km with a speed of 20 km/hr. Find the speed of the motor cycle for the next 40 km journy so that the average speed of the whole journey will be 30 km/hr?
A 70
B 52.5
C 60
D 60.5
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
A Compressibility
B Molecular weight
C Humidity
D None of these
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints
A Absorb the vibrations transferred from the surface of the road
B Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
C Absorb any difference in speed between the left and right wheels when the vehicle is turning
D None of the above
In case of high speed universal motor which of the following needs more attention ?
A End play
B Air gap
C Insulation in rotor
D Balancing of rotor
The speed control of universal motor used for sewing machines is by
A friction
B varying the resistance
C tapping the field
D centrifugal mechanism
Speed control of a universal motor is achieved by
A Varying field flux with tapped field windings
B Connecting rheostat in series
C Applying variable voltage by means of silicon controlled rectifier
D All of the above methods
The speed/load characteristics of a universal motor is same as that of
A D.C. motor
B D.C. shunt motor
C D.series motor
D none of the above
Size of a high speed motor as compared to low speed motor for the same H.P. will be
A Bigger
B Smaller
C Same
D Any of the above

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