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What is the frame used in the standard frames?
Answer: c Explanation: The frame is a mechanical structure required to house a stator of given outside diameter. The frame also includes housing the bearings, end covers, terminal box and maximum length.
Answer: c
Explanation: The frame is a mechanical structure required to house a stator of given
outside diameter. The frame also includes housing the bearings, end covers, terminal
box and maximum length.
See lessHow can the variation in ratings be obtained?
Answer: b Explanation: The frame is a mechanical structure required to house a stator of given outside diameter, housing the bearings, end covers, terminal box and maximum length. The variation in the ratings can be obtained using alternative core lengths.
Answer: b
Explanation: The frame is a mechanical structure required to house a stator of given
outside diameter, housing the bearings, end covers, terminal box and maximum length.
The variation in the ratings can be obtained using alternative core lengths.
See lessWhat is the value of the alternative core lengths below which variation in rating can be obtained?
Answer: d Explanation: The variation in the ratings can be obtained using alternative core lengths. The value of the alternative core lengths below 0.5 * length or 0.7 * length provides the variation in the ratings.
Answer: d
Explanation: The variation in the ratings can be obtained using alternative core lengths.
The value of the alternative core lengths below 0.5 * length or 0.7 * length provides the
variation in the ratings.
See lessWhat is the range of the central heights used in the standard frames?
Answer: d Explanation: The modern motors of small and medium sizes are built with standard frame sizes as specified in IEC 72. The IEC 72 lists a coherent range of main dimensions with the central heights ranging between 56-1000 mm.
Answer: d
Explanation: The modern motors of small and medium sizes are built with standard
frame sizes as specified in IEC 72. The IEC 72 lists a coherent range of main
dimensions with the central heights ranging between 56-1000 mm.
See lessThe frame size is designated by a number which is its centre height expressed in mm.
Answer: a Explanation: The IEC 72 lists a coherent range of main dimensions with the central heights ranging between 56-1000 mm. The frame size is designated by a number which is its centre height expressed in mm. The frame designated 180 has a centre height of 180 mm.
Answer: a
Explanation: The IEC 72 lists a coherent range of main dimensions with the central
heights ranging between 56-1000 mm. The frame size is designated by a number which
is its centre height expressed in mm. The frame designated 180 has a centre height of
180 mm.
See lessWhen two vectors are perpendicular, their
Answer: a Explanation: Dot product of two perpendicular vectors is given by A.B = |a||b|cos 90, which is zero. Thus, dot product is zero and vectors are perpendicular.
Answer: a
Explanation: Dot product of two perpendicular vectors is given by A.B = |a||b|cos 90,
which is zero. Thus, dot product is zero and vectors are perpendicular.
See lessWhich of the following are not vector functions in Electromagnetics?
Answer: d Explanation: Since all the coordinates in electromagnetic are space coordinates, direction and magnitude both are important. Thus all functions are vector only.
Answer: d
Explanation: Since all the coordinates in electromagnetic are space coordinates,
direction and magnitude both are important. Thus all functions are vector only.
See lessThe fractional horsepower motors have efficiency of order of 98%.
Answer: b Explanation: The fractional horse power motors have efficiency of order of 60% or less. The large turbo-alternators have efficiency of order of 98% because efficiency increases with an increase in dimensions.
Answer: b
Explanation: The fractional horse power motors have efficiency of order of 60% or less.
The large turbo-alternators have efficiency of order of 98% because efficiency increases
with an increase in dimensions.
See lessWhat is the formula of the core length?
Answer: b Explanation: Core length is one of the factors used in the separation of D and L of the DC machines. It is the ratio of the pole length to the pole pitch.
Answer: b
Explanation: Core length is one of the factors used in the separation of D and L of the
DC machines. It is the ratio of the pole length to the pole pitch.
See lessWhat is the range of the ratio of the pole length to pole pitch?
Answer: b Explanation: The minimum value of the ratio of the pole length to pole pitch is 0.64. The maximum value of the ratio of the pole length to pole pitch is 0.72.
Answer: b
Explanation: The minimum value of the ratio of the pole length to pole pitch is 0.64. The
maximum value of the ratio of the pole length to pole pitch is 0.72.
See less