Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
The work done of vectors force F and distance d, separated by angle θ can be calculated using,
Answer: b Explanation: Force is a vector quantity, whereas distance is scalar. Work is defined as the product of force and distance, which is given by dot product.
Answer: b
See lessExplanation: Force is a vector quantity, whereas distance is scalar. Work is defined as
the product of force and distance, which is given by dot product.
The cross product of the vectors 3i + 4j – 5k and –i + j – 2k is,
Answer: b Explanation: Cross product of two vectors is, A X B = (a2*b3 – b2*a3)i – (a1*b3 – b1*a3)j + (a1*b2 – b1*a2)k. Using the formula, the answer can be calculated.
Answer: b
See lessExplanation: Cross product of two vectors is, A X B = (a2*b3 – b2*a3)i – (a1*b3 –
b1*a3)j + (a1*b2 – b1*a2)k. Using the formula, the answer can be calculated.
When 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 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
See lessExplanation: 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.
What 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
See lessExplanation: 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.
What 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
See lessExplanation: 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.
How 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
See lessExplanation: 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.
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
See lessExplanation: 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.
What is the factor which is by modern motors which are into a series of standard frames?
Answer: c Explanation: The modern motors for industrial applications is concentrated into a series of standard frames. The standard frames are used to cover a wide range of power ratings.
Answer: c
See lessExplanation: The modern motors for industrial applications is concentrated into a series of standard frames. The standard frames are used to cover a wide range of power ratings.
The core length should be high to obtain high short circuit ratio.
Answer: a Explanation: The core length is directly proportional to the short circuit ratio. If high short circuit ratio is required, high core length should be used.
Answer: a
See lessExplanation: The core length is directly proportional to the short circuit ratio. If high short circuit ratio is required, high core length should be used.