Standard Frames MCQs : This section focuses on the "Standard Frames". These Multiple Choice Questions (MCQs) should be practiced to improve the Standard Frames skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
How can the variation in ratings be obtained?
A. alternative windings
B. alternative core lengths
C. alternative pole pitch
D. alternative pole length
Question 2
The core length should be high to obtain high short circuit ratio.
A. true
B. false
Question 3
The frame size is designated by a number which is its centre height expressed in mm.
A. true
B. false
Question 4
What is the factor which is by modern motors which are into a series of standard frames?
A. current rating
B. voltage rating
C. power rating
D. output rating
Question 5
What is the frame used in the standard frames?
A. set of standard values
B. mechanical structure required to house a rotor of given outside diameter
C. mechanical structure required to house a stator of given outside diameter
D. mechanical structure required to house a stator of given outside length
Question 6
What is the maximum value of the peripheral speed that should not exceed?
A. 25 m per sec
B. 20 m per sec
C. 30 m per sec
D. 35 m per sec
Question 7
What is the range of the central heights used in the standard frames?
A. 50-1000 mm
B. 90-1000 mm
C. 100-1000 mm
D. 56-1000 mm
Question 8
What is the range of the pole length to pole pitch ratio for obtaining good power factor in induction motors?
A. 1.5-2
B. 1.3–1.8
C. 1.0-1.25
D. 1.1-1.6
Question 9
What is the range of the ratio of the pole length to pole pitch?
A. 0.60-0.70
B. 0.64-0.72
C. 0.65-0.75
D. 0.70-0.80
Question 10
What is the relationship between the diameter and number of poles?
A. diameter is directly proportional to the number of poles
B. diameter is indirectly proportional to the number of poles
C. diameter is directly proportional to the square of the number of poles
D. diameter is indirectly proportional to the square of the number of poles
Question 11
What is the value of the alternative core lengths below which variation in rating can be obtained?
A. 0.7 * length
B. 0.4 * length
C. 0.3 * length
D. 0.7 * length or 0.5 * length
Question 12
What is the formula of the core length?
A. core length = pole length * pole pitch
B. core length = pole length / pole pitch
C. core length = pole length + pole pitch
D. core length = pole length – pole pitch