371) Which of the following statement is correct regarding power screws?
Answer is:
The efficiency of a self locking screw can not be more than 50% and The efficiency of Acme (trapezoidal) thread is less than that of a square thread
Related Machine Design MCQ with Answers
Answer is:
greater
Answer is:
upper deviation
Explanation:
Algebraic difference between a size and a corresponding basic size is called deviation. Limit deviations are upper and lower deviations. Algebraic difference of actual size with basic size is called actual deviation.
Upper Deviation: It is the algebraic difference between the maximum size and the basic size.
The upper deviation of a hole is represented by a symbol ES (Ecart Superior) and of a shaft, it is represented by es.
Lower Deviation: It is the algebraic difference between the minimum size and the basic size.
The lower deviation of a hole is represented by a symbol EI (Ecart Inferior) and of a shaft, it is represented by ei.
Answer is: