Power Screws Multiple Choice Questions - Set 02 - ObjectiveBooks
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# Practice Test: Question Set - 02

1. The maximum efficiency of square threaded power depends upon
(B) Friction angle
(C) Pitch of screw
(D) Nominal diameter of screw

2. For over hauling screw
(A) φ > α
(B) α > φ
(C) φ = α
(D) None of the above

3. Which of the following screw thread is stronger than other threads?

4. Multiple threads are used for
(A) High efficiency
(C) Low efficiency for self-locking

5. Which of the following screw thread is adaptable to split type nut?

6. The efficiency of square threaded power screw is given by,
(A) η = tan α/tan (α + φ)
(B) η = tan α/tan (α - φ)
(C) η = tan (α + φ)/tan α
(D) η = tan (α - φ)/tan α

7. For self locking screw
(A) φ > α
(B) α > φ
(C) μ < tan α
(D) μ = cosec α

8. Which of the following screw thread is used for transmitting power in either direction?
(D) Both (A) and (B)

9. A cup is provided in screw jack
(A) To reduce the friction
(B) To prevent rotation of load