Power Screws Multiple Choice Questions - Set 02 - ObjectiveBooks

Power Screws Multiple Choice Questions - Set 02

Practice Test: Question Set - 02


1. The maximum efficiency of square threaded power depends upon
    (A) Lead angle of screw
    (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?
    (A) Square threads
    (B) Trapezoidal threads
    (C) Buttress threads
    (D) V-threads

4. Multiple threads are used for
    (A) High efficiency
    (B) High mechanical advantage
    (C) Low efficiency for self-locking
    (D) High load carrying capacity

5. Which of the following screw thread is adaptable to split type nut?
    (A) Square threads
    (B) Trapezoidal threads
    (C) Buttress threads
    (D) V-threads

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? 
    (A) Square threads
    (B) Trapezoidal threads
    (C) Buttress threads
    (D) Both (A) and (B)

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

10. Power screws for transmission of power should have
    (A) High efficiency
    (B) Low efficiency
    (C) Self-locking characteristic
    (D) Over hauling characteristic

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