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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