Multiple choice general knowledge science & technology

Quick return mechanism is an inversion of

  1. a)four bar chain

  2. b)single slider crank chain

  3. c)double slider crank chain

  4. d)crossed slider crank chain
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The quick return mechanism (e.g., Whitworth quick return or crank slotted lever mechanism) is obtained by fixing different links of a single slider crank chain. When the sliding link is fixed, it converts rotary motion into reciprocating motion with different forward and return stroke times. Four bar chain inversions produce different mechanisms like drag link coupling, while double slider crank gives elliptical trammel.

AI explanation

To answer this question, you need to understand the concept of a quick return mechanism.

A quick return mechanism is a mechanism that converts rotary motion into reciprocating motion, where the return stroke is faster than the forward stroke. It is commonly used in machines such as shapers and slotting machines.

Now let's go through each option to understand why it is correct or incorrect:

Option A) Four bar chain - This option is incorrect because a four bar chain is a mechanism that consists of four links connected by revolute joints. It does not involve the conversion of rotary motion into reciprocating motion.

Option B) Single slider crank chain - This option is correct because a quick return mechanism is indeed an inversion of a single slider crank chain. In a single slider crank chain, a crank is connected to a slider, and the rotary motion of the crank is converted into reciprocating motion of the slider. In a quick return mechanism, the length of the connecting rod is such that the return stroke is faster than the forward stroke.

Option C) Double slider crank chain - This option is incorrect because a double slider crank chain is a mechanism that consists of two sliders connected by a crank. It does not involve the conversion of rotary motion into reciprocating motion.

Option D) Crossed slider crank chain - This option is incorrect because a crossed slider crank chain is a mechanism that consists of two sliders connected by a crank, where the sliders move in opposite directions. It does not involve the conversion of rotary motion into reciprocating motion.

Therefore, the correct answer is option B) Single slider crank chain. This option is correct because a quick return mechanism is an inversion of a single slider crank chain.

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