What is the basic sequence of operation of the key /bar type writer:
A. The typist strikes the key on the keyboard
B. The ribbon transfers the impression to the sheet of paper behind it and the platen absorbs the force of the strike
C. As the key bar falls back into place, the carriage usually moves one unit to the next typing space and ribbon advances
D. The type block strikes the ribbon
E. Through mechanical linkage or electric triggering, a type bar is thrown up from the type basket towards the platen
Choose the correct answer from the options given below:
Understanding Key Bar Typewriter Operation
A key bar typewriter operates through a precise mechanical sequence initiated by the typist. Understanding this sequence helps clarify how each character gets printed onto paper.
Step-by-Step Typewriter Sequence Explanation
Let's break down the operation based on the provided steps:
- A. The typist strikes the key on the keyboard: This is the starting point. When a typist presses a key, it initiates the entire printing process.
- E. Through mechanical linkage or electric triggering, a type bar is thrown up from the type basket towards the platen: The force from striking the key activates a mechanism. This mechanism causes the corresponding type bar, which holds the character, to swing upwards rapidly towards the paper.
- D. The type block strikes the ribbon: As the type bar reaches the end of its motion, the character (type block) at its tip strikes the ink-soaked ribbon that is positioned between the type bar and the paper.
- B. The ribbon transfers the impression to the sheet of paper behind it and the platen absorbs the force of the strike: The impact forces the ink from the ribbon onto the paper. The platen, a rubber roller behind the paper, provides a firm surface and absorbs the force of the type block's strike, ensuring a clear impression.
- C. As the key bar falls back into place, the carriage usually moves one unit to the next typing space and ribbon advances: After striking the ribbon, the type bar falls back to its resting position. Simultaneously, the carriage holding the paper shifts horizontally, typically by one character space, preparing the machine for the next keystroke. The ribbon mechanism also advances slightly to present a fresh section of ink for the next strike.
The Correct Operational Order
Based on this detailed explanation, the correct sequence of operation for a key bar typewriter is:
A (Strike key) -> E (Type bar thrown) -> D (Type block hits ribbon) -> B (Impression transferred, platen absorbs) -> C (Key bar returns, carriage moves).
Therefore, the sequence A, E, D, B, C accurately describes the basic operation.
Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
