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Which of the following statement is/are correct about square and trapezoidal
threads ?

i. Square and trapezoidal threads have more cross-sectional area than ‘V’
threads.

ii. Square and trapezoidal threads are more suitable to transmit motion or power
than ‘V’ threads.

iii. Square and trapezoidal threads are not used for fastening purposes.
A) Only i and iii B) Only ii and iii
C) Only i and ii D) All of the above (i, ii and iii)

Which of the following is the horizontal distance from a point on one thread to the
corresponding point on the adjacent thread measured parallel to the axis ?

A) Crest B) Root C) Pitch D) Flank

When a single helix is making a screw, it is called
A) Single start thread B) Multi-start threads
C) Knuckle thread D) Worm thread

Which of the following statement is/are correct about multi-start threads ?

i. In multi-start threads, the lead of the helix increased without increasing the
pitch.

1. Lead = Pitch x Number of starts in multi-start threads.

iii. A multi-start thread makes it possible to keep the depth of thread less and
provides a rapid axial movement of the screws.

A) Only i and iii B) Only ii and iii
C) Only i and ii D) All of the above (i, ii and iii)

Which of the following is the surface connecting the crest and the root of a thread ?
A) Depth of thread B) Flank
C) Clearance D) Helix

One kWh of energy equals nearly

A) 4186 J B) 860 kcal C) 735.5 W D) 1000 W

Induction watt hour meters are free from errors.

A) Frequency B) Creeping C) Phase D) Temperature
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