Machine Drawing Mcqs

Q:

How to specify metric thread with major diameter 45mm, 2mm pitch, grade 7, tolerance grade h (internal thread), right hand double start threaded profile?

A) M 45*2-7-H-RH-DOUBLE B) M 45*2-7-h-RH-DOUBLE
C) M 45*2-7-H-LH-DOUBLE D) M 45*7-2-H-RH-DOUBLE
 
Answer & Explanation Answer: A) M 45*2-7-H-RH-DOUBLE

Explanation: None.

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16
Q:

If a thread is specified as ‘M 16*1.5 8 g LH DOUBLE’, g stands for ____________

A) type of pitch – coarse B) grade
C) tolerance D) hand of the helix
 
Answer & Explanation Answer: C) tolerance

Explanation: In a given thread specification g is used for tolerance. It is in lower case, representing external threads. If it is in upper case (G), it will be representing internal threads.

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21
Q:

If not specified, a left hand, single start thread of usual tolerance and grade is presumed.

A) True B) False
 
Answer & Explanation Answer: B) False

Explanation: Threads are specified by type of thread profile, major diameter, tolerance, hand of helix and start of threads. If not specified, a right hand, single start thread of usual tolerance and grade is presumed.

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17
Q:

Which thread is denoted by SQ 40*10?

A) Square thread with 40mm major diameter and 10mm pitch B) Square thread with 10mm major diameter and 40mm pitch
C) Metric thread with 40mm major diameter and 10mm pitch D) Square thread with 40mm minor diameter and 10mm pitch
 
Answer & Explanation Answer: A) Square thread with 40mm major diameter and 10mm pitch

Explanation: If a thread is not a metric thread, type of thread is given in abbreviated form. Square thread is abbreviated as SQ. 40*10 denotes 40mm major diameter and 10mm pitch.

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22
Q:

What do you mean by M10?

A) Metric thread with a major diameter of 10.00mm and fine pitch B) Metric thread with a major diameter of 10.00mm and coarse pitch
C) Metric thread with a major diameter of 10.00cm and fine pitch D) Metric thread with a minor diameter of 10.00mm and coarse pitch
 
Answer & Explanation Answer: B) Metric thread with a major diameter of 10.00mm and coarse pitch

Explanation: M denotes metric thread. 10 followed by M denotes a major diameter of thread in mm. here, pitch is not defined. So, it is taken as a coarse pitch thread.

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20
Q:

A metric thread is designated by _________

A) its profile of the groove B) letter M
C) its hand of the helix D) thread profile
 
Answer & Explanation Answer: B) letter M

Explanation: A metric thread is designated by letter M. It is then followed by major diameter in mm followed by the pitch with an ‘x’ sign in between the diameter and pitch. Coarse pitch is considered if the pitch is not defined.

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74
Q:

__________ is the slight improvement over square thread.

A) Buttress thread B) Knuckle thread
C) Acme thread D) BSW thread
 
Answer & Explanation Answer: C) Acme thread

Explanation: An acme thread is a slight improvement over square thread. Sides of the acme thread are inclined at 14.50. Square thread is difficult to cut because a parallel surface of both flanks and hence acme thread are used instead at some places.

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16
Q:

Square threads are used for ________

A) power transmission B) clamping devices
C) easy operation of engagement and disengagement D) fastening purpose
 
Answer & Explanation Answer: A) power transmission

Explanation: Square thread is the simple and strong type of thread profile. It is used for power transmission. Its width and depth are equal to the half of the pitch.

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