An epicyclic gear train has 3 shafts A,B and C. A is an input shaft running at 100 r.p.m. clockwise. B is an output shaft running at 250 r.p.m. clockwise. Torque on a is 50 kNm. C is a fixed shaft. The torque to fix C

cannot be determined as the data is insufficient

Match list I with list II

A. Compound train 1. Hart mechanism

B. Quick return mechanism 2. Coriolis force

C. Exact straight line motion 3. Transmission of motion around bends and corners

D. Approximate straight line motion 4. Watt mechanism

Pressure angle of involute gears does not exceed 250, since

this will lead to unwanted radial force

the number of teeth to avoid undercutting will be very high

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1.	An epicyclic gear train has 3 shafts A,B and C. A is an input shaft running at 100 r.p.m. clockwise. B is an output shaft running at 250 r.p.m. clockwise. Torque on a is 50 kNm. C is a fixed shaft. The torque to fix C
A.	is 20 kNm anticlockwise
B.	is 30 kNm anticlockwise
C.	is 30 kNm clockwise
D.	cannot be determined as the data is insufficient
Answer» B. is 30 kNm anticlockwise

Discussion

2.	Match list I with list II
A.	List I List II
B.	A. Compound train 1. Hart mechanism
C.	B. Quick return mechanism 2. Coriolis force
D.	C. Exact straight line motion 3. Transmission of motion around bends and corners
E.	D. Approximate straight line motion 4. Watt mechanism
Answer» C. B. Quick return mechanism 2. Coriolis force

Discussion

3.	Pressure angle of involute gears does not exceed 250, since
A.	this will lead to unwanted radial force
B.	the number of teeth to avoid undercutting will be very high
C.	no cutters are available
D.	gear will become too small
Answer» B. the number of teeth to avoid undercutting will be very high

Discussion