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Engineering :: Machine Design


81.  A bushed pin flexible type coupling is used to join two shafts which
A. Are not in exact alignment B. Are not coplanar
C. Change position during operation D. Are inclined
E. None of the above    

82.  A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at
A. End points B. Middle of span
C. Anywhere along the span D. Case should be analysed for various positions of load along the span
E. Data should be taken from hand books    

83.  The trunions of a mixing machine have an effective length of 30 cm and the weight coming on each trunion is 1250 kg. If the fibre stress is not to exceed 350 kg/sq-cm the diameter of the trunions should be
A. 4 cm B. 6 cm
C. 8 cm D. 10 cm
E. 12 cm    

84.  A circulating water pump of a condenser is of the centrifugal type and directly connected to a three phase induction motor running at 900 rpm. The pump delivers 30,000 litres per minute against the dynamic head of 10 m. The horse power of the motor required to drive the pump would be
A. 20-30 HP B. 30-40 HP
C. 40-50 HP D. 50-60 HP
E. 60-70 HP    

85.  As per Indian Boilers regulations the type of joint preferred for longitudinal joint is
A. Welded joint B. Welded joint with cover plate
C. Riveted lap joint D. Reveted butt joint
E. Any of above    

86.  As per Indian Boilers Regulations the type of joint preferred for circumferential joints is
A. Welded joint B. Welded joint with cover plate
C. Riveted lap joint D. Reveted butt joint
E. Any of above    

87.  If during operation of a boiler one of the riveted joints is found leaking
A. The boiler is stopped immediately B. All the riveted joints are reopened and gain riveted
C. Depending upon the zone of boiler in which the joint leaks, decision is taken D. The joint is repaired if in low pressure zones otherwise boiler sent for repairs
E. None of the above    

88.  Hydraulic testing of boilers is done at pressures
A. Below and above atmosphere B. Slightly above atmospheric pressure
C. At half the working pressure of boiler D. At working pressure of boiler
E. At 1    

89.  If during operation a boiler bursts, the matter should be reported to
A. Management B. Police
C. State Government D. Central Government
E. Boiler inspector    

90.  The holes in plates for reveting are usually made by
A. Arc cutting B. Oxyacetylene flame
C. Punching D. Drilling
E. Any of the above    




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