Engineering :: Theory of Machines

@ : Home > Mechanical Engineering > Theory of Machines

71.

The effect of creep in case of cross-belt drive is

A.	To increase the power transmitted	B.	To increase the speed of driven pulley
C.	(A) and (B) above together	D.	To reduce the speed of the driven pulley and consequently reduce the power output
E.	None of the above

72.

In a V-belt having B section may be used when the load to be transmitted is

73.

V belt having cross-section A is suitable for usual load of 5 HP. If 15 HP load is to be transmitted

A.	Drive system may be changed	B.	3 Vee belts using 3 groove pulley may be used
C.	Gear system may be adopted	D.	Toothed belts may be used
E.	Machine arrangement may be modified

74.

Can simple band brake be made self-energising type

A.	Yes	B.	Yes, but with few limitations
C.	Yes, but with require several modifications	D.	No
E.	Will not be economical

75.

The function of a governor is

A.	To control the engine speed	B.	To maintain the speed of engine constant
C.	To maintain constant piston speed of engine	D.	To maintain the speed of an engine within prescribed limits of varying load conditions
E.	None of the above

76.

Sensitiveness of a governor is

A.	The range of variation of engine speed	B.	The ratio of the maximum speed to minimum speed within the operating range
C.	The ratio of the difference between the maximum and mean speed to that of minimum to mean speed	D.	The ratio of the difference between the maximum and minimum equilibrium speed to the mean equilibrium speed
E.	None of the above

77.

Isochronism in a governor is desirable when

A.	The engine operatres at low speeds	B.	The engine operates at high speeds
C.	The engine operates at variable speeds	D.	One speed is desired to be kept for all loads
E.	One speed is desired under one load

78.

Which dynamometer will be most suitable for measuring the BHP of an automobile engine?

79.

Which one of the following is a transmission type dynamometer?

80.

The coefficient of friction between pulley and belt is reduced to half. If the initial ratio of tension in belt is 5, then the new value will be