Related Questions

The maximum efficiency of a lifting machine is
A $$\frac{1}{{\text{m}}}$$
B $$\frac{{{\text{VR}}}}{{\text{m}}}$$
C $$\frac{{\text{m}}}{{{\text{VR}}}}$$
D $$\frac{1}{{{\text{mVR}}}}$$
The condilion for a lifting machine to be reversible is that its efficiency should be
A less than 50%
B more than 50%
C more than 66.67%
D equal to 100%
The mechanical advantage of a lifting machine is the ratio of
A Distance moved by effort to the distance moved by load
B Load lifted to the effort applied
C Output to the input
D All of the above
A machine P can print out one lakh books in 8 hours. Machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines are started at 9 A.M.While machine P is stopped at 11 A.M. and remaining two machines completed the work. Approximately at what at what time will the work time (to print one lakh books) be finished?
A 11.30 Am
B 12 Noon
C 12.30 Pm
D 11.35 am
A small factory with 3 machines has a job of stamping out a number of pan covers. The newest machine can do the job is 3 days, another machine can do it in 4 days, and the third machine can do it in 6 days. How many days will the factory take to do the job using all the machine?
A 1.333
B 4.333
C 6
D 13
A machine P can paint one lakh books in 8 hours; machine Q can print the same number of books in 10 hours while machine R can print them in 12 hours. All the machines started operating at 9 A. M. while machine P is stopped at 11 A. M. and the reamaining two machines completed the work. Approximately at what time will the work (to print one lakh books) be finished?
A 11:30 A. M
B 12:00 noon
C 12:30 P. M.
D 1:00 P. M.
Three years ago, a machine was bought for Tk 1,00,000. The installation cost was Tk 20,000. The machine was depreciated in a straight line method at 20% per year. At the end of the 3rd year, the machine was sold for Tk 46,000. What is the gain/loss from sale of this machine?
A gain of Tk 2,000
B gain of Tk 6.000
C loss of Tk 2,000
D loss of Tk 6,000
E None of these
The maximum mechanical advantage of a lifting machine is
A 1 + m
B 1 - m
C $$\frac{1}{{\text{m}}}$$
D m
The velocity ratio of an inclined plane of inclination ‘θ’ with horizontal for lifting a load is
A sin θ
B cos θ
C tan θ
D cosec θ
There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would
A Remain same
B Decrease
C Increase
D None of the above

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