A simple ac amplifier may be used to amplify dc input through use of an additional circuit component known as
A.tuned amplifier
B.carrier
C.chopper
D.None of the above
Category: Mechanical Engineering Mcqs
Cast iron containing 6.6% carbon is
A.Black in colour containing only pearlite
B.Black in colour containing only ferrite
C.Gray in colour containing pearite and ferrite only
D.Whitish containing cementite only
E.None of the above
The present value of a Rs. 100 payable one year from today its
A.Rs. 100
B.Rs. 105 if the interest rate is 5%
C.Rs. 110 if the interest rate is 10%
D.Rs. 95 if the interest rate is 5%
E.None of the above
In a reheating gas turbine cycle, reheating is done
A.by gases from turbine exhaust
B.by gases from intercooler
C.in separate combustion chamber
D.any of the above
The advantage of electronically operated automatic control system is
A.Needs no maintenance
B.Can be located in hazardous locations
C.Does not cost much
D.Does not require skilled service personnel
E.No time lags, no transmission delays
A refrigerant is added to vapour compression cycle through
A.High side in vapour form
B.High side in liquid form
C.Low side in liquid form
D.None of the above
Investment casting is also known as
A.lost wax casting
B.lost pattern casting
C.hot investment casting
D.any of the above
Which of the following metal has the lowest specific gravity?
A.Monal metal
B.Magnesium
C.Copper
D.Bronze
E.Cast iron
Lowest pouring temperature alloy is
A.Tin bronze
B.Phosphor bronze
C.Monel metal
D.Cupro nickel alloy
During adiabatic expansion which of the following remains constant:
A.Internal energy
B.Temperature
C.Entropy
D.None of the above
