Top 350+ Solved Heat Engines MCQ Questions Answer
Q. If engines of different horse power, rpm, cylinder dimensions are to be compared for their performance, the parameter of comparison could be
a. Mean effective pressure
b. Specific speed
c. Exhaust temperature
d. Fuel consumption
e. Unit speed
Q. Ambassador car engine is
a. F-type
b. Overhead valve type
c. Side valve type
d. L-type
e. Overhead inlet and side exhaust type
Q. Which of the following chemical acts as anti-freeze?
a. Naphtha
b. Glycol
c. Ethyl alcohol
d. Lead acetate
e. n-heptane
Q. A low pressure accumulator is generally used with which of the following turbine
a. Mixed pressure turbine
b. Back pressure turbine
c. Impulse turbine
d. Condensing turbine
e. Reaction turbine
Q. Which is not the cause for loss of heat in boiler due to incomplete combustion?
a. Under cooling of furnace at low ratings
b. Improper secting of boiler
c. Insufficient air supply
d. Boiler drum uninsulated
e. Fuel bend in proof condition
Q. Temporary hardness of water is caused by
a. Bicarbonates of calcium and magnesium
b. Sulphates of calcium and magnesium
c. Chlorides of calcium and magnesium
d. Nitrates of calcium and magnesium
e. None of the above
Q. Crankcase explosion occurs in
a. Four stroke SI engines
b. Four stroke Cl engines
c. Two stroke Cl engines
d. Gas engines
e. Two stroke SI engines
Q. Which of the following offers best resistance to knocking in S.I. engines?
a. Aromatics
b. Paraffins
c. Carbon dioxide
d. Naphthenes
e. Olefins
Q. Which of the following engine can work on very lean mixture?
a. Petrol engine
b. Diesel engine
c. Two stroke engine
d. Wankel engine
e. Four stroke engine
Q. Overall thermal efficiency of a thermal power plant is
a. Carnot cycle efficiency
b. 50 to 70% of theoretical efficiency
c. Product of boiler efficiency, turbine efficiency and generator efficiency
d. Rankine cycle efficiency
e. None of the above
Q. In gas and petrol engines thermal efficiency may be expected in the range
a. 50 percent
b. 30 to 35 percent
c. 10 - 15 percent
d. 15 to 25 percent
e. 60 percent
Q. A 200 MW generator should be cooled by
a. Nitrogen
b. Hydrogen peroxide
c. Hydrogen
d. Water
e. Air
Q. Which of the following exists as highest pressure in a diesel engine
a. Exhaust gases in silencer
b. Lubricating oil
c. Fuel at the time of injection
d. Air at the end of compression stroke
e. Air during suction
Q. A camshaft is not provided in case of
a. Two stroke engines
b. High speed engines
c. Multicylinder engines
d. ir cooled engines
e. Vertical engines