6. The supplemented pressure acting on piston ring against the liner is
provided by ______ pressure over the inner circumference of the piston
rings to seal the cylinder when the piston reciprocates.
(A) gas
(B) scavenging air
(C) fuel
(D) lubricating oil
10. This type of trap uses the pressure energy of steam to close the valve
which consists of a simple metal disc. What type of operated traps is above
description?
(A) Thermodynamic trap
(B) Thermostatic trap
(C) Vacuum trap
(D) Mechanical trap
12. Refrigerator is formed by a single vapor-compression system which
contains an operated cycle of four main elements. What element is operated
after compressor?
(A) Heater
(B) Evaporator
(C) Expansion valve
(D) Condenser
14. What equipment is used to relieve excess pressure in all pressure
vessels including evaporator and in steam, water, oil, and air line?
(A) Throttle valve
(B) Relief valve
(C) Globe valve
(D) Quick closing valve
36. In the two-stroke engine, each revolution of _____________ creates
one power or working stroke.
(A) the turning gear
(B) the compressor
(C) the crankshaft
(D) the turbo-charger