Spring index is___________________?
(A) ratio of coil diameter to wire diameter
(B) load required to produce unit deflection
(C) its capability of storing energy
(D) indication of quality of spring
(D) nothing
Form coefficient of spring is _____________________?
(A) ratio of coil diameter to wire diameter
(B) load required to produce unit deflection
(C) its capability of storing energy
(D) concerned With strength of wire of spring
(D) nothing
When two springs are in series (having stiffness K), the equivalent stiffness will be________________?
(A) K
(B) K/2
(C) 2K
(D) KIA
(D) UK
If a spring is cut down into two springs, the stiffness of cut springs will be _________________?
(A) half
(B) same
(C) double
(D) unpredictable
(D) none of the above
Aircraft body is usually fabricated by_________________?
(A) welding
(B) precasting
(C) rivetting
(D) casting
(D) unconventional methods
In hydrodynamic bearings_____________________?
(A) the oil film pressure is generated only by the rotation of the journal
(B) the oil film is maintained by supplying oil under pressure
(C) do not require external supply of lubricant
(D) grease is used for lubrication
(D) none of the above
If p = bearing pressure on projected bearing area, z = absolute viscosity of lubricant, and N = speed of journal, then the bearing characteristic number is given by________________?
(A) ZN/p
(B) p/ZN
(C) Z/pN
(D) N/Zp
(D) Zp/N
Turn buckle has____________________?
(A) right hand threads on bout ends
(B) left hand threads on both ends
(C) left hand threads on one end and right hand threads on other end
(D) no threads
(D) threads in middle portion
Elastic nut is a locking device in which__________________?
(A) one small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
(B) a slot is cut partly in middle of nut and then slot reduced by tightening a screw
(C) hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip
(D) through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end
(D) none of the above
If threads on a bolt are left hand, threads on nut will be_____________________?
(A) right hand with same pitch
(B) left hand with same pitch
(C) could be left or right hand
(D) right hand with fine pitch
(D) left hand with fine pitch