Top 550+ Solved Machine Design MCQ Questions Answer
Q. For which of the following gear material the noise level is relatively low?
a. Non-ferrous materials
b. Grade cast iron
c. Non-matallic material
d. Porous materials
e. Alloy steels
Q. The assumption of bi-linearly idealised stress-strain relationship for plastic analysis and design is used for
a. steel structures
b. Increasing the diameter of threaded portion
c. prestressed concrete structures
d. reinforced concrete structures
e. aluminium structures
Q. V-belt sections generally used in an automobiles are
a. A and B
b. C
c. D
d. E
e. Any one of the above
Q. The maximum size of the fillet weld that can be applied to the toe of an angle or the round edge should be
a. 1.5 mm less than the thickness of the plate
b. Increasing the diameter of threaded portion
c. equal to the thickness of the plate
d. 0.75 times the thickness of the plate
e. 1.5 mm more than the thickness of the plate
Q. If M 20 coarse pitch is 2.5 mm the mm the fine pitch for the size would be
a. 10 mm
b. 5 mm
c. 2.5 mm
d. 1.5 mm
e. None of the above
Q. The form coefficient of a spring is
a. Dynamic load carrying capacity
b. It capability to store energy
c. The load/unit drflection
d. Load/spring area
e. Ratio of coil diameter to wire diameter
Q. The balls in a ball bearing remain in position
a. Due to centrifugal force
b. In a cage
c. Due to dead load on bearing
d. By lubricant
e. Automatically
Q. Which of the following has highest strength to weight ratio?
a. Alloy steel, heat treated
b. Brass
c. Stainless steel
d. Steel piano wire
e. Aluminium, hard rolled
Q. Maximum gear ratio in case of single mesh spur gears is expected to be around
a. 150
b. 50
c. 80
d. 10
e. 100
Q. In elevated circular steel tanks, hemispherical bottoms are preferred because
a. large capacity
b. better appearance
c. riveted connection between the side and bottom plates are easy
d. All of the above
e. Increasing the diameter of threaded portion
Q. Stretching on a belt can be controlled by
a. decreasing belt length
b. decreasing stress in the belt
c. decreasing belt velocity
d. none of the above
e. Cast steel
Q. The number of plastic hinges necessary to convert a framed structure into a mechanism is (r is degree of redundancy of the structure)
a. r - 1
b. r + 1
c. 2r + 1
d. 2r - 1
e. Increasing the diameter of threaded portion
Q. The surface hardness that can be obtained by nitriding is generally in the range
a. 800 - 1000 VPN
b. Below 400 VPN
c. 1000 - 1100 VPN
d. 600 - 800 VPN
e. 400 - 600 VPN
Q. A circulating water pump of a condenser is of the centrifugal type and directly connected to a three phase induction motor running at 900 rpm. The pump delivers 30,000 litres per minute against the dynamic head of 10 m. The horse power of the motor required to drive the pump would be
a. 40-50 HP
b. 50-60 HP
c. 60-70 HP
d. 30-40 HP
e. 20-30 HP