Are you guys looking for Mechanical Engineering MCQ Questions with Answers PDF Free Download as per Mechanical Engineering new exam pattern? You came to the right page. This may assist you to understand and check your knowledge about the Subjects. Students also can take a free test of the Multiple Choice Questions of Mechanical Engineering. Each question has four options followed by the right answer. These Mechanical Engineering MCQ Questions are selected supported by the newest exam pattern.
Q1. Low specific speed of a pump implies it is
(A) Centrifugal pump
(B) Mixed flow pump
(C) Axial flow pump
(D) None of the above
Answer: (A) Centrifugal pump
Q2. In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by
(A) Designing new impeller
(B) Trimming the impeller size to the required size by machining
(C) Not possible
(D) Some other alterations in the impeller
Answer: (B) Trimming the impeller size to the required size by machining
Q3. Specific speed for reaction turbines ranges from
(A) 0 to 4.5
(B) 10 to 100
(C) 80 to 200
(D) 250 to 300
Answer: (B) 10 to 100
Q4. Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of
(A) 39.2%
(B) 49.2%
(C) 68.8%
(D) 84.8%
Answer:(A) 39.2%
Q5. Saving of work done and power by fitting an air vessel to single acting reciprocating pump is of the order of
(A) 39.2%
(B) 49.2%
(C) 68.8%
(D) 84.8%
Answer: (D) 84.8%
Q6. The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is
(A) Slow speed with radial flow at outlet
(B) Medium speed with radial flow at outlet
(C) High speed with radial flow at outlet
(D) High speed with mixed flow at outlet
Answer: (D) High speed with mixed flow at outlet
Q7. Which of the following pump is preferred for flood control and irrigation applications?
(A) Centrifugal pump
(B) Axial flow pump
(C) Mixed flow pump
(D) Reciprocating pump
Answer: (B) Axial flow pump
Q8. Which of the following statement is correct as regard to water wheels?
(A) They have slow speeds
(B) They are suitable even for low water heads
(C) They give constant efficiency, even if the discharge is not constant
(D) All of the above
Answer: (D) All of the above
Q9. In a Kaplan turbine runner, the numbers of blades are generally between
(A) 2 to 4
(B) 4 to 8
(C) 8 to 16
(D) 16 to 24
Answer: (B) 4 to 8
Q10. The unit speed of the turbine runner is
(A) N/√H
(B) N/H
(C) N/H3/2
(D) N/H²
Answer: (A) N/√H
Q11. The discharge of a double acting reciprocating pump is (where L = Length of stroke, A = Cross-sectional area of piston, and N = Speed of crank in r.p.m.)
(A) L.A.N
(B) 2 L.A.N
(C) (L.A.N)/60
(D) (2 L.A.N)/60
Answer: (D) (2 L.A.N)/60
Q12. Which of the following pump is successfully used for lifting water from deep wells?
(A) Centrifugal pump
(B) Reciprocating pump
(C) Jet pump
(D) Air lift pump
Answer: (D) Air lift pump
Q13. Head developed by a centrifugal pump is
(A) Proportional to diameter of impeller
(B) Proportional to speed of impeller
(C) Proportional to diameter and speed of impeller
(D) None of the above
Answer: (C) Proportional to diameter and speed of impeller
Q14. Which of the following pump is successfully used for lifting water to the turbines?
(A) Centrifugal pump
(B) Reciprocating pump
(C) Jet pump
(D) Air lift pump
Answer: (C) Jet pump
Q15. The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship is given by
(A) [2(Vr – v) v]/ Vr²
(B) [2(Vr + v) v]/ Vr²
(C) [(Vr – v) v]/ Vr
(D) [(Vr + v) v]/ Vr
Answer: (A) [2(Vr – v) v]/ Vr²
Q16. If the net positive suction head (NPSH) requirement for the pump is not satisfied, then
(A) No flow will take place
(B) Cavitation will be formed
(C) Efficiency will be low
(D) Excessive power will be consumed
Answer: (B) Cavitation will be formed
Q17. Overall efficiency of a centrifugal pump is the ratio of
(A) Energy available at the impeller to the energy supplied to the pump by the prime mover
(B) Actual work-done by the pump to the energy supplied to the pump by the prime mover
(C) Energy supplied to the pump to the energy available at the impeller
(D) Manometric head to the energy supplied by the impeller per kN of water
Answer: (B) Actual work-done by the pump to the energy supplied to the pump by the prime mover
Q18. Reaction turbines are used for
(A) Low head
(B) High head
(C) High head and low discharge
(D) Low head and high discharge
Answer: (D) Low head and high discharge
Q19. Multistage centrifugal pumps are used to
(A) Give high discharge
(B) Produce high heads
(C) Pump viscous fluids
(D) All of these
Answer: (B) Produce high heads
Q20. The unit power developed by a turbine is (where P = Power developed by the turbine under a head of water (H).
(A) P/ √H
(B) P/ H
(C) P/ H3/2
(D) P/ H²
Answer: (C) P/ H3/2
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