NHPC JE Recruitment 2021
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NHPC-JE’21 ME: Daily Practices Quiz
NHPC-JE’21 ME: Daily Practices Quiz 28-Sep-2021
Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: TOM
Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes
Q1. The mechanism which is an exact straight-line mechanism using lower pairs?
(a) Watt’s mechanism
(b) Grasshopper mechanism
(c) Robert’s mechanism
(d) Peaucellier’s mechanism
Q2. In a mechanism having 8 links, the number of instantaneous centres of rotation present are
(a) 28
(b) 56
(c) 15
(d) 0
Q3. A football is rolling on ground, the motion of any point on its surface is
(a) elliptical plane motion
(b) helical
(c) spherical
(d) plane rotation
Q4. Klein’s diagram is used to find
(a) Angular velocity of various parts
(b) Velocity of various parts
(c) Acceleration of various parts
(d) Velocity and acceleration of various parts
Q5. Which of the following is not the shape of Cam?
(a) Spiral
(b) Knife-edge
(c) Globoidal
(d) Conjugate
Q6. In elliptical trammels
(a) All four pairs are sliding
(b) All four pairs are turning
(c) Two pairs are turning and other two sliding
(d) One pair turning and three sliding
Solutions
S1. Ans. (d)
Sol. Peaucellier’s mechanism is an exact straight-line mechanism using lower pairs
S2. Ans. (a)
Sol. Center of rotation =C_2^8=(8×7)/2=28
S3. Ans. (c)
Sol. Spherical
S4. Ans. (d)
Sol. Klein’s diagram is used to find velocity and acceleration of various parts of single slider crank mechanism.
S5. Ans. (b)
Sol. Spiral, globoidal, conjugate and spherical are shape of cam whereas knife-edge is the shape of follower in cam-follower mechanism.
S6. Ans. (c)
Sol. Elliptical Trammel is an inversion of double crank chain mechanism. A double slider crank chain consists of four links forming two sliding pairs and turning pairs.
