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# NHPC JE’21 ME: Daily Practices Quiz. 28-Sep-2021

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## NHPC JE Recruitment 2021

National Hydroelectric Power Corporation (NHPC) has released the recruitment notification for engagement of following posts such as Senior Medical Officer, Assistant Rajbhasha Officer, Junior Engineer & Sr. Accountant posts. NHPC expects application from High Performing, Dynamic & Achievement-Oriented Professionals candidates to fill up these 173 vacancies.

### 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.

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## Published by VINAYAK KUMAR

Graduated from BIT Sindri, Postgraduated from IIT BHU Varanasi

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