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# NHPC JE’21 ME: Daily Practices Quiz. 29-Sep-2021

## 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 29-Sep-2021

Quiz: Mechanical Engineering
Exam: NHPC JE
Topic: Miscellaneous

Each question carries 1 mark
Negative marking: 1/4 mark
Time: 6 Minutes

Q1. Body executing SHM while passing through mean position will have kinetic and
potential energies as follows
(a) Maximum, minimum
(b) Minimum, maximum
(c) Zero, maximum
(d) Maximum, maximum

Q2. Flank wear occurs on the
(a) Relief face of the tool
(b) Rake face
(c) Nose of the tool
(d) Cutting edge

Q3. Mathematically, strain is defined as deformation per unit __________
(a) Length
(b) Volume
(d) Area

Q4. What is the number of instantaneous centres of rotation for a 6-link mechanism?
(a) 4
(b) 6
(c) 12
(d) 15

Q5. What is the direction of the Coriolis component of acceleration in a slotted lever-crank mechanism?
(a) Along the sliding velocity vector
(b) along the direction of the crank
(c) Along a line rotated 90° from the sliding velocity vector in a direction opposite to the
angular velocity of the slotted lever
(d) Along a line rotated 90° from the sliding velocity vector in a direction same as that of
the angular velocity of the slotted lever.

Q6. The torque applied on a shaft to transmit 22 kW at 1500 r.p.m., given that the ultimate strength is 150 MPa and the factor of safety is 3, will nearly be
(a) 140 Nm
(b) 140 N-mm
(c) 140 KN-m
(d) 70 N-mm

### Solutions

S1. Ans.(a)
Sol. Body executing SHM while passing through mean position will have kinetic and
potential energies as follows maximum, minimum.

S2. Ans.(a)
Sol. Flank wear occurs on the Relief face of the tool.

S3. Ans.(a)
Sol. Mathematically, strain is defined as deformation per unit length or we can say that it is the ratio of change in length to original length represent by ϵ.
▭(ϵ=∆l/l)
S4. Ans.(d)
Sol. No.of I.C.R.=(n(n-1))/2=(6×5)/2=15

S5. Ans.(d)
Sol. The direction of the Coriolis component of acceleration in a slotted lever-crank mechanism is obtained by rotating a line through 90° from the sliding velocity vector in a direction same as that of the angular velocity of the slotted lever.

f=2ωV

S6. Ans.(d)
Sol.
P=2πNT/60
22000=(2×π×1500×T)/60
T=140 Nm

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