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DSSSB-JE/AE’21 EE: Daily Practices Quiz 29-Dec-2021

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DSSSB-JE/AE’21 QUIZ: ELECTRICAL ENGG.

DSSSB-JE/AE’21 EE: Daily Practices Quiz 29-Dec-2021
Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min

Q1. Operation of stepping motors at high speeds is called……………
(a) Inching
(b) Jogging
(c) Fast forward
(d) Slewing

Q2. When the supply voltage to an induction motor is reduced by 10 %, the maximum torque will be decreased approximately by:
(a) 5 %
(b) 10 %
(c) 19 %
(d) 40 %

Q3. Choose the characteristics which is not related to an ideal op-amp?
(a) Very high gain
(b) Very high input impedance
(c) Very low output impedance
(d) Very low CMRR

Q4. What is the unit of reciprocal of reluctance?
(a) Henry
(b) Henry/ meter
(c) Meter/Henry
(d) Henry^(-1)

Q5. Which of the following motor is non-self-starting?
(a) Squirrel cage induction motor
(b) Slip ring induction motor
(c) Synchronous motor
(d) DC series motor

Q6. Kirchhoff’s voltage law is based on-
(a) Law of conservation of energy
(b) Law of conservation of charge
(c) Both a and b
(d) None

SOLUTIONS

S1. Ans.(d)
Sol. A stepper motor operates at high speeds is called as slewing.

S2. Ans.(c)
Sol. For an induction motor: T ⍺ E_2^2
∴T_2/T_1 =(0.9 E_2 )^2/(E_2^2 )
⇒T_2=0.81 T_1
So, torque decreased by 19 %.

S3. Ans.(d)
Sol. Ideal op-amp have high input impedance, low output impedance and high gain.

S4. Ans.(a)
Sol. permeance=1/reluctance
Unit: The units of permeance are Weber per ampere-turns (Wb/AT) or Henry.

S5. Ans.(c)
Sol. Synchronous motor is non-self-starting.

S6. Ans.(a)
Sol.
KVL is based on conservation of energy.
KCL is based on conservation of Charge.

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