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DSSSB Upcoming JE Vacancy 2022 Notification
DSSSB Upcoming JE Vacancy 2022 Notification: Delhi Subordinate Services Selection Board has announced 723 tentative vacancies for Junior Engineers and Assistant Engineers till 31st December 2022.
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.
