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SSC JE 2017: Electrical Machines Rankers Quiz 4
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Question 1
Two d.c. series motors connected in series draw current I from supply and run at speed N. When the same two motors are connected in parallel taking current I from the supply, the speed of each motor will be:
Question 2
If the supply polarity to the armature terminals of a separately excited d.c. motor is reversed, the motor will run under
Question 3
A 3-phase alternator generates an open circuit phase voltage of 4000 V when exciting current is 50 A; the short-circuit current for the same excitation being 800 A. The synchronous reactance per phase is ……………… .
Question 4
Two single-phase ac motors A and B operate from a 1000 V supply. A consumes 2 kW at a power factor of 0.8 (lagging) and B consumes 1 kW at a power factor of 0.5 (lagging). The total current drawn from the supply is approximately
Question 5
If the centrifugal switch of a single-phase resistance split induction motor does not open after starting of motor, the motor
Question 6
Which of the following condition is NOT mandatory for alternators working in parallel?
Question 7
Low frequency operation of a.c. series motor in traction application:
Question 8
What is the efficiency of transformer compared with that of electrical motors of the same power?
Question 9
If K is the phase – to – phase voltage ratio, then the line-to-line voltage ratio in a 3-phase Y - Δ transformer is
Question 10
In an autotransformer of voltage ratio V1 > V2, the fraction of power transferred inductively is proportional to
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