A dc separately excited motor has constant field current. The armature – McqOptions

MCQOPTIONS

1.	A dc separately excited motor has constant field current. The armature is fed from a single phase supply through a full converter. When a = 0, speed is 500 rpm. If a = 45 , the speed is likely to be
A.	about 350 rpm
B.	about 250 rpm
C.	about 175 rpm
D.	about 125 rpm
Answer» E.

Discussion

No Comment Found

Related MCQs

Assertion (A): An ac regulator uses natural commutation Reason (R): An ac regulator can be used for static on load tap changing of transformer.
A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel
Assertion (A): A GTO can be turned on and turned off by gate pulses Reason (R): A GTO can be turned off by negative gate pulse.
Assertion (A): The turn on time of SCR is about 1 to 4 ms. Reason (R): The turn off time of SCR is about 10 to 300 ms.
In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.
Which of the following are included in the architecture of computer? 1.Addressing mode, design of CPU 2.Instruction set, data format 3.Secondary memory, operating system Select the correct answer using the codes given below:
In a single phase full wave ac regulator feeding R-L load, the gate pulses
In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current
Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V. Reason (R): When an SCR is conducting, the junction temperature is about 200 C.